I have unstandadized B coeff.s in my parameter estimates for ANOVA. How can I use Beta=B(SDx/SDy) to convert them into standardized B's (Beta's).
Why doesn't SPSS do this for me, like it does in regression?
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First, in regression procedure SPSS (as many other software) actually first computes beta, because algorithm works with correlation matrix. It then computes b from beta by the formula you show (if you revert it).
Second, in ANOVA or general linear model procedure we usually deal with categorical predictors (factors) which are internally recoded into dummy or some other type of contrast variables. For such predictors, b is more valuable than beta because b is directly interpretable as difference in means (e.g. between specific groups). This is probably the reason why beta is not printed out.