Asterisk (*) vs. colon (:) in R formulas [closed]
From help(formula):
In addition to ‘+’ and ‘:’, a number of other operators are useful in model formulae. The ‘*’ operator denotes factor crossing: ‘a*b’ interpreted as ‘a+b+a:b’.
From help(formula):
In addition to ‘+’ and ‘:’, a number of other operators are useful in model formulae. The ‘*’ operator denotes factor crossing: ‘a*b’ interpreted as ‘a+b+a:b’.