[R] std.error

[Bill.Venables at csiro.au]

"Standard error" usually means the estimated standard deviation of a parameter estimate, e.g. the sample mean.

Perhaps you mean the estimated standard deviation of the data.  If so

sdev <- sd(x, na.rm = TRUE)

If you want the standard error of the mean there are several ways of doing it.  Perhaps the simplest is

seMean <- sd(x, na.rm=TRUE)/sqrt(length(na.omit(x)))

missing values complicate the issue just a little.

Bill Venables.
________________________________________
From: r-help-bounces at r-project.org [r-help-bounces at r-project.org] On Behalf Of Mcdonald, Grant [grant.mcdonald08 at imperial.ac.uk]
Sent: 29 August 2009 04:50
To: r-help at R-project.org
Subject: [R] std.error

dear sir,

i am trying to calculate the standard error of my data (x),

i have tried se(x, na.rm=TRUE)
and std.error(x)

neither have worked and i cannot find an alternative


sorry to bother with such a basic problem
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