I am fairly new at using R/programming in general so I apologize if I am
leaving crucial parts of the puzzle out, but here goes.



First and foremost this is the error I am receiving:



Error in muPriors[priors[, 1:2]] <- priors[, 3] :

  NAs are not allowed in subscripted assignments



This occurs only when I am using observational priors and some number of
nominal variables, it does not occur when I change to specifying the
variables as ordinal, or if I do not use priors. Using a doctored version of
the example from the Amelia User Guide this is what I came up with:



library(Amelia)

library(MatchIt)

library(Zelig)

library(foreign)



data(freetrade)



a.out = amelia(freetrade, m=5, ts = "year", cs = "country")


newtrade = which(is.na(freetrade), arr.ind = TRUE)

newtrade

newtradeMean =
c(30,29,28,31,32,34,30,34,26,32,30,29,28,31,32,34,30,34,26,32,30,29,28,31,32,34,30,34,26,

32,30,29,28,31,32,34,30,34,26,32,30,29,28,31,32,34,30,34,26,32,31,31,32,33,34,35,20,21,

7,8,2.0,2.1,2.2,2.0,2.5,2.3,2.5,2.1,1.9,1.8,1.7,2.9,2.0,0,0,1,.3,.4,.5,.3,.2,.3,.2,.4,.5,.3,.2,.3,.3,.4,.5,.3,.2,.3)

newishtrade = cbind(newtrade,newtradeMean)

newishtrade

newtradeSD =
c(5,5,5,4,3,3,2,4,5,4,5,5,5,4,3,3,2,4,5,4,5,5,5,4,3,3,2,4,5,4,5,5,5,4,3,3,2,4,5,4,5,5,5,4,3,3,2,4,5,4,3,4,5,6,4,3,4,2,

4,1,1.2,.3,.4,.3,.4,.3,.2,.3,.4,.3,.3,.3,.2,.3,.2,.3,.3,.1,.1,.2,.2,.3,.3,.1,.1,.2,.2,.3,.3,.1,.1,.2,.2,.3)

newishtrade = cbind(newtrade,newtradeMean, newtradeSD)

newishtrade



a.out = amelia(freetrade, m=5, ts = "year", cs = "country", priors =
newishtrade, p2s=2, noms="signed")



a.out = amelia(freetrade, m=5, ts = "year", cs = "country", priors =
newishtrade, p2s=2, ords="signed")




I followed the trail back through the source code to try and see what was
occurring. I learned some debugging techniques and tried to discern if it
was something with the code or perhaps some incorrect steps in using priors
with nominal variables. To summarize, I cannot get observational priors to
work when I specify nominal variables. If it helps below is my sourcing
output scattered through the various functions in the source code. Thoughts?


amelia starting
before prep
amelia.prep started
beginning prep functions
Variables used:  tariff polity pop gdp.pc intresmi fiveop usheg
noms.signed.2
after prep
running bootstrap
does this work
Error in muPriors[priors[, 1:2]] <- priors[, 3] :
  NAs are not allowed in subscripted assignments

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