calculating std err (SEM)? - R-help

Fri, Mar 1, 2002 7:15 AM #

Is there a "canned" function in R for finding the standard error of the
mean? I have tried

+  SEM = stdev(x)/sqrt(length(x)))

Error in sem(pnet.lai) : couldn't find function "stdev"


It looks like there is no stdev function in R

Thanks,

Kirk



Kirk R. Wythers				email: kwythers at umn.edu
University of Minnesota			tel: 612.625.2261
Department of Forest Resources		fax: 612.625.5212
Saint Paul, MN 55108
					

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Peter Dalgaard

Fri, Mar 1, 2002 7:44 AM #

"Kirk R. Wythers" <kwythers at umn.edu> writes:

It's sd() (as help.search("deviation") might have told you). Also,
beware of missing values:  sd(x,na.rm=TRUE)/sum(!is.na(x)) is the sure
kill.

O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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Andrew Perrin

Fri, Mar 1, 2002 8:49 AM #

try sd(x)

ap

----------------------------------------------------------------------
Andrew J Perrin - andrew_perrin at unc.edu - http://www.unc.edu/~aperrin
 Assistant Professor of Sociology, U of North Carolina, Chapel Hill
      269 Hamilton Hall, CB#3210, Chapel Hill, NC 27599-3210 USA

On 1 Mar 2002, Kirk R. Wythers wrote:

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JRG

Fri, Mar 1, 2002 9:18 AM #

On 1 Mar 02, at 16:44, Peter Dalgaard BSA wrote:

Would that perhaps be  sd(x,na.rm=TRUE)/sqrt(sum(!is.na(x))) ?

---JRG


John R. Gleason

Syracuse University
430 Huntington Hall                      Voice:   315-443-3107
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Peter Dalgaard

Fri, Mar 1, 2002 11:01 AM #

"JRG" <loesljrg at accucom.net> writes:

Um. Yes.

On the other hand, I didn't say *what* it killed, did I? ;-)

        -p

O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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