The phrase "a fraction of trials" is correct and usable in written English.
It can be used when referring to a small part or portion of a larger number of trials or experiments conducted.
Example: "In our study, we only analyzed a fraction of trials to draw preliminary conclusions about the effectiveness of the treatment."
Alternatives: "a portion of trials" or "a small number of trials".
In the past, voluntary registries have included only a fraction of trials.
Only a fraction of trials reported the attainment of LDL goals, despite titration studies having stated in the methods that doses could be doubled to achieve these targets.
To address this issue, the model includes a "lapse" parameter, a fraction of trials in which the animal appears to ignore the stimuli and performs randomly.
To fit this, the model includes a 'lapse' parameter, which represents a fraction of trials in which subjects will ignore the stimulus and choose randomly.
In the experiments of Müsseler and Kerzel, the same onset positions as in the constant-context condition were presented on a fraction of the trials in the random-context condition (one sixth of the trials).
However, as we had repeated a fraction of the trials, we were able to quantify the consistency of subjects by measuring the probability that they gave the same answer to the same stimuli on different occasions [ 24].
Close inspection of the supplemental data indicates that even this weak average recording is misleading, because only a fraction of the flies tested, and only a small fraction of trials, yielded any response at all.
Such an experiment would require transiently altering spatiotemporal population dynamics on a small fraction of trials so as to prevent the animal from adapting its choices to the reward feedback it might receive from altered patterns of judgment.
The effect of reward is to shift the position of this criterion relative to the distributions of evidence values, so that a greater fraction of trials contributing to each distribution fall on the high reward side of the criterion (this could also be achieved by a shift in the evidence variable in the opposite direction).
On a small fraction of trials (∼0.13) animals broke fixation during the decision period of the task without making a choice (fixation break trials).
In such a case, if the cell gradually started firing at the same, fixed peak-timing on a greater fraction of trials, its reliability score would increase.
