Hello,

I'm getting the following error when I try to use moPrep with a proxy:

Error in `[.data.frame`(mf, , proxyname) : undefined columns selected

I've never used moPrep successfully with a proxy, nor could I find any example code that uses a proxy, so there is a really good chance I'm just specifying something wrong. Here is an example using the africa data provided with the package. moPrep works well without a proxy, but with "civlib" specified as a proxy, specified as it seems most natural to me, the command fails.

data(africa)
m.out <- moPrep(africa, trade ~ trade, error.proportion = 0.1)
exists("m.out")

[1] TRUE

m.out.with.proxy <- moPrep(africa, trade ~ trade | civlib, error.proportion = 0.1)

Error in `[.data.frame`(mf, , proxyname) : undefined columns selected

exists("m.out.with.proxy")

[1] FALSE

I'm using Amelia 1.6.1 on R 2.15.0, platform: x86_64-pc-mingw32/x64 (64-bit).

Any help or pointers is appreciated.

Thanks so much,

Joe Dieleman

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