Timeline for How to impute an ordinal variable with MICE but prevent it from taking one value?
Current License: CC BY-SA 4.0
12 events
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| S Feb 13, 2020 at 14:59 | history | suggested | dpel | CC BY-SA 4.0 |
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| Feb 13, 2020 at 12:10 | review | Suggested edits | |||
| S Feb 13, 2020 at 14:59 | |||||
| Apr 12, 2013 at 22:20 | answer | added | Stef van Buuren | timeline score: 11 | |
| Apr 12, 2013 at 12:24 | history | edited | Robert Long |
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| Jul 12, 2012 at 22:58 | comment | added | atiretoo | Sorry, I just realized there's a typo in my comment, should be tumor size == 0, so your response answers the question, thanks. In your additional code the reason why rows with overall_tumor_grade == NA are set to NA, is that any comparison with NA results in NA, not TRUE or FALSE. You can get around that by picking out the rows with tumor_size == 0, hence my botched question about the data above. | |
| Jul 12, 2012 at 20:42 | history | edited | JJM | CC BY-SA 3.0 |
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| Jul 12, 2012 at 20:08 | comment | added | JJM | @longrob all of the patients that have tumor sizes of 0 are already coded as grade 'X'. All of the missing overall_tumor_grade observations have tumor sizes >0, and the problem I'm having is that MICE is imputing some of those NAs as grade 'X'. | |
| Jul 12, 2012 at 19:38 | comment | added | Robert Long | @atiretoo I don't see why that assumption is needed ? If there are any observations with tumor_size==0 and overall_tumor_grade==NA just recode those NAs as X. Then delete observations with overall_tumor_grade==NA and run the imputations..... ? | |
| Jul 12, 2012 at 19:25 | comment | added | JJM | We cannot assume that because by definition grade 'X' means that the tumor size=0 | |
| Jul 12, 2012 at 18:01 | answer | added | Robert Long | timeline score: 7 | |
| Jul 12, 2012 at 18:00 | comment | added | atiretoo | Can we assume that all instances of overall_tumor_grade == 'X' also have tumor_size == 1? I think the answer might be to construct a data.frame without any rows with 'X', and then do the imputation on that, but that only works if the above assumption is true. | |
| Jul 12, 2012 at 16:43 | history | asked | JJM | CC BY-SA 3.0 |