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Copyright (c) Vitaly (Vit) Pozharov, 1994, 2002
Version 5.01 JavaScript
(more sophisticated versions of all programs may be available in Visual Basic, Excel, etc.)
This program calculates correlation between Y and X values (maximum 255 values each). It checks four (in this demonstration version) types of relations:
Linear  Exponential  Logarithmic  Power 
It also calculates the correlation coefficients (r) between the two data sets and standard deviation of the differences between actual and calculated y points (Syx) for each type or relationship. After calculations you may compare and select a model which gives the best approximation of your data (select the type with the largest r and smallest Syx). Just remember that r>0.5 generally means existence of significant correlation between X and Y. If r<0.5 then your probably have two independent data sets (or may be not). To start, enter (or better paste) X and Y data below and press <Submit> button. Enjoy! If you find bugs (I'm sure you do) or have any suggestions, please drop me a note.
Last Modified 08/15/02