PSYC 51a Lecture Notes - Lecture 16: Squared Deviations From The Mean, Univariate, 3 Lbs
29 Apr 2017
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The order of association does not matter. One statistics (r) combines slope and scatter. Order of the two variables does not matter r statistics is independent of the scale of the variables. Predict exact value of one variable y from other variable x. Three statistics (b, a and sy. x) quantify slope (b), y-intercept (a), and scatter (sy. x), separately. Regression statistics are dependent on the scale of variables. Univariate statistics don"t indicate anything except that the groups don"t differ. Mean differences (not all scores taken into consideration). Each statistic (mean and sd) summarizes information about just one variable. Need a summary statistic that is computed using information from two variables. Correlation: x variable is positively/negatively correlated with y variable. The general form of a predictive equation for a straight line relationship is: (weight loss with therapy) = b(weight loss with no drug) + a. Estimate of dependent variable (values predicted by the line equation)
