Review: William G. Cochran, Sampling Techniques

Endometrial Biopsy A Review of Sampling Techniques

Abnormal uterine bleeding (AUB) is responsible for 33% of all outpatient gynecologic visits, with the majority of cases just after menarche or in the perimenopausal period.1 Most cases are related to pregnancy, anatomic uterine pathology (fibroids, polyps, adenomyosis), anovulation, maladies of hemostasis, or neoplasia. Since evaluation of the endometrium is a key component in the diagnostic tr...

Extending the Cochran rule

We first describe a number of inter-related issues that need to be considered by the researcher when comparing frequencies of linguistic features in two or more corpora. We then describe the chi-squared and log-likelihood tests used in previous research for the comparison of word frequencies. Our focus, in this paper, is on the issue of reliability of the statistical tests, and we describe simu...

William P . Hanage , Brian G . Spratt , Katherine

A central problem in understanding bacterial speciation is how clusters of closely related strains emerge and persist in the face of recombination. We use a neutral Fisher–Wright model in which genotypes, defined by the alleles at 140 house-keeping loci, change in each generation by mutation or recombination, and examine conditions in which an initially uniform population gives rise to resolved...

William Faulkner, William James, and the American Pragmatic Tradition (review)

The Discovery of a Planetary Companion to 16 Cygni B William D. and Artie P. Cochran Hatzes

High-precision radial-velocity observations of the solar-type star 16 Cygni B (HR 7504, HD 186427), taken at McDonald Observatory and at Lick Observatory, have each independently discovered periodic radial-velocity variations indicating the presence of a Jovian-mass companion to this star. The orbital Ðt to the combined McDonald and Lick data gives a period of 800.8 days, a velocity amplitude (...