comparing control in a sentence

1. These compare control samples to participant samples, which may provide internal validity, but not external validity.
2. Some authors have criticised the use of average run lengths ( ARLs ) for comparing control chart performance, because that average usually follows a geometric distribution, which has high variability and difficulties.
3. Ley et al . ( and their reviewers ) apparently overlooked the next two studies as well, which revealed significant differences ( in the limbic brain regions that control sexual excitement and erections ) when researchers compared control subjects with subjects who had psychogenic ED.
4. Comparing control and slip conditions, after the perturbation, young adults have a longer stride length, a longer stride duration, and the same walk velocity whereas old adults have a shorter stride length, the same stride duration, and a lower walk velocity.
5. It's difficult to find comparing control in a sentence.