Week_13_Regression_rev_4_19_08

# Week_13_Regression_rev_4_19_08 - Concepts you should know...

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Concepts you should know: Bivariate regression Multivariate regression Control variables Regression coefficient (or β ) Null and alternative hypotheses for regression Regression “model” Adjusted R 2 F ratio in regression output Reporting regression results ScWk 242 Week 12 Regression, Rev 4/19/08 1

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Name that Statistic: To answer the following questions, which statistical procedure would you choose? Does a group case management intervention result in fewer overall costs than an individual case management intervention? (______) For decisions about those eligible vs. not eligible for SSI (Supplemental Social Security Income), does ethnicity of applicant matter? (______) For caseworkers in a child welfare agency, is there a relationship between average caseload size and the number of families that reunify in a two year period? (______) What effect does the initial motivation for treatment have on improvement in a depression scale, controlling for age, gender, and seriousness of initial symptoms? (multivariate regression ) 2 ScWk 242 Week 12 Regression
What is “regression”? It’s a form of correlation analysis. It can be either bivariate or multivariate. Bivariate: It predicts the value of a dependent (or outcome) variable from an observed independent (or predictor) variable Multivariate: It predicts the value of a dependent (or outcome) variable from an observed independent (or predictor) variable, controlling for other variables 3 ScWk 242 Week 12 Regression

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What does “controlling for” mean? Controlling for a variable (e.g. gender) means 1. We collect data on that variable 2. We include that variable in the list of independent variables in our model 3. The regression analysis separates out the effects of each
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Week_13_Regression_rev_4_19_08 - Concepts you should know...

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