Sentences with phrase «representative systematic samples»

Index will initially be used exclusively by FMCSA for analysis and research purposes, such as selecting representative systematic samples of CDL drivers for authorized studies.

Not exact matches

These findings highlight the importance of systematic study of diagnostic criteria in representative samples of the general population.

We addressed some of the prior criticisms of EBT research by ensuring that (1) participants and study context were clinically representative, (2) there were no systematic differences in clinician competence across conditions (ie, all clinicians were randomly assigned), and (3) the sample would include the ethnic diversity that critics have found insufficient in the randomized controlled trial literature.17 - 20 Accordingly, we obtained samples from outpatient treatment programs that served the general public across a broad demographic and income range, we included only youths whose families sought treatment (ie, no recruiting or advertising), all treatment was provided by professional clinicians employed in the participating programs, and all treatment was provided in those programs (ie, not in university laboratory clinics).