A resolution of the ascertainment sampling problem. II. Generalizations and numerical results.

Abstract:

:The ascertainment problem arises when families are sampled by a nonrandom process and some assumption about this sampling process must be made in order to estimate genetic parameters. Under classical ascertainment assumptions, estimation of genetic parameters cannot be separated from estimation of the parameters of the ascertainment process, so that any misspecification of the ascertainment process causes biases in estimation of the genetic parameters. Ewens and Shute proposed a resolution to this problem, involving conditioning the likelihood of the sample on the part of the data which is "relevant to ascertainment." The usefulness of this approach can only be assessed by examining the properties (in particular, bias and standard error) of the estimates which arise by using it for a wide range of parameter values and family size distributions and then comparing these biases and standard errors with those arising under classical ascertainment procedures. These comparisons are carried out in the present paper, and we also compare the proposed method with procedures which condition on, or ignore, parts of the data.

journal_name

Am J Hum Genet

authors

Shute NC,Ewens WJ

subject

Has Abstract

pub_date

1988-10-01 00:00:00

pages

374-86

issue

4

eissn

0002-9297

issn

1537-6605

journal_volume

43

pub_type

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