howtos:toolcoding:using_a_relative_propensity
Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision Next revision | Previous revision Last revision Both sides next revision | ||
|
howtos:toolcoding:using_a_relative_propensity [2010/11/12 21:10] shona.weldon |
howtos:toolcoding:using_a_relative_propensity [2010/11/25 13:19] shona.weldon |
||
|---|---|---|---|
| Line 19: | Line 19: | ||
| !Equation A: | !Equation A: | ||
| - | local peoplePerHouseholdEst[uss,usdt,th] = households[uss,usdt,th] * peoplePerHousehold[usdt] | + | local populationEst[uss,th] = sum (households[uss,usdt,th] * relPopPersPerHH[usdt]; dim=usdt) |
| !Equation B: | !Equation B: | ||
| - | peoplePerHousehold[uss,usdt,th] = population[uss,th] / peoplePerHouseholdEst[uss,usdt,th] * relPopPersPerHH[usdt] | + | peoplePerHousehold[uss,usdt,th] = (population[uss,th] / populationEst[uss,th]) * relPopPersPerHH[usdt] |
| - | + | ||
| - | ===== Check your above equation through symbol substitution algebra ===== | + | |
| - | You know your identity : | + | |
| - | population[uss,th] = households[uss,usdt,th] * peoplePerHousehold[uss,usdt,th] | + | |
| - | substituting from your final math Equation B for personPerHousehold: | + | |
| - | population[uss,th] = households[uss,usdt,th] * population[uss,th] / peoplePerHouseholdEst[uss,usdt,th] * relPopPersPerHH[usdt] | + | |
| - | reordering: | + | |
| - | population[uss,th] = households[uss,usdt,th] * relPopPersPerHH[usdt] * population[uss,th] / peoplePerHouseholdEst[uss,usdt,th] | + | |
| - | Then notice the substitution can be done for Equation A from the final math above: | + | |
| - | population[uss,th] = peoplePerHouseholdEst[uss,usdt,th] * population[uss,th] / peoplePerHouseholdEst[uss,usdt,th] | + | |
| - | And the estimates cancel so you have an identity and you are comfortable your math worked | + | |
| - | population[uss,th] = population[uss,th] | + | |
howtos/toolcoding/using_a_relative_propensity.txt · Last modified: 2010/11/25 13:20 by shona.weldon
Page Tools
