Counts of Ovarian Follicles

Description

The Ovary data frame has 308 rows and 3 columns.

Format

This data frame contains the following columns:

Mare

an ordered factor indicating the mare on which the measurement is made.

Time

time in the estrus cycle. The data were recorded daily from 3 days before ovulation until 3 days after the next ovulation. The measurement times for each mare are scaled so that the ovulations for each mare occur at times 0 and 1.

follicles

the number of ovarian follicles greater than 10 mm in diameter.

Details

Pierson and Ginther (1987) report on a study of the number of large ovarian follicles detected in different mares at several times in their estrus cycles.

Source

Pinheiro, J. C. and Bates, D. M. (2000), Mixed-Effects Models in S and S-PLUS, Springer, New York. (Appendix A.18)

Pierson, R. A. and Ginther, O. J. (1987), Follicular population dynamics during the estrus cycle of the mare, Animal Reproduction Science, 14, 219-231.

Examples

data(Ovary)