Related Experiment Video
Updated: Aug 13, 2026

Measuring Sensitivity to Viewpoint Change with and without Stereoscopic Cues
Published on: December 5, 2013
Measuring change: a commentary on Keith et al. (2002)
1Kessler Medical Rehabilitation Research and Education Corporation, West Orange, New Jersey 07052, USA. smillis@kmrrec.org
Abstract:
A study by J. R. Keith et al. (2002) purported to find postoperative changes in attention in a sample of patients who underwent cardiopulmonary bypass surgery. Detecting differential patterns of neuropsychological change following treatment presents formidable methodological and statistical challenges. This commentary examines the findings of J. R. Keith et al. with regard to (a) the feasibility of randomizing research participants into treatment and control groups, (b) the handling of missing data, (c) the selection of statistical techniques to measure change, and (d) the measurement of differential neuropsychological deficit. Alternative strategies are discussed.
More Related Videos
09:01A Method for Investigating Age-related Differences in the Functional Connectivity of Cognitive Control Networks Associated with Dimensional Change Card Sort Performance
Published on: May 7, 2014
11:29Measuring the Functional Abilities of Children Aged 3-6 Years Old with Observational Methods and Computer Tools
Published on: June 20, 2020
Related Concept Videos
Regression Toward the Mean
Testing a Claim about Standard Deviation
The hypothesis testing for the claim of population standard deviation (or variance) requires the data and samples to be random and unbiased. The population distribution also must be normal. There is no specific requirement on the sample size as the estimation is based on the chi-square distribution.
As a first step, the hypothesis (null and alternative) concerning the claim about...
Observational Studies
There are three types of observational studies – Prospective, retrospective, and cross-sectional.
Prospective Study
Prospective studies, also known as longitudinal or cohort studies, are carried out by collecting future data from groups sharing similar characteristics. One example of...
Self-Evaluation Maintenance Model
Rates of Change
Rate of Change: Problem Solving