Andi
First simulate data where \(x_1\) to \(x_3\) are identical and \(x_4\) is uncorrelated with them. Each \(x\) is a z-score. Set \(y = 0.2 (x_1 + x_2 + x_3) + 0.3 x_4 + \epsilon\). Now try elastic nets, varying \(\alpha\) from 0 (ridge regression) to 1 (lasso). I used 10‑fold cross‑validation...
Andi
Counterfactual isn’t a synonym for control group. Here’s a brief Open Encyclopedia of Cognitive Science entry on counterfactual thinking, which argues that it is “extremely common and profoundly useful in ordinary life.” Whether or not you believe that your impact evaluation is counterfactual,...
Andi
When should you adjust p‑values or confidence intervals for multiple testing? It’s a complicated (and often painful) question, with the wide continuum of possible answers depicted below by Susan Ahmed (1991): I haven’t met anyone who’s an ultra conservative (on this dimension), but it may...
Andi
“A curated public collection of randomised controlled trials for evaluating covariate-adjustment methods” – over here. Includes trials of mental health interventions.
Andi
I recently attended Henrik Bengtsson’s excellent UseR! 2026 workshop on the {futureverse}. Here are a few examples to show what it does.
Andi
Two very different transmissions you can hear on SW: 14.759 MHz USB: the E07 numbers station. 6.130 MHz AM: Radio Europe. Recorded using the WebSDR shortwave receiver hosted by the ETGD amateur radio club at the University of Twente.
Andi
2237 UTC, 10 June 2026, 2761 kHz USB, using an XHDATA D-808 with XHDATA AN-80 antenna. “I hereby wish to give you confirmation that you actually heard a broadcast of the Coaststation OOSTENDERADIO on frequency 2761 kHz. at 102233 [sic] UTC JUN 2026. Our frequency 2761 kHz is a shore to ship...
Andi
Interesting comparative interrupted time series doing the rounds in the press at the moment. Chamberlain, R. C., Hodsoll, J., Cai, C., Griffiths, C., Kelly, F., Beevers, S., Stewart, G., Blangiardo, M., Elliott, P., Davies, B., & Fecht, D. (2026). Association of vehicle emission...
Andi
I reread Mayne’s (2019) on contribution analysis today and see he also allows a “what works for whom”: “… a more interesting and important contribution claim is around this evaluation question: How and why has the intervention (or component) made a difference, or not, and for whom?” (p....