If you specify METHOD=RANDOM in the IMPUTE statement, PROC HPIMPUTE replaces missing values with a random value that is drawn
between the minimum and maximum of the variable. For variable x, assume that the data set is {}, where
. Let
, and let
. The random value
, where
is a function that takes a SEED (number) as input and returns a random value from a uniform distribution between 0 and 1.
When PROC IMPUTE runs in single-machine mode and uses a single thread, the SEED is set to 5. When PROC IMPUTE runs in distributed
execution mode or uses multiple threads, the SEED is determined at run time.