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From |
Craig Anderson <clanders@uci.edu> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: problem in ICE for multiple imputation |

Date |
Thu, 12 Jul 2007 22:07:25 -0700 |

a

In a complicated imputation, I found it helpful to check each regression separately before running ICE. If it's not obvious from 2- way tabs where the problem is, you could even run ologit or mlogit with one independent variable and then add one variable at a time to see which one is preventing convergence.

Craig

On Jul 11, 2007, at 11:00 PM, Maarten buis wrote:

--- tang5@purdue.edu wrote:Try combining some of the categories, like I virtualy always do when IA survey dataset has four variables q098 q099_2, q100 and 130 with a heavy amount of missing values for each of them. I ran the ice command and get the following message: "I detected a problem with running uvis with command mlogit on response q098 and covariates q099_2 q100 q130. The offending command resembled: uvis mlogit q098 q099_2 q100 q130 , With mlogit, try combining categories of q098, or if appropriate, use ologit unrecognized command r(199);" Then I use the option cmd(q098:ologit) since that variable could be an ordinal variable. I got the following message: "I detected a problem with running uvis with command ologit on response q098 and covariates q099_2 q100 q130. The offending command resembled: uvis ologit q098 q099_2 q100 q130 , unrecognized command"

use rep78 in my examples:

http://home.fsw.vu.nl/m.buis/stata/exampleFAQ.html#recode .

-mlogit- and -ologit- somtimes won't converge if one of categories is

very small. More seriously, the algorithm underlying -ice- (a Gibbs

sampler) won't converge if another variable or variables have all

missings for one value of q098. This is serious as -ice- will not and

cannot automatically check for convergance. I got the impression that

Patrick now checks for these problems and issues this warning message.

Hope this helps,

Maarten

-----------------------------------------

Maarten L. Buis

Department of Social Research Methodology

Vrije Universiteit Amsterdam

Boelelaan 1081

1081 HV Amsterdam

The Netherlands

visiting address:

Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

http://home.fsw.vu.nl/m.buis/

-----------------------------------------

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**References**:**Re: st: problem in ICE for multiple imputation***From:*Maarten buis <maartenbuis@yahoo.co.uk>

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