My sampling unit is STUDENT, which in the population has the following strata: SCHOOL, GRADE (4 levels), and WRITING_SCORE (4 levels).
I want to draw an SRS from the population. However SCHOOL is not a stratum in the sample. The sample strata are: GRADE and WRITING_SCORE.
How can I use SURVEYSELECT to draw an SRS that enforces the constraint that no more than 5 students are selected from the same SCHOOL?