All tidying methods return a data.frame without rownames, whose
structure depends on the method chosen.
tidy returns the same information as
tidy.lm, though without confidence interval options.
glance
glance returns a one-row data frame with the following columns:
r.squaredR-squared
adj.r.squaredAdjusted R-squared
rhoSpearman's rho autocorrelation
number.interactionNumber of interactions
dw.originalDurbin-Watson statistic of original fit
p.value.originalP-value of original Durbin-Watson statistic
dw.transformedDurbin-Watson statistic of transformed fit
p.value.transformedP-value of autocorrelation after transformation