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This page contains results for three different corpora:
- Standard Calgary Corpus (14 files) from Ian Witten, Tim Bell and John Cleary,
- Standard Canterbury Corpus (11 files) and
- Large Canterbury Corpus (3 files) from Ross Arnold and Tim Bell.
In contrast to many other comparison pages the presented results are based on compression of single files and not on an archives of files. If you are looking for results of archives looked at the excellent ACT site of Jeff Gilchrist.
Here the average compression rate (average of all single compression rates) is listed. The compression rate is measured in bits per symbol (bps) as the quotient of the size of the output in bits to the size of the input in bytes. A value of 8 bps means no compression, smaller values represent better (stronger) compression.
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Compression and Decompression Times
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In order to compare the speed of compression and decompression of the programs, all times are measured in seconds on the same computer. The computer has an Intel Pentium III processor with 735 MHz, running under WINDOWS 2000.
For comparison reason the time tables contain also the average compression rate and the total (weighted) compression rate (total sum of the output bit size to total sum of the input byte size).
All programs listed here have published their algorithms either by papers or by source code. For more information follow the links of the programs.
The Calgary Corpus
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Compression Rates / bps for the Calgary Corpus (14 files) sorted by Average
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Program
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bib
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book1
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book2
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geo
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news
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obj1
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obj2
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paper1
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paper2
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pic
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progc
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progl
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progp
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trans
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Average
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ABC02
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1.888
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2.226
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1.929
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4.190
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2.399
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3.733
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2.365
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2.382
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2.332
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0.706
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2.420
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1.659
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1.659
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1.440
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2.238
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B00
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1.901
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2.257
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1.950
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4.156
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2.393
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3.739
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2.410
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2.394
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2.335
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0.720
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2.439
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1.652
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1.630
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1.427
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2.243
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D00
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1.896
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2.274
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1.958
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4.152
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2.409
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3.695
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2.414
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2.403
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2.347
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0.717
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2.431
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1.670
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1.672
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1.452
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2.249
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YBS02
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1.915
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2.218
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1.921
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4.487
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2.385
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3.919
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2.444
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2.372
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2.313
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0.710
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2.438
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1.674
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1.684
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1.467
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2.282
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F02
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1.927
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2.357
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2.014
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4.428
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2.465
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3.798
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2.433
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2.441
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2.389
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0.753
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2.479
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1.698
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1.703
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1.489
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2.312
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BAR
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2.059
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2.558
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2.171
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4.878
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2.608
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4.161
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2.550
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2.592
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2.553
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0.847
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2.629
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1.818
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1.808
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1.554
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2.485
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GZIP93
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2.516
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3.256
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2.702
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5.355
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3.072
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3.839
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2.628
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2.792
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2.880
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0.816
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2.679
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1.807
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1.812
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1.611
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2.698
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Compression and Decompression Times / sec and Average and Total Compression Rates / bps
for the Calgary Corpus (14 files) sorted by Sum
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Program
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Total Compression
Time
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Total Decompression
Time
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Sum of Compr. and
Decompr. Time
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Average Compression
Rate
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Total Compression
Rate
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GZIP93
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2.64
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0.86
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3.50
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2.698
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2.595
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YBS02
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2.66
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1.62
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4.28
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2.282
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1.991
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ABC02
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6.06
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5.67
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11.73
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2.238
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1.977
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F02
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14.30
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4.96
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19.26
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2.312
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2.062
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The Canterbury Corpus
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Compression Rates / bps for the Canterbury Corpus (11 files) sorted by Average
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Program
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alice29.
txt
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asyoulik.
txt
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cp.
html
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fields.
c
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grammar.
lsp
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kennedy.
xls
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lcet10.
txt
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plrabn12.
txt
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ptt5
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sum
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xargs.
1
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Average
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B00
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2.158
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2.415
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2.348
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2.056
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2.535
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0.616
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1.902
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2.293
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0.720
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2.537
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3.085
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2.060
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ABC02
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2.160
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2.419
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2.359
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2.078
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2.505
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1.058
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1.888
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2.249
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0.706
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2.486
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3.074
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2.089
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YBS02
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2.127
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2.381
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2.461
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2.134
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2.647
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0.895
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1.870
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2.236
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0.710
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2.626
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3.174
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2.115
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F02
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2.228
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2.483
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2.410
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2.097
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2.548
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1.243
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1.968
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2.361
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0.753
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2.572
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3.098
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2.160
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BAR
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2.379
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2.666
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2.580
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2.323
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3.031
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1.449
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2.133
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2.562
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0.847
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2.862
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3.541
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2.398
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GZIP93
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2.849
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3.118
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2.594
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2.249
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2.670
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1.579
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2.704
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3.229
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0.816
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2.672
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3.320
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2.527
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Compression and Decompression Times / sec and Average and Total Compression Rates / bps
for the Canterbury Corpus (11 files) sorted by Sum
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Program
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Total Compression
Time
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Total Decompression
Time
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Sum of Compr. and
Decompr. Time
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Average Compression
Rate
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Total Compression
Rate
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YBS02
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2.34
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1.33
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3.67
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2.115
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1.420
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GZIP93
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4.87
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0.69
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5.56
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2.527
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2.061
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ABC02
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3.79
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3.34
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7.13
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2.089
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1.484
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F02
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14.67
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4.11
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18.78
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2.160
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1.600
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Compression Rates / bps for the Large Canterbury Corpus (3 files) sorted by Average
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Program
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bible.txt
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e.coli
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world192.txt
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Average
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ABC02
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1.451
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1.954
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1.306
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1.570
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B00
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1.480
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1.918
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1.334
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1.577
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YBS02
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1.488
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1.983
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1.394
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1.622
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F02
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1.533
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2.023
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1.353
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1.636
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BAR
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1.753
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2.092
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1.623
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1.823
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GZIP93
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2.330
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2.244
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2.337
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2.304
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Compression and Decompression Times / sec and Average and Total Compression Rates / bps
for the Large Canterbury Corpus (3 files) sorted by Sum
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Program
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Total Compression
Time
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Total Decompression
Time
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Sum of Compr. and
Decompr. Time
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Average Compression
Rate
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Total Compression
Rate
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YBS02
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11.94
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6.24
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18.18
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1.622
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1.673
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GZIP93
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20.62
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2.64
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23.26
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2.304
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2.296
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ABC02
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19.71
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12.15
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31.86
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1.570
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1.628
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F02
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96.35
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19.65
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116.00
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1.636
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1.697
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