This statementspecifiesthe coefficients of the contrast and providesa label for output.
The ORDER=DATA option in the GLM statement guarantees that the first coefficient, 3,
corresponds to plastic (the first condition in the data set). The second coefficient, –1,
corresponds to vacuum, and so on. The results of this contrast test are the following:
ContrastDFContrast SSMean SquareF ValuePr > F
plastic vs. rest
1 9.985600009.9856000086.19<.0001
These resultssuggest that the plastic meanlog-bacterial count differsfrom the average of ...
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