### TODO list
### Updated 06/11/2020
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# High priority
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# ss ~ 0 leads to error 
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# Low priority
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# 1. Additional checks using testthat (comparison with car::Anova, weird situations, lmm)
# 2. VIF, collinearity (read Zappala et al.)
# 3. CompQuadForm F vs SS (just double check)
# 4. Proper function call using ::
# 5. Update docs (e.g. pv.ss)
# 6. Add help for class MLM
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# Very low priority
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# 1. Better "contrasts" argument and definition
# 2. Update example data
# 3. CompQuadForm precision limit
# 4. Report R2/r2? (other metrics?)
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# Notes
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# 1. Review lm, mvlm, mdmr, adonis, MDS
# 2. Profile: SST


