[R-sig-eco] correlation
Mahnaz Rabbaniha
rab.mahnaz at gmail.com
Sun Jan 8 17:41:47 CET 2012
Dear r-sig-ecology group,
>
> I am trying to find correlation between two variables. whereas they are non-normal used Spearman in this way:
> cor.test(SiO4,density,method="spearman")
Spearman's rank correlation rho
data: SiO4 and density
S = 5263.445, p-value = 0.1184
alternative hypothesis: true rho is not equal to 0
sample estimates:
rho
-0.296415
> plot(SiO4, density)
but i cant draw the line and in others same files, the problem is same
and what is meaning this message:
library (graphics)
> abline(density~SiO4)
Error in int_abline(a = a, b = b, h = h, v = v, untf = untf, ...) :
plot.new has not been called yet
.
>
> Many thanks in advance,
> mahnaz
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