
| ln( Box width ) | ln( RMS Fluctuation ) |
| 0.60 | -0.78 |
| 0.70 | -0.72 |
| 0.78 | -0.62 |
| 0.85 | -0.54 |
| 0.90 | -0.47 |
| 0.95 | -0.44 |
| 1.00 | -0.37 |
| 1.04 | -0.33 |
| 1.08 | -0.32 |
| 1.11 | -0.26 |
| 1.18 | -0.21 |
| 1.20 | -0.21 |
| 1.23 | -0.14 |
| 1.28 | -0.15 |
| 1.32 | -0.08 |
| 1.36 | -0.07 |
| 1.40 | -0.02 |
| 1.43 | 0.02 |
| 1.46 | 0.01 |
| 1.51 | 0.03 |
| 1.54 | 0.09 |
| 1.58 | 0.08 |
| 1.61 | 0.08 |
| 1.65 | 0.14 |
| 1.69 | 0.19 |
| 1.73 | 0.20 |
| 1.77 | 0.21 |
| 1.81 | 0.27 |
| 1.85 | 0.22 |
| 1.88 | 0.30 |
| 1.92 | 0.38 |
| 1.96 | 0.39 |
| 2.00 | 0.42 |
| 2.03 | 0.50 |
| 2.07 | 0.51 |
| 2.11 | 0.52 |
| 2.15 | 0.60 |
| 2.18 | 0.65 |
| 2.22 | 0.69 |
| 2.26 | 0.77 |
| 2.29 | 0.78 |
| 2.33 | 0.81 |
| 2.37 | 0.87 |
| 2.41 | 0.95 |
| 2.45 | 0.93 |
| 2.48 | 1.00 |
| 2.52 | 1.03 |
| 2.56 | 1.03 |
| 2.60 | 0.99 |
| 2.63 | 1.15 |
| 2.67 | 1.11 |
FYI: Regression on these DFA data points gives a line with slope of 0.90 and y-intercept of -1.32. The correlation coefficient is 0.995850433331745.
The slope values may be interpreted as follows:
| Slope | Interpretation |
|---|---|
| .5 | Totally random sequence; no self-similarity |
| 1.0 | Power-law (1/f) sequence; self-similarity at many scales |
| 1.5 | Brownian motion (random walk) |
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.