Skip to main content
main-content
Top

Tip

Swipe om te navigeren naar een ander artikel

22-04-2017 | Uitgave 3/2017

Journal of Psychopathology and Behavioral Assessment 3/2017

Quality Vs. Quantity: Assessing Behavior Change over Time

Tijdschrift:
Journal of Psychopathology and Behavioral Assessment > Uitgave 3/2017
Auteurs:
Andrew L. Moskowitz, Jennifer L. Krull, K. Alex Trickey, Bruce F. Chorpita

Abstract

Beyond the typical design factors that impact a study’s power (e.g., participant sample size), planning longitudinal research involves additional considerations such as assessment frequency and participant retention. Because this type of research relies so strongly on individual commitment, investigators must be judicious in determining how much information is necessary to study the phenomena in question; collecting too little information will render the data less useful, but requiring excessive participant investment will likely lower participation rates. We conducted a simulation study to empirically examine statistical power and the trade-off between assessment quality (as a function of instrument length) and assessment frequency across a number of sample sizes with intermittently missing data or attrition. Results indicated that reductions in power resulting from shorter, less reliable measurements can be at least somewhat offset by increasing assessment frequency. Because study planning involves a number of factors competing for finite resources, equations were derived to find the balance points between pairs of design characteristics affecting statistical power. These equations allow researchers to calculate the amount that a particular design factor (e.g., assessment frequency) would need to increase to result in the same improvement in power as increasing an alternative factor (e.g., measurement reliability. Applications for the equations are discussed.

Log in om toegang te krijgen

Met onderstaand(e) abonnement(en) heeft u direct toegang:

BSL Psychologie Totaal

Met BSL Psychologie Totaal blijft u als professional steeds op de hoogte van de nieuwste ontwikkelingen binnen uw vak. Met het online abonnement heeft u toegang tot een groot aantal boeken, protocollen, vaktijdschriften en e-learnings op het gebied van psychologie en psychiatrie. Zo kunt u op uw gemak en wanneer het u het beste uitkomt verdiepen in uw vakgebied.

Literatuur
Over dit artikel

Andere artikelen Uitgave 3/2017

Journal of Psychopathology and Behavioral Assessment 3/2017 Naar de uitgave