Hi Group,
I need to repeat an analysis that was conducted on a smaller dataset,
but after looking at the previous statistician's methods, I'm a little
confused at why she chose to use ANCOVA. Any insight would be
appreciated!
Response Variable: Scores on 36 different Tests
Main Predictor of Interest is Treatment Type (1 or 2)
Data was collected from different individuals in each treatment group.
What she did:
1. Chi-square tests between Treatment Type and Clinical/Demographic
Factors (i.e. Race, ***, Age) and identified 3 significant variables.
2. ANCOVA analyses for each continuous test score (36 separate
ANCOVAs) to identify significant differences between patients in
Treatment 1 vs. Treatment 2, while controlling for 3 categorical
demographic variables.
I don't have that much experience in ANCOVA, but I thought this is
used to control for continuous "covariates", or does it apply to
categorical ones too? Would a multiple linear regression in this case
be enough to control for the significant categorical variables
identified by the chi-square analyses?
Thanks very much,
Jean
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