The phrase "a subset of trials" is correct and usable in written English.
It can be used when referring to a smaller group of trials that are part of a larger set in a scientific or experimental context.
Example: "In our research, we analyzed a subset of trials to determine the effectiveness of the new treatment."
Alternatives: "a portion of trials" or "a segment of trials".
Here we used all data trials rather than a subset of trials.
In the Money condition, the incentive was an opportunity to win monetary bonuses on a subset of trials.
In the Liquid condition, the incentive was the opportunity to receive (again on a subset of trials) a squirt of apple Juice delivered directly into the mouth.
First, we confined our analysis to a subset of trials in which all combinations of relevant and irrelevant objects number existed (i.e. trials in which relevant and irrelevant objects number was less than 4).
We used a different approach to overcome this limitation: Unbeknownst to the subjects, we included a subset of trials in which the lengths of the two bars were identical.
In such studies participants typically apply the same stimulus-response mapping on every trial, but on a subset of trials switch from attending to one stimulus feature (e.g. color) to attending to another stimulus feature (e.g. shape).
In September 2011 all trial plots were topped (cut) and half of a subset of trial plots were then scarified (60% of soil surface disturbed).
In a subset of trial participants who had low levels of Ebola virus in the blood, however, the mortality was just 15%.
Internist Chester B. Good at the VA Medical Center in Pittsburgh worries that, in a subset of trial participants studied carefully for side effects, more vaccinated people had severe medical problems than did placebo patients (1.9% versus 1.3%).
The ancillary study started after the original trial was in progress and only a subset of trial subjects participated.
Potentially, these technologies could rapidly trawl through a subset of trial samples to identify the most informative biomarkers to be implemented in the context of that trial.
