I'm new to R and am trying to extract the factors of a dataframe using numeric
indices (e.g. df[1]) that are input to a function definition instead of the
other types of references (e.g. df$out). df[1] is a list(?) whose class is
"dataframe". These indexed lists can be printed successfuly but are not
agreeable to the plot() and lm() functions shown below as are their df$out
references. Reading the documentation for plot and lm hasn't helped yet.
Thanks in advance - Stan.
> df=data.frame(out=1:4*3,pred1=1:4,pred2=1:4*2)
> regression=function(tble,a,b)
+ {
+ plot.new()
+ plot(tble[a]~tble[b])
+ lmm=lm(tble[a]~tble[b])
+ abline(lmm)
+ anova(lmm)
+ }
> df[1]
out
1 3
2 6
3 9
4 12
> df
out pred1 pred2
1 3 1 2
2 6 2 4
3 9 3 6
4 12 4 8
> regression(df,1,3)
Error in model.frame(formula, rownames, variables, varnames, extras,
extranames, :
invalid type (list) for variable 'tble[a]'
>
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