Contrast coding is used when one has a series of orthogonal contrasts or group comparisons that are to be investigated.
2.
Effects coding is used when one does not have a particular comparison or control group and does not have any planned orthogonal contrasts.
3.
Because orthogonal contrasts test different aspects of the data, they are independent, the results of one contrast has no effect on the results of the other contrasts.
4.
In a balanced one-way analysis of variance, using orthogonal contrasts has the advantage of completely partitioning the treatment sum of squares into non-overlapping additive components that represent the variation due to each contrast.
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