Compilation of fit information from published data dating back to 2006 from various online publications (click to enlarge):
Here is the latest chart; now based on a sample size of 140 points for saddle height and 138 points for reach. Saddle Height is as measured along the seat tube from the center of the bottom bracket to the top of the saddle, and Reach is measured in a direct line from the saddle tip to the center of the handlebars. The equations shown are for the best fit line, and the dashed lines represent plus/minus 3 cm. R-squared is the coefficient of determination as calculated by Excel. "RS" is the Spearman's rank correlation coefficient.