why do weighted models have r weighted regression how to do weighted regression effective sample size weighted model of regression weighted regression effect weighted regression definition weighted regression how to measure sample size when weighting a regression weighted regression definition in statistics what is the weighted regression used for? what is the weighted regression sample size weighted regression lm weighted regression r definition weighted regression r weighted regression effect on p value weighted regression how to use example weighted regression r definition weighted regression effective sample size how to calculate coefficient of freedom for a weighted regression weighted regression effective sample size