Analysis 5: activities and other noise sources (dataset v5)

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 primary task variable (primarytaskshift). Does this create groups that are improved compared to what your previous group-level analyses? In other words, is there smaller within-group variance and larger between-group variance using task or the other groups you have explored?

3) Is there a relationship between the other noise source variable (othernearbynoiseshift) and the average (workleqdba) or maximum (lmaxdbashift₎ noise exposure variables?

4) Describe how you could develop one or more annual measures of exposure for the individuals in the dataset (keeping in mind that exposure is a combination of frequency of exposure, duration of exposure, and intensity of exposure). Hint: there are approximately 250 working days in a year).

5) Note that repeated measurement data have been found and added to the dataset.  Summarize the additional data and the effect of these additional data on your previous analyses, and describe how best to summarize the data - at the workshift level, at the level of individual, or both.  Also, report what fraction of the dataset is repeated measurements, and how many subjects have repeated measurements.