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County Characteristics: The General Method

County Characteristics: The General Method. Calculate preliminary population estimates Produce July 1, 2000 beginning population Add births, subtract deaths, add net international migration, and add military movement Add domestic in-migration and subtract domestic out-migration*

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County Characteristics: The General Method

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  1. County Characteristics:The General Method • Calculate preliminary population estimates • Produce July 1, 2000 beginning population • Add births, subtract deaths, add net international migration, and add military movement • Add domestic in-migration and subtract domestic out-migration* • Calculate proportions • Use proportions to distribute estimates • State ASRO estimates • County total estimates (0-64, 65+) • Convert from 4 to 31 races * will be discussed in detail in this workshop

  2. County Characteristics:Domestic Migration - Overview • County interstate migration* • State interstate out- and in-migration • County interstate out-migration • County interstate in-migration • County intrastate migration* • State intrastate migration • County intrastate out-migration • County intrastate in-migration * will be discussed in detail in this workshop

  3. County Characteristics:State Interstate Out- and In-migration • Recalculate state-level in- and out-migrants using final out-rates and in-proportions from State Characteristics Estimates processing • State out-migrants = state out-migration rate * state population at the beginning of the time interval • State in-migrants = state in-proportion * ∑(state out-migrants)

  4. County Characteristics:County Interstate Out-migration • Calculate county proportions of state-level interstate out-migration • Out-migration prop. = tally #5 / tally #2 • By race-origin categories in IRS exemption data • No age or sex detail • Calculate final county interstate outs by multiplying proportions by state-level interstate out-migration data

  5. County Characteristics:County Interstate In-migration • Calculate county proportions of state-level interstate in-migration • In-migration prop. = tally #6 / ∑(tally #6 for all counties within state) (see tally handout) • By race-origin categories in IRS exemption data • No age or sex detail • Calculate final county interstate ins by multiplying proportions by state-level interstate in-migration data

  6. County Characteristics:State Intrastate Migration • Calculate a set of state-level intrastate migration rates • Intrastate-migration rate = tally #4 / tally #1 (see tally handout) • If there are less than 30 exemptions for an ASRH combination, additional ages are included until the threshold of 30 exemptions is met

  7. County Characteristics:State Intrastate Migration (cont.) • Expand to full ASRO distribution • Each ASRO cell within a collapsed category is assigned the rate of the category as a whole • Note: No age-smoothing • Calculate state intrastate migrants by ASRO • State intrastate migrants = state intrastate-migration rate * state population at the beginning of the time interval (previous vintage) • Note: Intrastate Outs = Intrastate Ins

  8. County Characteristics:County Intrastate Out-migration • Calculate county proportions of intrastate out-migration • Out-migration prop. = tally #7 / tally #4 (see tally handout) • By race-origin categories in IRS exemption data • No age or sex detail • Calculate final county intrastate outs by multiplying proportions by state intrastate migration data

  9. County Characteristics:County Intrastate In-migration • Calculate county proportions of intrastate in-migration • In-migration prop. = tally #8 / tally #4 (see tally handout) • By race-origin categories in IRS exemption data • No age or sex detail • Calculate final county intrastate ins by multiplying proportions by state intrastate migration data

  10. County Characteristics:Summary • Calculate preliminary population estimates • Produce July 1, 2000 beginning population • Add births, subtract deaths, add net international migration, and add military movement • Add domestic in-migration and subtract domestic out-migration • Calculate proportions • Use proportions to distribute estimates • State ASRO estimates • County total estimates (0-64, 65+) • Convert from 4 to 31 races

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