Hello R-help
(sorry if this message gets posted twice, i think I may have accidently
postponed it)
I donât know how to interpret significance from the contr.poly() function .
From
the example below
: how can I tell if data has a significant Linear/quadratic/cubic trend?
> contr.poly(4, c(1,2,4,8))
             .L        .Q         .C
[1,] -0.51287764Â 0.5296271 -0.45436947
[2,] -0.32637668 -0.1059254Â 0.79514657
[3,]Â 0.04662524 -0.7679594 -0.39757328
[4,]Â 0.79262909Â 0.3442576Â 0.05679618
>
> diff(contr.poly(4, c(1,2,4,8))[,1])
[1] 0.1865010 0.3730019 0.7460038
Thanks
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