cycles: Fecundability and smoking.

In trobinj/trtools: Miscellaneous Tools for Teaching Statistics

Fecundability and smoking.

Description

Data from an observational study that recorded the number of menstrual cycles required to achieve pregnancy for smoking and non-smoking women.

Usage

cycles

Format

A data frame of 586 observations and two variables:

cycles:

number of menstrual cycles until pregnancy

mother:

smoking status of mother

Note

Note that the number of cycles is right-censored at 13 so that all observationrecorded as 13 are actually 13+. These data were featured in Pawitan (2013) and Weinberg and Gladen (1986). They are a subset of the data collected in a study described by Baird and Wilcox (1985).

Source

Baird, D. D. & Wilcox, A. J. (1985). Cigarette smoking associated with delayed conception. Journal of the American Medical Association, 253, 2979-2983.

Pawitan, Y. (2013). In all likelihood: Statistical modeling and inference using likelihood. Oxford University Press.

Weinberg, C. R. & Gladen, B. C. (1986). The beta-geometric distribution applied to comparative fecudability studies. Biometrics, 42, 547-560.

trobinj/trtools documentation built on Jan. 28, 2024, 3:20 a.m.