Regression variables that contain zeros are incorrectly centred. More precisely, the correct sample means are calculated but not removed from zero observations. As a consequence, zeros in the non-centred regression variable remain zeros in the centred regression variable.
Regression variables that contain zeros are incorrectly centred. More precisely, the correct sample means are calculated but not removed from zero observations. As a consequence, zeros in the non-centred regression variable remain zeros in the centred regression variable.