13.56 The data file Britain Sick Leave shows data from Great Britain on the days of sick leave per person (Y), unemployment rate 1X12, ratio of benefits to earnings 1X22, and the real wage rate 1X32. Estimate the model log yt = b0 + b1 log x1t + b2 log x2t + b3log x3t + et and write a report on your findings. Include in your analysis a check on the possibility of autocorrelated errors and, if necessary, a correction for this problem.