For power, function and intertrial interval analyses, to adjust for possible correlation within trials and among trials for which the same electrode pairs were stimulated, we used a three step GEE (general estimating equation) approach (Miglioretti and Heagerty, 2004, 2007).
A notable exception is the positive correlation between trials to acquire a discrimination and trials to acquire its reversal observed in a recent study of song sparrows, Melospiza melodia (Boogert et al., 2011).
Accordingly, a separate variance term is fitted for each trial and the covariance and hence correlation between trials can be estimated [ 30].
This imposes a structure on the interaction term that corresponds to a genetic correlation between trials.
The off-diagonal element can be used to obtain the genetic correlation between trials.
Global blinding and local definite allocation are complementary notions, and thus entanglement would be predicted, visible as a correlation across trials.
Models included patient as a fixed effect and were estimated using GEE to account for potential correlation among trials for which the same electrode pair was stimulated (Liang and Zeger, 1986).
To generate the accumulator model's reverse correlation, each trial was assigned as the left and right trial, according to the model's prediction for that trial.
This issue encompasses findings from a wide array of study designs (e.g., reviews, qualitative investigations, correlations studies, trial descriptions, pilot trial findings) of populations from high, middle, and low-income countries with clinical and non-clinical mental health issues.
For example, Experiment 4 (with "television static" images) involved perhaps the most challenging and unfamiliar sorts of adversarial images, and exhibited a powerful practice effect, with a strong positive correlation between trial number and classification accuracy, evident even as a simple linear correlation, r(6) = 0.79, p < 0.02.
