PY 603 – Advanced Statistics II TR 12:30-1:45pm 232 Gordon Palmer Hall Jamie DeCoster

Introduction to Regression Travel survey Syllabus Prerequisites (PY 602 topics) Describing a data set Steps to perform a hypothesis test Hypothesis tests of a point estimate

Prerequisites (PY 602 topics) Knowledge of ANOVA Knowledge of SPSS Knowledge of Excel Knowledge of Word – equation editor

Describing a Data Set Data source vs. data set Cases Variables Unit of analysis Numeric vs. categorical variables

Steps to Describe a Data Set Provide a general description of the data set Describe the subject population Report the unit of analysis for the data set Name your variables Describe what the variable measures State the units of numeric variables or the groups for categorical variables

Steps to Perform a Hypothesis Test Determine null and alternative hypotheses Select a sample Collect data discriminating the hypotheses Compute a test statistic Determine the probability of getting the observed statistic if the null was true State whether you reject or fail to reject the null hypothesis

Hypothesis Test of a Point Estimate Tests whether an estimated value is significantly different from a constant Commonly performed in regression –Values of estimates –Slopes of regression lines General form

Reporting a Hypothesis Test of a Point Estimate State the null and alternative hypotheses Report the estimate Report the standard error of the estimate Report the df associated with the standard error Calculate the t statistic Report the p-value for the t State your conclusion