[R] Error running LDA

[Prof Brian Ripley]

As it says, some of your variables appear not to vary, which means LDA is 
not appropriate.  LDA assumes a common multivariate normal distribution 
for the variation of each group about the group centre, and that cannot 
generate data like yours.

On Fri, 19 Dec 2003, Yun-Fang Juan wrote:

> oh sorry
> here is the error.
> Please advice.
> 
> thanks,
> 
> Yun-Fang
> 
> > lda1 <- lda(retention ~ . , data=RetentionDF40[1:10000,]);
> Error in lda.default(x, grouping, ...) : variable(s)  11  14  24  29  30  31
> 32  33  34  35  41  43  44  47  48  49  50  51  54  55  56  57  58  59  60
> 61  65  66  67  68  70  71  72  74  78  82  85  87  88  89  91  92  93 101
> 102 103 107 108 109 111 112 117 122 124 125 127 148 151 153 155 156 162 170
> 173 176 181 182 183 184 186 189 190 192 193 194 196 200 209 212 213 214 215
> 216 218 220 222 223 224 228 230 231 234 235 236 237 appear to be constant
> within groups
> 
> ----- Original Message -----
> From: "Marc R. Feldesman" <feldesmanm at pdx.edu>
> To: "Yun-Fang Juan" <yunfang at yahoo-inc.com>; <r-help at stat.math.ethz.ch>
> Sent: Friday, December 19, 2003 6:38 PM
> Subject: Re: [R] Error running LDA
> 
> 
> > At 06:13 PM 12/19/2003, Yun-Fang Juan wrote:
> >  >Hi,
> >  >I try to run the linear discriminant analysis using the following
> command
> >  >but got an error like the following.
> >  >lda1 <- lda(retention ~ . , data=RetentionDF40[1:10000,]);
> >  >
> >
> > What error did you get?  Did you read the help file for lda?  What version
> > of R and what version of VR are you using?  What platform?
> >
> >
> 
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> 
> 

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595