Extensions of Differences in Differences (statistics) 1985 – 2011

The Difference-in-Differences (DiD) statistical method has now been in use for almost 30 years. see: ‘Using the Longitudinal Structure of Earnings to Estimate the Effect of Training Programs‘ by Orley Ashenfelter; David Card, The Review of Economics and Statistics, Vol. 67, No. 4. (Nov., 1985), pp. 648-660. (page 5 in the .pdf). And the Difference-in-Differences […]

Personifications of Death and Death Anxiety Survey

A look back at yet another presumably surprising discovery: “Personifications of Death and Death Anxiety,” Richard Lonetto, Journal of Personality Assessment, vol. 46, no. 4, 1982. The author, at the University of Guelph, explains: “University students, graduate nursing students, and funeral service students completed Templer’s Death Anxiety Scale (DAS) and a Death Personification Exercise (DPE). […]

From the mouths of babes: An existential statistic [British]

The UK’s Quarterly Labour Force Survey includes a variable called “resbby — Whether respondent is baby“. The July-September 2011 survey reports that the value of this variable is YES for 228 of the 105488 respondents. Here is the pertinent detail from that report: Here is that same detail, this time including the full graph: A year later, […]

An apparently startling discovery: Young persons send text messages

The Pew Research Center announced — in large, bold type — their apparently surprising new research finding: Texting Is Nearly Universal Among Young Adult Cell Phone Owners The vast majority of cell phone owners send and receive text messages. Large numbers of cell owners across all demographic groups do so, with the exception of mobile […]

Is Vulvar Vulgar? Whither, (withered?) and when

Vulvas get a good look in this soon-to-be-published study: “Interest in Cosmetic Vulvar Surgery and Perception of Vulvar Appearance,” Ladin A. Yurteri-Kaplan, Danielle D. Antosh, Andrew I. Sokol, Amy J. Park, Robert E. Gutman, Sheryl A. Kingsberg, Cheryl B. Iglesia [pictured here], in press at American Journal of Obstetrics & Gynecology. The authors are variously at Georgetown […]

Surveys of 1967 adults

1967 adults were deemed worth surveying, on at least two occasions: “A cross-sectional, population-based survey was conducted, with a cluster sample, defined through multiple stages, of 1,967 adults ranging from 20 to 69 years of age.” — Prevalence of minor psychiatric disorders in the City of Pelotas, RS. Rev. bras. epidemiol. [online]. 2002, vol.5, n.2, […]