python 3.x - How to get rid of main effects when coding interaction between categorical variables in patsy? -

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i have problem similar :

interaction effects in patsy patsy.dmatrices giving duplicate columns ":" "+" , or "*"

except have other categorical variables besides interaction term. formula :

f = 'vardep ~ c(moisavantdep):c(groupe) + c(joursemdep) + c(moisdep) + jour_nuit'

when run ols regression in statsmodels formula, main effects variable "groupe", avoid. tried add -1 in formula (as suggested in above mentioned discussion), still main effects.

any suggestion ?


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