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Free Downloadable Files: The following files have been
developed over the years for a variety of reasons. They are grouped
by category, and a
brief description follows each file. Caution! These files are worksinprogress. They have been
checked for accuracy, but errors might still exist. As a result, use them at your own
risk. 
Contrast Calculator (testing_contrasts.xls) – This ExcelÒ spreadsheet uses treatment means, the pooled standard error of the means, and the number of observations per treatment to test the significance of userdefined singledegreeoffreedom contrasts. Completely random or randomized complete block designs with up to six treatments may be evaluated, and the program also checks for orthogonality of the contrasts. 
Orthogonal Coefficient Calculator (unequal_orthog.xls) – This ExcelÒ spreadsheet can be used to calculate coefficients for orthogonal contrasts for independent variables with up to five levels (e.g., linear, quadratic, cubic, and quartic), regardless or whether the levels are equally or unequally spaced. 

Orthogonal Coefficients for Unequally Spaced Treatments (orthog.doc) – This Microsoft WordÒ file describes how to use Proc IML in SAS to calculate coefficients for orthogonal contrasts. This information can be used in lieu of the Orthogonal Coefficient Calculator when the levels of the independent variable exceed five. Examples of SAS code and output are included. 
Last Modified: 05/15/09 