'Independent error terms' presentation slideshows

Hypothesis tests for slopes in multiple linear regression model

1.04k views • 60 slides

Model Checking

Model Checking. Using residuals to check the validity of the linear regression model assumptions. The simple linear regression model. The mean of the responses, E(Y i ), is a l inear function of the x i . The errors, ? i , and hence the responses Y i , are i ndependent .

701 views • 47 slides

Model Checking

Model Checking. Using residuals to check the validity of the linear regression model assumptions. The simple linear regression model. The mean of the responses, E(Y i ), is a l inear function of the x i . The errors, ? i , and hence the responses Y i , are i ndependent .

738 views • 47 slides

Qualitative predictor variables

Qualitative predictor variables. Examples of qualitative predictor variables. Gender (male, female) Smoking status (smoker, nonsmoker) Socioeconomic status (poor, middle, rich). An example with one qualitative predictor. On average, do smoking mothers have babies with lower birth weight?.

887 views • 41 slides

Piecewise linear regression models

Piecewise linear regression models. Another use of interaction terms containing dummy variables. A plot demonstrating the need. The residuals versus fits plot demonstrating the need.

720 views • 7 slides