[gov2001-l] Simulation with multiply imputed data sets

Hi everyone, I have a quick question. I'm working with several multiply imputed data sets and would like to simulate quantities of interest at mean/mode values of explanatory variables. Because of the way I subset data iteratively in a for loop, I would like to consolidate the five data sets into a single data set, with each observation simply taking the mean (or, in some cases, mode) value of the five data cells from the imputed data sets. So my question: How can I coerce the five imputed data sets into a single data set with mean/mode values? There must be some straightforward way to do this. Thanks in advance for the help. Best, Brett