SITE VISIT: Free Stats

Science  26 May 2000:
Vol. 288, Issue 5470, pp. 1295b-1295
DOI: 10.1126/science.288.5470.1295b

Practically every scientist uses statistics. Pharmacologists employ regression to understand the relation between the dose of a drug and its effects in the body, while agronomists use analysis of variance to test which fertilizer makes crops grow fastest. Thanks to VassarStats, created by psychologist Richard Lowry of Vassar College in Poughkeepsie, New York, anyone can now use the most popular statistical tests to analyze their datafree of charge.

Lowry began building Internet-based stats programs back in 1988 after growing annoyed with the cost of commercial software. His site offers an easy-to-use statistical package with bread-and-butter procedures such as linear regression, one-way and two-way analysis of variance, and the Mann-Whitney, chi square, and t testsas well as some more unusual procedures. Users can type in numbers or import data from a spreadsheet. The site also features simulations and demonstrations to teach statistical principles.

Indeed, Lowry strives to demystify the magic rituals behind the process. Instead of simply displaying a final P valuethe odds of getting a significant result by chance if the experiment were repeated many timesthe output includes intermediate results and offers cautions about possible misinterpretations. To find out more, novices and experts alike can page through Lowry's lucid 17-chapter Web textbook.

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