HLTH 200 Lecture Notes - Lecture 10: Criterion Validity, Predictive Validity, Longitudinal Study
Document Summary
Use when you administer a single test to a sample on one occasion. Assess the consistency of the results for different items for the same construct within the same measure: inter-item correlation, item-total correlation, cronbach"s alpha. Ranges from 0 to 1, with higher values indicating greater internal consistency (and ultimately reliability) A value of 1. 0 means complete agreement (i. e. redundancy). So you likely need to eliminate to items: (you want your value as high as possible, except 1. 0. If you get 1. 0, it is completely redundant the tests are measuring the exact same thing) Items that are in perfect agreement with each other do not each uniquely contribute to the measurement in the construct they are intended to measure, so they should not both be included in the scale. The process of observing and recording the observations that are collected as part of a research effort.
