Variables are usually writen as lower-case letters.
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Usually, yes.
It is usually the regression coefficient: a measure of the degree to which two variables change in agreement with one another.
As written in lower case in this font (as waist), 2: the letters w and iIf written in upper case in this font (as WAIST), 4: the letters W, A, I and T
Not sure how the upper case and lower case letters interact. If that can be ignored then rj.Not sure how the upper case and lower case letters interact. If that can be ignored then rj.Not sure how the upper case and lower case letters interact. If that can be ignored then rj.Not sure how the upper case and lower case letters interact. If that can be ignored then rj.
In mathematics, a coefficient is a multiplicative factor in some term of an expression (or of a series); it is usually a number, but in any case does not involve any variables of the expression.