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Gaurav

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Star Trek: Trekking Uncertainly Between Utopia and Twentieth Century Earth

Star Trek (and its spin-offs) are justly applauded for including socially progressive ideas in both, the themes of their stories, and the cultural fabric of the counterfactual imagination of the future. For instance, women and minorities command positions of responsibility, those working for the ‘Federation’ take ethical questions seriously, both

Size Matters, Significantly

Achieving statistical significance is entirely a matter of sample size. In the frequentist world, we can always distinguish between two samples if we have enough data (except of course if the samples are exactly the same). On the other hand, we may fail to reject even large differences when sample

Adjusting for Covariate Imbalance in Experiments with SUTVA Violations

Consider the following scenario: control group is 50% female while the participant sample is 60% female. Also, assume that this discrepancy is solely a matter of chance and that the effect of the experiment varies by gender. To estimate the effect of the experiment, one needs to adjust for the

Poor Browsers and Internet Surveys

Given, 1. Older browsers are more likely to display the survey incorrectly. 2. The type of browser can be a proxy for the respondent’s proficiency in using computers, and the speed of the Internet connection. People using older browsers may abandon surveys at higher rates than those using more

Reducing Errors in Survey Analysis

Analysis of survey data is hard to automate because of the immense variability across survey instruments—different variables, differently coded, and named in ways that often defy even the most fecund imagination. What often replaces complete automation is ad-hoc automation—quickly coded functions, e.g., recoding a variable to lie

Cricket: An Unfairly Random Game?

In many cricket matches, it is claimed that there is a clear advantage to bowling (batting) first. The advantage is pointed to by commentators, and by captains of the competing teams in the pre-toss interview. And sometimes in the post-match interview. The opportunity to bowl or bat first is decided