ectopic {meanscore}R Documentation

The Ectopic Pregnancy Dataset

Description

This dataset, which was analysed in Table 3 of Reilly and Pepe (1995) is from a case-control study of the association between ectopic pregnancy and sexually transmitted diseases(STDs). The total sample size is 979, 264 cases and 715 controls. The variables collected from the beginning of the study included gonnorhoea, contraceptive use and sexual partners (see Format).

One year after the study began, the investigators started collecting serum samples for determining chlamydia antibody status in all cases and in a 50 percent subsample of controls. As a result, only 327 out of the 979 patients have measurements for chlamydia antibody.

Usage

data(ectopic)

Format

The dataset has 979 observations with 5 variables arranged in the following columns:

Column 1 (Pregnancy)
The ectopic pregnancy status of patients at the time of interview
(0 = No, 1 = Yes)

Column 2 (Chlamydia)
The chlamydia antibody status of patients (0 = No, 1 = Yes).
There are some observations with missing values, indicating that at the time these patients were enrolled, the investigators had not yet started to record chlamydia antibody status.

Column 3 (Gonnorhoea)
(0 = No, 1 = Yes)

Column 4 (Contracept)
The use of contraceptives
(0 = No, 1 = Yes)

Column 5 (Sexpatr)
Multiple sex partners (0 = No, 1 = Yes)

Source

Sherman,et.al.(1990)

References

Reilly,M and M.S. Pepe. 1995. A mean score method for missing and auxiliary covariate data in regression models. Biometrika 82:299-314
Sherman, K.J., et.al. .1990. Sexually transmitted diseases and tubal pregnancy. Sex. Transm.Dis. 7: 115-21


[Package meanscore version 1.0-6 Index]