sample validity and reliability in research

It refers to the measuring procedure rather than to the attribute being measured. Reliability: A measure of how dependably an observation is exactly the same when repeated. Lack of validity is referred to as ‘ Bias‘ or ‘ systematic error‘. Internal validity: Are the results valid for the study subjects?Įxternal validity (Generalizability): Are the results valid for the population from which the sample was drawn? Simply put: Are the values describing what was supposed to be measured? Validity: The extent to which the study measures what it is intended to measure. Lack of precision is referred to as ‘ random error‘. Simply put: How close the measurements are to each other

Precision: The degree of resemblance among study results, were the study to be repeated under similar circumstances. Simply put: How close a measurement is to the true value In order for research data to be of use it must. Reliability refers to the repeatability of research findings while validity refers to the believability and credibility of those findings (Litwin, 1996). The two terms generally refer to the truthfulness of something. In summary, Rasch Model is suitable to apply in instrument validation process because the concept of item response theory.In public health the terms accuracy, precision, validity and reliability mean the following:Īccuracy: The degree to which a measurement represents the true value of something. Reliability and validity are two terms commonly used in statistics and research. Percent-agreement statistics can be calculated and explained easily. Assessor agreement can be calculated as percent-agreement. Three experts in the building construction subject examined the content validity of SPCD and CMAT. Valid results ensure the accuracy of experimental methods to support a theory. For results to be reliable, they must be reproducible. For results to be valid, they usually appear reliable as well. The construct validity was analyzed based on the Rasch model with infit and outfit mean square (MNSQ) value. The relationship between validity and reliability is important for scientific methods and research. The value of reliability was based on Cronbach alpha with appropriate values range. The ILS consists of four constructs, whereas the SPCD and CMAT validate based on three constructs. A small survey was conducted on 28 vocational college students enrolled in the Building Construction course. The study aims to produce empirical evidence of validity and reliability using the Rasch Model. Students’ Perception in Cognitive Dimension (SPCD) was developed to identify student perception toward their cognitive abilities, and Students’ Cognitive Mastery Achievement Test (CMAT) is used to measure student mastery in a particular subject.

The Felder-Solomon Index of Learning Styles (ILS) is essential to find out the learning style abilities of learners. Three sets of research instruments were developed in this study. This paper discussed how the applying of Rasch Model in validity and reliability of research instruments.

Sample validity and reliability in research