After my previous post about missing data, Kathy asked on Twitter whether two wrong models (the imputation model + the outcome model) would be better than one (the outcome model alone). Without doing any of the math, I’d guess the assumption of correctly spec the model also has a bigger impact in the CC analysis. You need correct spec in MI, twice, but trade off that potential bias for higher prec. This is a great question! I am going to investigate via a small simulation (so the answer cou...|
Here is the scenario: You are trying to predict some outcome, , and some of your predictors have missing data. Will doing a complete case analysis give you unbiased results? What additional information do you need before deciding? For some reason, when I tried to answer this question, my first instinct was to try to decide whether the data were missing at random, but it turns out, this might not be the right first question! Why? Complete case analysis will give us unbiased estimates even if t...|