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    Standard deviation

    I just read this in an addiction paper "The mean total amount of methamphetamine consumed over this 30-day period among those who used any was 0.21 g (SD=0.30) per using day" Because the SD is greater than the mean, can I assume that the distribution was positively skewed?
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    Hierarchical multiple regression - total variance

    What is the total variance accounted for in a Hierarchical model? Is the total variance accounted for the maxium F Change result? EG: In total, x1 and x2 accounted for 38.1% of the variance in y. R2 =0.38, F(2,997) =.323.39, p<.001 or is the total variance treated like a normal multiple...