svymean w/ svyby is working for me...

> svyby(~visitcnt, ~agegrp3.f, svymean, design=svydes)
      agegrp3.f  visitcnt se.visitcnt
18-44     18-44  8.755552   0.4953235
45-64     45-64 10.131555   0.5347806
65+         65+  9.588802   0.4323629

svyquantile is working for me...

> svyquantile(~visitcnt, quantiles=c(.25, .5, .75), ties="rounded", design=svydes)
             0.25      0.5     0.75
visitcnt 3.021468 6.039823 11.49518

svyquantile w/ svyby is bombing on me...

> svyby(~visitcnt, ~agegrp3.f, svyquantile, quantiles=c(.25, .5, .75), ties="rounded", design=svydes)
Error in object$coefficients : $ operator is invalid for atomic vectors

i'm not sure what i'm missing/not understanding.

any help would be much appreciated. 

thanks,

marc zodet


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