howtos:toolcoding:using_a_relative_propensity
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howtos:toolcoding:using_a_relative_propensity [2010/11/12 20:59] shona.weldon |
howtos:toolcoding:using_a_relative_propensity [2010/11/25 13:19] shona.weldon |
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| - | ====== Using a relative propensity ====== | + | ====== Using relative propensities to create data based on some simple assumptions ====== |
| When you have an equation with more unknowns that constraints and you want to add some assumptions to solve it you may add a relative propensity calculation. Best served by an example. | When you have an equation with more unknowns that constraints and you want to add some assumptions to solve it you may add a relative propensity calculation. Best served by an example. | ||
| + | ===== Example ===== | ||
| Given: | Given: | ||
| households[uss,usdt,th] | households[uss,usdt,th] | ||
| Line 17: | Line 18: | ||
| Finally the math to calculate peoplePerHousehold[uss,usdt,th] is: | Finally the math to calculate peoplePerHousehold[uss,usdt,th] is: | ||
| - | local peoplePerHouseholdEst[uss,usdt,th] = households[uss,usdt,th] * peoplePerHousehold[usdt] | + | !Equation A: |
| - | peoplePerHousehold[uss,usdt,th] = population[uss,th] / peoplePerHouseholdEst[uss,usdt,th] * relPopPersPerHH[usdt] | + | local populationEst[uss,th] = sum (households[uss,usdt,th] * relPopPersPerHH[usdt]; dim=usdt) |
| - | + | !Equation B: | |
| + | peoplePerHousehold[uss,usdt,th] = (population[uss,th] / populationEst[uss,th]) * relPopPersPerHH[usdt] | ||
howtos/toolcoding/using_a_relative_propensity.txt · Last modified: 2010/11/25 13:20 by shona.weldon
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