Objective Is Questionable

"Truth" is Stranger than Prediction, More Questionable than Causal Inference

Robert Luskin's article in this issue provides a useful service by appropriately qualifying several points I made in my 1986 American Journal of Political Science article. Whereas I focused on how to avoid common mistakes in quantitative political science, Luskin clarifies ways to extract some useful information from usually problematic statistics: correlation coefficients, standardized coeffic...

Bacterial activity in South pole snow is questionable.

The Questionable Tooth

The purpose of this article is to provide a review of the small but loud debate that has surrounded fluoride over the past 50 years. The benefits of fluoridation and its effect on public health are well known throughout the dental community. What is far less well known are the objections from people— in the tradition of the old amalgam and radiograph radiation debates—who feel that fluoride has...

A questionable bruise.

It is occasionally difficult to distinguish between a self-inflicted bruise and true bruise. The important point of diagnosis is a good, thorough history taking and detailed examination of the affected area.

A Questionable Distance-Regular Graph

In this paper, we introduce distance-regular graphs and develop the intersection algebra for these graphs which is based upon its intersection numbers. We discuss results following from the definition of the intersection algebra. We investigate two examples of distance-regular graphs and show how these results apply. Finally, we introduce parameters that determine intersection numbers. We inves...