bkw         - BKW collinearity diagnostics
bpagan      - Breusch-Pagan heteroscedasticity test
cusums      - Brown, Durbin, Evans cusums test
diagnose    - regression diagnostic statistics
dfbeta      - BKW influential observations diagnostics
plt_cus     - plot cusums test
plt_dfb     - plot dfbetas test
plt_dff     - plot dffits test
rdiag       - residual diagnostic plots
studentize  - standardization transformation

bkw_d       - demonstrates bkw 
bpagan_d    - demonstrates bpagan
cusums_d    - demonstrates cusums test
diagnose_d  - demonstrates diagnose 
dfbeta_d    - demonstrates dfbeta, plt_dfb, plt_dff 
rdiag_d     - demonstrates rdiagn 
 

ols.m        - used by diagnose, rdiag
fdis_prb.m   - used by waldf
chis_prb.m   - used by lmtest