[R] interpret significance from the contr.poly() function

[Asan Ramzan]

Hello R-help
(sorry if this message gets posted twice, i think I may have accidently 
postponed it)
I don’t 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,] -0.51287764  0.5296271 -0.45436947
[2,] -0.32637668 -0.1059254  0.79514657
[3,]  0.04662524 -0.7679594 -0.39757328
[4,]  0.79262909  0.3442576  0.05679618
> 
> diff(contr.poly(4, c(1,2,4,8))[,1])
[1] 0.1865010 0.3730019 0.7460038
Thanks



      
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