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Meerschman, Iris; Van Lierde, Kristiane; Van Puyvelde, Caro; Bostyn, Astrid; Claeys, Sofie; D'haeseleer, Evelien – International Journal of Language & Communication Disorders, 2018
Background: In contrast with most medical and pharmaceutical therapies, the optimal dosage for voice therapy or training is unknown. Aims: The aim of this study was to compare the effect of a short-term intensive voice training (IVT) with a longer-term traditional voice training (TVT) on the vocal quality and vocal capacities of vocally healthy…
Descriptors: Speech Therapy, Pretests Posttests, Randomized Controlled Trials, Comparative Analysis
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St. Clair, Travis; Hallberg, Kelly; Cook, Thomas D. – Society for Research on Educational Effectiveness, 2014
Researchers are increasingly using comparative interrupted time series (CITS) designs to estimate the effects of programs and policies when randomized controlled trials are not feasible. In a simple interrupted time series design, researchers compare the pre-treatment values of a treatment group time series to post-treatment values in order to…
Descriptors: Measurement Techniques, Time, Randomized Controlled Trials, Comparative Analysis