SU PHE5020 2021 July Week 4 Discussion Latest

PHE5020 Biostatistical Methods

Week 4 Discussion

Coefficient of Determination

The purpose of this assignment is to learn about the coefficient of determination (R2) statistic as a measure of the fit of a regression line.

R2 is a statistical measure of how close the data are to a fitted regression line. In general, the higher the R2, the better the model fits your data. However, while R2 measures goodness of fit, it does not indicate whether a regression model is adequate. You can have a low R2 value for a good model or a high R2 value for a model that does not fit the data.

Using the South University Online Library, the Internet, and your text readings, research about R2.

On the basis of your research and your involvement in public health functions, respond to the following:

Find and state a definition of R2 that you feel is easy to understand.

In your own words, provide a substantive explanation of what R2 represents.

Explain what the statistic R2 is used for in regression analysis.

Explain how R2 is affected by sample size.

Describe whether a large R2 value means that a regression is significant. Provide reasons for your answer.

Describe how you would substantively interpret R2.

Submission Details:

Post your response to the Discussion Area by the due date assigned. Respond to at least two posts by the end of the week.