3 ms·
Perfectly right that standard deviations are not the same es errors! Compared to the average effect size, though, in this case they clearly show there's a very
by bildung 7y ago
Perfectly right that standard deviations are not the same es errors! Compared to the average effect size, though, in this case they clearly show there's a very high variation in the observed results.
The 4h is really unusually high compared to real-life reading in bed. But compared to the other studies its still quite low! One of the other studies had a whopping 6.5h hours of "bedtime reading".
- mattkrause 7y agoRight, but the point of the crossover design and mixed-effects model is that some of that variability is attributable to individual differences: you always fall asleep quickly; I toss and turn for a bit. Imagine you fall asleep in 1 minute normally, but take 11 minutes after light exposure. I take 21 minutes, but 31 after light exposure, and a third person goes from 11 to 21. The standard deviation of each condition is the same size as the effect (10 minutes), but there’s still an effect.