If you have and IPAD/IPOD/TABLET or other device in bag that has WiFi what should you do when arriving at the exam venue?Single choice

A

Turn off WiFi on the device

B

Leave in bag outside the exam

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A researcher is analysing the time until job loss for a sample of workers. The following Cox proportional hazards model has been estimated: where •  Training = 1 if participated in job training, 0 otherwise •  Age = age of worker •  Union = 1 if union member, 0 otherwise (a) Explain the structure of this Cox proportional hazards model. What does the baseline hazard represent, and what does the proportional hazards assumption imply? [2] (b) Describe the partial likelihood estimation method for estimating the coefficients here. [4] (c) Calculate the hazard ratio for the following two individuals and interpret the result. Individual A: Age = 40, Training = 1, Union = 0 Individual B: Age = 40, Training = 0, Union = 0 [4][Fill in the blank]

You are given crude age-specific mortality rates for a population ranging from age 0 to age 90. The observed crude mortality curve shows high mortality in infancy, a decline in early childhood, and then a steep rise in older ages. To model this nonlinear pattern, a cubic spline is used to smooth the log mortality curve, with n = 3 knots at ages x1 = 1, x2 = 20, and x3 = 65: (a) Explain what a cubic spline is and why modelling the log of mortality rates with a spline is more appropriate than modelling mortality rates on the original scale. [3] (b) Given the parameter estimates , , , , , , and , calculate the log mortality rates at ages 0, 10, 30, 60, and 80 and plot the log mortality curve. Comment on the shape of the curve.[4] (c) Describe how you would evaluate the quality and appropriateness of the spline model. Include both a graphical method and a statistical test for model adequacy, and explain what signs might indicate overfitting or underfitting. [2] (d) Discuss one real-world scenario in which the cubic spline may perform poorly for a particular country. [1][Fill in the blank]

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Question text 2Marks You are given the following variance – covariance matrix on two shares and the market portfolio. Risk free rate is 6% per annum. Expected market return is 14% per annum. You have $500,000 available to invest. Assume that you are forming a portfolio by investing $200,000 in Share A, $200,000 in Share B and the balance of the $500,000 in risk free asset. What is the standard deviation of this portfolio in percentage terms? [Type only the final answer into the response box below (NOT into the Notes box) and in pure numeric format (e.g. 10 or -10). Do NOT use %/$ signs, commas or spaces (e.g. only enter 10 if it is 10 days/$10/10%)] Answer 1[input]Notes Report question issue Question 6 Notes

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