weighted least squares regression definition weighted least squares regression on random data weighted least squares regression for random data weighted least squares regression weighted least square regression with random data what is t statistic in weighted least squares regression weighted least squares regression definition math weighted least squares definition weighted mean least squares regression weighted least squares regression with random data weighted least squares regression weighted least squares regression weighted least squares regression results weighted least squares regression with a random data weighted least squares regression definition weighted least squares regression weighted least squares regression definition weighted least squares regression definition weighted least squares regression wsr which statement describes the distribution of the statistics reported by r?