RE: [amelia] Amelia error message

Matt-- Many thanks... The problem was indeed exactly as you said... (The program I'm working with deletes all IVs that have only NAs... But a later step created some more-- which I then tried to pass to Amelia...) Anyway, I modified my program, and Amelia now accepts my data with no complaint... Thanks again!... Wayne -----Original Message----- From: Matt Blackwell [mailto:mblackwell@iq.harvard.edu] Sent: Thursday, August 27, 2009 11:37 To: Wayne Thornton Cc: amelia(a)lists.gking.harvard.edu Subject: Re: [amelia] Amelia error message Hi Wayne, After taking a look at your data, it looks like you have about 50 or so variables that don't vary all marked as "nominals." You'll have to put those variables into the idvars argument to keep them out of the imputations. Here is the code I used to find the problematic variables, along with their column numbers, for your reference. [1] 44 46 47 48 49 52 53 54 55 56 61 62 105 141 146 148 151 165 172 [20] 174 179 239 244 245 246 247 248 249 250 251 253 254 257 259 260 269 270 271 [39] 275 278 283 285 287 288 289 290 302 303 304 309 One more thing you should consider is that you will probably not be able to impute 600+ variables with only 1000 observations. Remember that if p is the number of variables, then Amelia has to estimate roughly p^2/2 parameters. I hope this helps, matt. On Wed, Aug 26, 2009 at 12:09 AM, Wayne Thornton&lt;thornton(a)fas.harvard.edu&gt; wrote: noms <http://1429236.signature1.mailinfo.com/confirm2.6/04060100/0003014E/07030B4 5/0025239207.jpg>