NNET Procedure

If you specify a WEIGHT statement, variable identifies a numeric variable in the input data table that contains the weight to be placed on the prediction error (the difference between the output of the network and the target value specified in the input data table) for each observation during training.

If the variable is less than or equal to 0 or is missing, the observation is not used for training. When you perform scoring, PROC NNET scores the observation even if the weight is less than or equal to 0 or missing.

The WEIGHT statement is optional. If a WEIGHT statement is not included, all observations are assigned a weight of 1.