Applied Statistical Methods - Notebook 2

Problem 1: Measurement Unit

The measurement unit has an influence on the results of a regression model. This is demonstrated by changing the unit for Breast Circumference (BC) from centimeters to meters.

Tasks

• Read the original dataset with BC and BW for 10 animals. The dataset is availble as csv-file under: https://charlotte-ngs.github.io/asmss2023/data/asm_bw_bc_reg.csv
• Convert all values of BC from centimeters to meters
• Run the regression model using lm()
• Compare the results with the results from the original model

Your Solution

• Use the function readr::read_csv() to read the data

• Divide all values in column Breast Circumference by 100

• Run the regression using lm()

• Comparison of results

Problem 2: Significance Level

Do the same type of comparison of regression modelling results when changing the measurement unit for the variable HEI in the complete dataset given in

https://charlotte-ngs.github.io/asmss2023/data/asm_bw_mult_reg.csv.

Tasks

• Run the same regression model as in Problem 1 of Exercise 1
• Convert the measurement unit for the variable HEI from centimeter to meter
• Compare the results of the two regression models with a special focus on the significance level

Your Solution

• The same regression model as in Problem 1 of Exercise 1

• Convert the values in column HEI from centimeter to meter

• Fit again a multiple regression model

• Compare the results

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Latest Changes: 2023-03-11 07:52:16 (pvr)