Re: [R] Normality tests

From: Jorge Ivan Velez <jorgeivanvelez_at_gmail.com>
Date: Tue, 26 Apr 2011 16:52:54 -0400

Hi Bruce,

One way is via apply()

# some data
set.seed(123)
X <- matrix(rnorm(100), ncol = 5)
X

# tests
t(apply(X, 2, function(x){

            sw <- shapiro.test(x)
            c(sw$statistic, P = sw$p.value)
            }))

See ?apply and ?str and ?shapiro.test for more information.

HTH,
Jorge

On Tue, Apr 26, 2011 at 4:15 PM, Bruce Kindseth <> wrote:

> I have a large amount of data which I break down into a collection of
> vectors of 100-125 values each. I would like to test the normality of the
> vectors and compare them. In the interactive mode I can test any one
> vector
> using the Shapiro-Wilk test or the Kolmogorov-Smirnov test. My problem is
> that when I try to write out the results to a file, the term output is a
> mixture of alpha characters along with the number value that I really want.
> How can I get it to write out just the p-values by themselves?
>
> Thank you very much for your time.
>
> Bruce Kindseth
>
>
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>
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