just fill long lines
take a pass through
split polynomial/orthogonality to dim reduc
swap in new questions, already in use
add Gelman link on model assumptions
split out poly details from lm.Rmd
add some about collinearity again
put into proper Rmd format
add clever thing from Mike

which is the OLS solution of linear regression coefficients
switch to new fabricated data exercise
Merge pull request #183 from ajschumacher/update_lm

update lm: 09-linear_R