DESCRIPTION: This extension allows you to conduct Simple and Multiple Linear Regression analyses for both tabular and grid data. This extension also gives you the ability to calculate a wider range of summary statistical data than the basic set provided by ESRI, and the power to generate probability values and critical values from a wide range of statistical distributions.
** Simple and Multiple Linear Regression on Themes and Tables: Calculate the linear relationship between an one or more independent Predictor variables and a dependent Response variable. Predictor and response values are drawn from fields in an ArcView table or a point/line/polygon theme feature attribute table.
** Simple and Multiple Linear Regression on Grids: Calculate the linear relationship between one or more predictor grids and a single response grid.
** Summary Statistics: From any numeric field in a table, calculate the mean, standard error of the mean, confidence intervals, minimum, 1st quartile, median, 3rd quartile, maximum, variance, standard deviation, average absolute deviation, skewness (normal and Fisher’s G1), kurtosis (normal and Fisher’s G2), number of records, number of null Values, and sum.
** Probability Calculators: Calculate the probability, cumulative probability and inverse probability (i.e. given a cumulative probability, calculate the corresponding critical value) of a wide range of statistical distributions, including the Beta, Binomial, Cauchy, Chi-Square, Exponential, F, Logistic, LogNormal, Normal, Poisson, Student’s T and Weibull distributions. This function is available as a general calculator that remains open until you are finished with it, or as a Table tool that performs the calculations on all selected records in a table.
REQUIRES: Spatial Analyst
REVISIONS: Version 3.1e (August 29, 2006): Corrects a bug which appears when you conduct grid regression and do not choose to calculate confidence bands or intervals, producing a message stating that ArcView cannot convert a string to a number. Also added functions to check the extension scripts for errors.
An on-line version of the documentation may be viewed at:
http://www.jennessent.com/arcview/regression.htm
Please visit Jenness Enterprises ArcView Extensions site for more ArcView Extensions and other software by the author.
http://www.jennessent.com/arcview/arcview_extensions.htm
Enjoy! Please contact the author if you have problems with this extension.
Jeff Jenness
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