POLS 3650 Lecture Notes - Lecture 12: Null Hypothesis, Multivariate Analysis, Point Estimation
27 Feb 2017
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Overview: bivariate analysis, comparing two groups, comparing a sample to a population. Bivariate analysis: bivariate analysis explores the relationship between two variables, this entails to investigation of covariation as the values on one variable change, the values on the other variable change as well. If our variables have an ordinal level of measurement or higher, we can also specify direction. Positive as values on x increase, values on y increase. Negative as values on x increase, the values on y decrease: covariation does not mean causation, additional criteria: Comparing two groups: when we compare two groups, we explore the relationship between a dichotomous iv and a. If the dv is nominal or ordinal: compare proportions. If the dv is interval/ratio: compare means: we can express this comparison as, a difference ( 1- 2 or p1-p2, a ratio ( 1 or p1.
