
| Middle of category | Reverse Cummulative Frequency | Frequency % |
|---|---|---|
| 3.69 | 2979 | 100.0 |
| 3.79 | 2435 | 81.7 |
| 3.90 | 1535 | 51.5 |
| 4.00 | 1012 | 34.0 |
| 4.10 | 821 | 27.6 |
| 4.21 | 727 | 24.4 |
| 4.31 | 684 | 23.0 |
| 4.41 | 647 | 21.7 |
| 4.51 | 614 | 20.6 |
| 4.62 | 583 | 19.6 |
| 4.72 | 558 | 18.7 |
| 4.82 | 495 | 16.6 |
| 4.92 | 432 | 14.5 |
| 5.03 | 365 | 12.3 |
| 5.13 | 279 | 9.4 |
| 5.23 | 190 | 6.4 |
| 5.34 | 112 | 3.8 |
| 5.44 | 58 | 1.9 |
| 5.54 | 24 | 0.8 |
| 5.64 | 7 | 0.2 |
| 5.75 | 2 | 0.1 |
FYI: Regression on these (log-log) data points gives a line with slope of -2.58 and y-intercept of 17.83. The correlation coefficient is -0.890186093645903.
This program is a version of demo.cgi by Sanford Morton, heavily modified by Michael Grobe to include data input, categorization, and regression. The program uses Perl module Chart::Plot, written by Sanford Morton and downloaded from www.speakeasy.org, to draw plots.