The National Children's Study 2014 An Assessment (2014) / Chapter Skim
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5 Data Collection Costs
5 Data Collection Costs
Pages 99-106
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From page 99... ...
Although this topic was not explicitly included in the charge to the panel from the National Institute of Child Health and Human Development (NICHD) , the panel judged that an evaluation of the scientific merits of the proposed methodologies of the NCS Main Study required an understanding of the relative benefits and costs of design options.
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From page 100... ...
In estimating field costs associated with alternative designs, our model only includes field operation tasks for which these issues would have significant cost effects. As detailed in Appendix B, it does not attempt to account for the differential costs associated with overall management at the program or contractor level, which include purchasing or building the sample frame, managing the sample and preparing sample weights, programming questionnaires, tracking and storing environmental or biological specimens, data entry, verification, transmission and management, archiving, documentation, and dissemination.
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From page 101... ...
Chapter 2 questioned the high cost and the lack of evidence of value of the 5,000-birth supplemental sample of preconception nulliparous women and the scientific rationale of supplemental samples of 5,000 that might be used for special purposes. Thus, the panel asked its cost consultants to explore a variety of approaches to maximizing prenatal recruitment while staying within the field cost constraints associated with the current design proposed for the NCS.
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From page 102... ...
It is the same as the baseline except that 97 percent of the births recruited in the probability sample of 90,000 (including siblings) and the supplemental convenience sample receive prenatal interviews, along with the preconception sample of first births.
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From page 103... ...
, the NCS can attain cost neutrality either with modest changes to the data collection protocol or by modifying the sample size. If, as recommended in Chapter 2, the other 5,000 supplemental sample component of the proposed design is dropped, then, at cost neutrality, the size of the probability sample is either close to or larger than what is achievable with the baseline specification.
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From page 104... ...
Maximum prenatal recruitment plus $1,631 ($135) 89,179 preconception supplemental sample, and convenience sample (Model 2)
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From page 105... ...
: NCS program office proposed plan (N = 100,000) Model 3: Maximum prenatal recruitment but no preconception supplement sample (N = 100,000)
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From page 106... ...
In contrast to contacting and gaining the cooperation of respon dents, modest changes in interview length contribute minimally to cost. CONCLUSION 5-3: For the same field costs and with the elimination of the 10,000 supplemental samples -- 5,000 nulliparous women and a 5,000 convenience sample -- the National Children's Study could afford to enroll a predominantly prenatal probability sample of 96,000 cases with no other changes to the proposed data collection protocol.
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