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ot2010
2010 Oct 14
1
Regression with groups and nested sub-groups
I have the following formula for a linear model:
z <- lm(y~x + factor(a) + factor(b), data=NT2010)
where a (groups) and b (Sub-groups) are categorical variables (factors), x
is a continuous covariate, and y the response variable. Since b is nested
within a, the formula can also be written as:
z <- lm(y~x + factor(a) + factor(a)/factor(b), data=NT2010)
and the same output is achieved whe...