Add 2020/2025 school status norms and 2020 school growth norms#331
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Previously school norms used student norms as a proxy. Now uses actual school norm tables from NWEA publications.
Parsed from Appendix E of 2020 MAP Growth Normative Data report. Growth expectations are conditional on starting RIT score.
Add roxygen documentation and man pages for new data sets. Update README with norms availability table noting that 2025 detailed school growth norms are not published by NWEA.
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Summary
Background
School norms have tighter distributions than student norms because they represent averages. Previously, mapvizieR was using student norms as a proxy for school norms in 2020/2025. This PR adds the actual school norm tables.
Note: NWEA has not published detailed school conditional growth norms for 2025. The 2025 Technical Manual only provides aggregate growth statistics by grade, not the RIT-conditional tables needed for school growth percentile calculations.
New Data Sets
status_norms_2020status_norms_2025student_status_norms_2020_dense_extendedstudent_status_norms_2025_dense_extendedschool_status_norms_2020_dense_extendedschool_status_norms_2025_dense_extendedsch_growth_norms_2020Test Plan