I am unsure what i represents in the following equation for a multinomial logistic regression, the parentheses represent subscripts:

z(ik) = b(k0)+b(k1)x(i1)+b(k2)x(i2)+...+b(kj)x(ij)

z - dependent variable
k - number of categories
j - number of regression coefficients
b - regression coefficient
b(k0) - intercept

Thanks a lot.

I appreciate any help.

Cheers.