Part 1: Cross-Sectional Analysis
The data in the EViews file Injury_part1 contains a random sample of 7150 indemnity claims made in year 1984 from a group of insurance companies based in the states of Kentucky and Michigan in the USA. Each of the claims relates to work-related injuries and benefits (‘sick pay’) received while unable to work. In this part of the coursework you will investigate how policy changes affect the length of time (number of weeks) for which injured workers claimed benefits.
The dataset consists of information about the claims made in two USA states, which differ in terms of generosity of benefits. Specifically, although both Kentucky and Michigan had limits on the maximum amount of benefit which could be claimed, regardless of salary, for Kentucky the weekly limit was $131 and for Michigan the weekly limit was $181. The implication of these limits is that the loss of wages while injured would be greater for high earners (whose normal salary might exceed the limit) than for low earners. In 1984, both states changed their policy and raised the cap. Kentucky increased the maximum weekly benefit to $217, a 66% increase, and Michigan raised the maximum weekly benefit to $307, a 70% increase. There is a dummy variable in the data set (afchnge) which indicates whether a claim was made before or after the policy change. Specifically, it takes the value of 1 if benefits cap has changed and 0 otherwise.
The remaining variables in the dataset are as follows: durat = number of weeks claiming benefits ; highearn= variable which takes the value of 1 if someone is a high earner and 0 otherwise; male = variable which takes the value of 1 if someone is male and 0 otherwise; married = variable which takes the value of 1 if someone is married and 0 otherwise; hosp = variable which takes the value of 1 if someone’s injury required hospital in-patient treatment and 0 otherwise; age = age at time of injury; prewage = previous weekly wage; totmed = total yearly medical costs; ky = variable which takes the value of 1 for Kentucky and 0 otherwise; mi = variable which takes the value of 1 for Michigan and 0 otherwise; occdis = variable which takes the value of 1 if the illness is classified as an occupational disease and 0 otherwise, manuf = variable which takes the value of 1 if someone is employed in manufacturing industry and 0 otherwise, construc = variable which takes the value of 1 if someone is employed in construction industry and 0 otherwise. Note that all monetary variables are expressed in real terms, as of 1982.
The dataset contains also information about the type of injury sustained: head = 1 if someone experienced a head injury and 0 otherwise; neck = 1 if someone experienced a neck injury and 0 otherwise; upextr = 1 if upper extremities injury and 0 otherwise; trunk = 1 if the injury is to the trunk (torso); lowback = 1 if the injury is a lower back injury and 0 otherwise; lowextr = 1 if lower extremities injury and 0 otherwise. All other injuries are unclassified/general.
1) Preliminary data analysis.
a. Explain what factors may affect duration of benefit claims and why (you may go beyond what is included in the data set). Comment on expected correlations between these variables and the dependent variable (duration of weekly benefits).
b. Calculate the correlation coefficient between duration of benefits and the benefits policy change dummy. Is there a strong relationship between these two variables? Why or why not? Explain carefully
c. Propose a suitable regression model to explain how the reform affected the duration of benefit claims, accounting for any elements you consider important. Do not include quadratic and interaction terms at this stage. Present the exact equation and carefully justify your proposal.
d. Estimate the regression in part (c). Interpret each coefficient carefully. Do the coefficients on high earners and previous wages have a causal interpretation? Why or why not?
e. Conduct appropriate diagnostic tests for the regression in part (d).
f. Given the results in parts (d) and (e), suggest what adjustments can be made to the specification and wh
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