Department of Statistics and Actuarial Science, Simon Fraser University Burnaby, Canada V5A 1S6. jgraham@stat.sfu.ca|Department of Statistics and Actuarial Science, Simon Fraser University Burnaby, Canada V5A 1S6. jgraham@stat.sfu.ca|Department of Statistics and Actuarial Science, Simon Fraser University Burnaby, Canada V5A 1S6. jgraham@stat.sfu.ca