Hi R experts,
I'm attempting to run Linear Discriminant Analysis using the lda function in
the MASS package. I've got around 50 predictor variables and one response
variable. My response variable has 5 numeric categories that represent
different clusters of fish abundance data (clusters were developed using
Bray-Curtis and NMDS), and my predictor variables are environmental variables
that might influence the fish data. These data all came from 68 sampling
locations.
I'm getting an error message:
>DALogFish<-lda(Cluster~DrainArea+Flow+StrmWidth+Gradient+NatComm+FishIBIUsed
+QHEI+QHEIsub+QHEImwh_h+QHEIcov+QHEIchan+QHEIrip+QHEIpool+QHEIrif+QHEIgrads+
QHEIgradv+QHEImwh+QHEIcovtype+QHEIwwh+QHab+QHabBuff+QHabEros+QhabPool+
QHabWDRatio+QHabRif+QHabFines+QHabCov+QHabRating+QHabSize+TP+TKN+NH3+NH3Min
+NO3NO2N+BOD+TSS+TSSMax+TDS+SSC+SSCMax+Chloride+Sulfate+Ecoli+ChlA+DOper+
DOperMin+DOperMin1_5+DOmgL+DOmgLMean+DOmgLMax+Cond+pH+pHMax+Trans+Temp+
TempMin+Temp4+Crop100+Crop500+CropSub+Dev100+Dev500+DevSub+For100+For500+
ForSub+Pas100+Pas500+PasSub+Wat100+Wat500+WatSub+Wet100+Wet500+WetSub+
Undev100+Undev500+UndevTotal+Undev100NoPas+Undev500NoPas+UndevTotNoPas,
data=AllData1, na.action="na.omit", CV=TRUE)
Error in lda.default(x, grouping, ...) :
variables 10 38 42 appear to be constant within groups
When I look at the variables listed, they don't appear "constant within the
groups" to me. I'm new to LDA and am wondering what this error means... Are my
data somehow not in the right format? Should I remove colinear variables? (All
variables have been normalized.)
Thanks very much!
Katie
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