r - proper form for sm.ancova -


i'm trying run non-parametric ancova tukey-kramer post hoc. suggested me sm.ancova info sheet on proc confusing. "group" function? have 4 sites measured on multiple years. year co-variate.

statistical questions i'm addressing: main effects: 1) slopes different? post-hoc: 2) sites different each other?

any appreciated! i'm lost thing.

current code not work:

   data1     library(sm)     attach(data1)     x<-year     x     y<-c(data1[,2:5])     y     as.vector(y)     sm.ancova(x,y,group=x) 

sm.ancova(year,data,site)

i believe group independent variable in case sites (or treatment group).

you need specify model equal or parallel.


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