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Generalized Linear Models w/ Examples in R, Solution to Problem 3.14

Question 3.14 A study [15] of the effect of Manuka honey of the healing of wounds collected data from 20 wounds from 17 individuals (Table 3.9; data set: manuka). Plot the percentage reduction in wound size over 2 weeks against the initial pH. Fit the corresponding regression equation, and draw the regression line on the plot. Write down the regression model. Interpret the model. (This led to one of the main conclusions of the paper.) Later, a retraction notice was issued for the article [16] which stated that: The regression results presented. . . are strongly influenced by a high outlying value. . .When the results for this patient are omitted, the association is no longer statistically significant. . . As this relationship is pivotal to the conclusions of the paper, it is felt that the interests of patient care would be best served by a retraction. Perform a diagnostic analysis of the model fitted above. Identify the observation that is influential. Refit the regression model without this influential observation, and write down the model. Interpret the model, and compare to your interpretation of the previous model. Plot this regression line on the plot generated above. Compare the two regression lines, and comment. My Colab Answers: https://colab.research.google.com/dri... My Github: https://github.com/nicklausmillican