validity and reliability in assessment methods

We note that although the definition and properties of each of these methods is well established inappropriate methods continue to be used in medical literature for assessing reliability and validity, as evidenced in the context of the evaluation of the WHO Colour Scale. The methods we consider are: linear regression, correlation coefficients, paired t-tests plotting differences against mean values and deriving limits of agreement kappa and weighted kappa statistics, sensitivity and specificity, an intraclass correlation coefficient and the repeatability coefficient.

Validity refers to whether a test measures what it claims to measure. This Colour Scale is a discrete interval scale, whereas the actual haemoglobin values it is used to estimate are on a continuous interval scale and can be measured accurately using electrical laboratory equipment. The value of a test is based on 2 characteristics: validity and reliability. The WHO Colour Scale was developed under the auspices of the WHO to provide a simple portable and reliable method of detecting anaemia. reliability of performance ratings are often found to. Data from a study that was conducted to evaluate the usefulness of a specific measurement tool (the WHO Colour Scale) is then used to illustrate the application of these methods. tivist assessment approaches call for a validity theory that provides the theoretical framework. In this paper we review some commonly used methods. Several statistical methods have been developed, or used, to evaluate the reliability and validity of a new assessment method in such circumstances. When thinking about validity and reliability in classroom assessment, there are four questions to consider: Why am I doing this assessment, What techniques. Before introducing a new measurement tool it is necessary to evaluate its performance. Validity is commonly understood as referring to the outcomes of an assessment and whether the evidence known about the assessment supports the way in which.

Validity and reliability in assessment methods