Analysis 6: linear regression (dataset v6)

1) Conduct descriptive analyses of all new variables in the dataset. How are the data distributed? What measures of central tendency are appropriate for each?

2) Evaluate the new variables that have been added summarizing workers’ exposures over the entire study period to the same variables which summarize exposures in a single workshift. What is the relationship between the study period and the individual workshifts that were assessed for each worker? Is a single workshift representative of a worker’s exposure over the duration of the study?

3) Is there a relationship between noise exposure level at the workshift level and the follow up period for each worker? In other words, are workers’ exposures at the workshift level positively or negatively correlated with their length of total follow-up?