【正文】
Unspecifieda. The model requires all nonmissing values to be positive.表2 Variable Processing SummaryVariablesDependentIndependent人均食品支出人均收入Number of Positive Values3131Number of Zeros00Number of Negative Values00Number of Missing ValuesUserMissing00SystemMissing00表3Case Processing SummaryNTotal Cases31Excluded Casesa0Forecasted Cases0Newly Cre