[R] Mardia's multivariate normality test

From: Jiao Yang <yj316_at_gwu.edu>
Date: Sun, 06 May 2007 21:00:40 -0400

Dear all,

I got this error message

> library(dprep)
> mardia(Savg)

Error in cov(data) : 'x' is empty

But with the same data, I got
> library(mvnormtest)
> mshapiro.test(Savg)

        Shapiro-Wilk normality test

data: Z
W = 0.9411, p-value = 0.6739

What does the error message "Error in cov(data) : 'x' is empty" mean? Thanks a lot!


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