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Replace NA or impute with some value

http://www.heritagehealthprize.com/c/hhp/forums/t/666/contribute-an-r-function?limit=all

http://stackoverflow.com/questions/8161836/how-do-i-replace-na-values-with-zeros-in-r

http://stackoverflow.com/questions/7235657/fastest-way-to-replace-nas-in-a-large-data-table

http://r.789695.n4.nabble.com/How-to-replace-all-lt-NA-gt-values-in-a-data-frame-with-another-not-0-value-td2125458.html

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