Reliability testing focuses on the following three aspects of reliability – stability, equivalence, and homogeneity. What is stability and how is it usually referred to? A type of reliability testing that focuses on the consistency of results when a test is repeated. It is also called test-retest reliability. It is expressed as an "r" value with higher numbers = greater test-retest reliability. What is equivalence and how is it usually referred to ? A type of reliability which involves the comparison of two versions of the same pencil and paper instrument or two observers who are observing (or grading) the same event. Two versions of the same test = alternate forms reliability Two judges rating the same person = inter-rater reliability It is expressed as an "r" value with values above .8 = greater IRR or alternate forms reliability. What is homogeneity and how is it usually referred to? A type of reliability testing that is used with pencil and paper testing. It addresses the correlation (or relationship) of each question on the test to other questions on the test. It basically asks...are the questions all asking about the same basic constructs? This is also known as internal consistency. Validity is a determination of how well the instrument reflects the abstract concept being examined. Validity will vary from one SAMPLE to another and from one SITUATION to another. Therefore, validity testing evaluates the use of an instrument for a specific GROUP or PURPOSE , rather than the instrument itself What is the definition of content validity, and what is the evidence for content validity of a scale? Content validity - The extent to which the measurement / questionnaire / scale includes all of the major elements or items relevant to the construct being measured. The evidence include : 1. Do the items in the scale reflect the description from the ROL? 2. How do content experts rate the items on the scale? 3. How might potential subjects respond to items on the scale?
Evidence of Validity from Convergenceis determined when a relatively new instrumentis compared with an existing instrument(s) that measures the same construct.Evidence if Validity from Divergence is when correlational procedures performed with the measures of two opposite concepts. If the divergent measure is negatively correlational with the other instrument, validity for each of the instruments is strengthened. Briefly define the concepts of accuracy, precision, and error when using physiological measures. Since physiological measures are how we quantify the level of functioning of living beings, how important is it that they be accurate? Accuracy: addresses the extent to which the instrument measures what it is supposed to in a study; comparable to validity.Precision: Accuracy with which the population parameters have been estimated withina study; also used to describe the degree of consistency or reproducibility of measurements with physiological intruments.Error in physiological measures: Error caused by environmental factors, variations in operation of equipment. Machine instability and calibration, or misinterpreted electrical signals.A highly sensitive test is very good at: identifying the disease in a patient.A highly specific test is good at: identifying the patients without a disease.Which would you rather have, a false positive or a false negative? Why?False positive: disease is thought to be present but is not….duhWhat is an observational measurement? What’s the difference between structured and unstructured types? Have you ever been measured this way? If you’ve worked as a nurse…of course you have!
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- Fall '16
- Denise Cauble
- Nursing, target population, UTA School of Nursing, UTA School