Using step() function for stepwise model selection
Use z-values instead of p-values as the importance
log(AADT)
Optimal beta coefficients of CV
Add coefficient without intercepts
A way to resolve the issue about beta's names
Beta.offset names
Attemp to redefine the importance standardization function
Change the apply function into "max" for z/t values and coefficient magnitute
Merge branch 'master' of https://github.com/kentwang/alabama_accident