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Oregon PRAMS Report; 1998-99

Oregon PRAMS: First Year Report, 1998-99

Appendix D:

Weighting Scheme


Eligible Mothers: must be an Oregon Resident and the baby must be born in Oregon.
Only 1 of any twins or triplets are given a chance to be sampled. PRAMS Year 1: Dates of birth from August 1, 1998 to August 9, 1999


Total Births for Year 1:
Total Eligible Births for PRAMS inclusion: 45,043

Total Sampled: 2,919
Total Respondents: 1,867

SPSS Syntax code for Weighting:


*PRAMS Weighting Scheme
* d:\finalwt\py1fwt2.sps
* als 08/17/00 N (Birth Certificate) = 45,043 N (PRAMS) = 45,054

* I. Weight 1: Stratum

if (bcrace = "Hispanic") weight1 = 6680/686.
if (bcrace = "AI/AN") weight1 = 660/339.
if (bcrace = "Asian/PI") weight1 = 2080/521.
if (bcrace = "African Am") weight1 = 910/422.
if (bcrace = "White" and wtcat = "NBW") weight1 = 33162/537.
if (bcrace = "White" and wtcat = "LBW") weight1 = 1562/414.

* II. Weight 2: Unit Non-response
numeric weight2 (F5.2).

*1) American Indian/Alaskan Native


if (bcrace = "AI/AN" and pnchigh = 0) weight2 = 103/46.
if (bcrace = "AI/AN" and pnchigh = 1 and (marstat = 1 or (marstat = 0 and agelow = 1))) weight2 =
156/124.
if (bcrace = "AI/AN" and pnchigh = 1 and marstat = 0 and agelow = 0) weight2 = 80/44.

*2) Hispanic


if (bcrace = "Hispanic" and marstat = 0) weight2 = 285/166.
if (bcrace = "Hispanic" and marstat = 1) weight2 = 401/277.

*3) African American


if (bcrace = "African Am" and loweduc = 0) weight2 = 329/177.
if (bcrace = "African Am" and loweduc = 1) weight2 = 93/34.

*4) Asian/Pacific Islander


if (bcrace = "Asian/PI" and loweduc = 0) weight2 = 445/275.
if (bcrace = "Asian/PI" and loweduc = 1) weight2 = 76/31.

*5) NBW White


if (bcrace = "White" and wtcat = "NBW" and higheduc = 1) weight2 = 267/224.
if (bcrace = "White" and wtcat = "NBW" and higheduc = 0 and agehigh = 0) weight2 = 218/162.
if (bcrace = "White" and wtcat = "NBW" and higheduc = 0 and agehigh = 1) weight2 = 52/29.

*6) LBW White


if (bcrace = "White" and wtcat = "LBW" and marstat = 0) weight2 = 151/91.
if (bcrace = "White" and wtcat = "LBW" and marstat = 1) weight2 = 263/187.

*III. Weight3: Coverage


numeric weight3 (F5.2).
compute weight3 = 45043/45054.

*IV. Final Weight


numeric fweight (F6.2).
compute fweight = weight1*weight2*weight3.

execute.
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