Confidence intervals and sample size calculations to compare variant frequencies.
Confidence intervals and sample size calculations to compare variant frequencies.
复制标题
用于比较不同频率的置信区间和样本量计算。
DOI:
10.1002/em.2860070807
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发表时间:
1985
期刊:
影响因子:
--
通讯作者:
Albertini,RJ
中科院分区:
文献类型:
--
作者:
Sylwester,D;Albertini,RJ
Direct mutagenicity tests offer the opportunity of monitoring human populations to detect evidence of genetic damage that occurs in vivo. As such these tests offer the potential of linking earlier exposures to mutagenic agents to subsequent health effects. One such test detects mutant T‐lymphocytes that arise in vivo in human peripheral blood. Statistical analysis of the value observed, the variant frequency (Vf), is the subject of this paper. We present and illustrate procedures for finding confidence intervals for a single variant frequency and for the ratio of two independent variant frequencies. We also derive formulae for required sample size to ensure adequate power to detect a specified change in a single variant frequency or a specified difference between two variant frequencies. Our approach is to exploit the approximate normality of the natural logarithm of a Poisson distributed variable. The procedures developed appear to be quite accurate even for the small (5–15) values often observed in the variant frequency assay. Moreover, the procedures are very easy to use and should prove valuable to investigators involved in direct mutagenicity testing.
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影响因子:
56.9
作者:
SEEGMILLER, JE;ROSENBLOOM, FM;KELLEY, WN
通讯作者:
KELLEY, WN
DOI:
--
发表时间:
1979
影响因子:
11.1
作者:
R. Pero;F. Mitelman
通讯作者:
F. Mitelman
影响因子:
5.9
作者:
LESCH, M;NYHAN, WL
通讯作者:
NYHAN, WL
DOI:
--
发表时间:
1979
期刊:
Mutation research
影响因子:
--
作者:
R. Kapp;D. Picciano;C. Jacobson
通讯作者:
C. Jacobson
DOI:
--
发表时间:
1977
期刊:
American journal of hematology/oncology
影响因子:
--
作者:
T. Papayannopoulou;V. Ahern;G. Stamatoyannopoulos;G. Lim;P. Nute;T. McGuire
通讯作者:
T. McGuire