A6. Couret & Venter

Question 1

Formula to estimate true population mean injury type count ratios

Answer 1

vi est = Vh + bv,i (Vi-Vh) +cv,i (Wi-Wh) +dv,i(Xi-Xh) + ev,i (Yi-Yh)

Question 2

Cov(Vi,vi)

Answer 2

=VHMv
=max[ [summation of (mi(vi-vh)^2) - (R-1)EPV]/ [mh - (1/mh) summation of (mi^2)] , 0]

Question 3

EPVv formula

Answer 3

summation of (mi,t (Vi,t - Vi)^2)) / (R(n-1))

Question 4

var(vi)

Answer 4

=EPV / mi + VHM

Question 5

cov(vi,wi)

Answer 5

summation of [(Vi-Vh)(Wi-Wh)mi] / mh

Question 6

Quintile test procedure

Answer 6

1. sort class ratios (vi est) in increasing order
2. group into quintiles with about equal TT counts
3. Calculate Vquintile and Vquintile,holdout
4. Calcualte Vest,quintile and V est, quintile, holdout as weighted average of Vi est using TT counts as weights