Example dataframe for structrual zeros based on the ss16pusa_sample_zeros dataset. It contains 8 structural zero cases with 5 variables.
| [,1] | AGEP = 16 and SCHL = Bachelor's degree |
| [,2] | AGEP = 16 and SCHL = Doctorate degree |
| [,3] | AGEP = 16 and SCHL = Master's degree |
| [,4] | AGEP = 16 and SCHL = Professional degree |
| [,5] | AGEP = 17 and SCHL = Bachelor's degree |
| [,6] | AGEP = 17 and SCHL = Doctorate degree |
| [,7] | AGEP = 17 and SCHL = Master's degree |
| [,8] | AGEP = 17 and SCHL = Professional degree |