[R] PAN: Need Help for Multiple Imputation Package

[Uwe Ligges]

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Uwe Ligges



AC wrote:

> Hello all.  I am trying to run PAN, multilevel
> multiple imputation program, in R to impute missing
> data in a longitudinal dataset.  I could successfully
> run the multiple imputation when I only imputed one
> variable.  However, when I tried to impute a
> time-varying covariate as well as a response variable,
> I received an error message, “Error: subscript out of
> bounds.”  Can anyone tell if my commands contain any
> mistakes?
> 
> First I imported SAS dataset ‘sim’ which includes a
> response variable ‘MIY1’, a time-varying covariate
> ‘TCOV1’, TIME, GROUP (0 or 1), and ID.  200
> participants were included and measurement occurred
> six times.  Approximately 25% of participants dropped
> out at end.      
> 
> 
>>sim <- read.xport('c:\\xptds.dat')
>>
>>int <- rep(1,1200)
>>y <- cbind(sim$MIY1,sim$TCOV1)
>>subj <- sim$ID
>>pred <- cbind(int, sim$TIME, sim$GROUP)  
>>
>>xcol <- 1:3
>>zcol <- 1
> 
> 
>>prior <- list(a=2,Binv=4,c=2,Dinv=4)
> 
> 
>>result <-
> 
> pan(y,subj,pred,xcol,zcol,prior,seed=13579,iter=1000)
> Error: subscript out of bounds
> 
> 
> By the way, I also received the same error message
> when I tried to include intercept and time in Zcol, a
> matrix for random effect specification.  I used
> command “ zcol <- 1:2”.  Does anybody know if this
> error is due to sample size/proportion of missing data
> or due to command mistake?
> 
> I truly appreciate any feedbacks.
> Best regards,
> Eishi
> 
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