Reliability and Validity Paper Essay Example | Topics and Well Written Essays - 750 words

Reliability and Validity Paper - Essay Example and therefore proceeds with How it will be measured? (Desarbo, William, & Babin, 2009) A measurement is defined as good if it fulfills the criteria of validity and reliability. Reliability Reliability measures the bound to which the exam yields consistent results each epoch it is conducted and across various situations and includes the following (Neukrug, 2008). Test-retest This involves conducting the same scale or test to similar respondents at two different points in time (Neukrug, 2008). For example, a researcher arouse in measuring the number of times an average adult worker falls sick in spite of appearance a year discovers that 68% of the population falls sick at least thrice. If this test is conducted again, low similar conditions, and it is discovered again that 68% of the population falls sick at least thrice a year, it indicates that the test is reliable. Split- half Under this the researcher checks one half of the resu lts of a test against the other half to check for internal consistency (Neukrug, 2008). For example, a researcher who has measured good quality of human service at a hospital in terms of four items ambience, proper equipment, quick summons and educate staff can split the results by grouping the results of ambience and proper equipment together and quick procedure and trained staff together respectively and then check the Chronbachs alpha for these two groups. ... If the results obtained through with(predicate) the two tests show high correlation, then the tests are considered to be reliable. Validity Validity refers to the extent to which the test measures what it is supposed to measure that is, the extent to which the test meets its objectives (Neukrug, 2008). The following are the types of validity Face or essence validity This results from the consensus amongst experts that a scale logically appears to be reliable (Neukrug, 2008). For instance, questions such as how many chil dren do you have? asked by a researcher regarding the effectiveness of family planning programs are generally assumed to weather up to face validity. Criterion Validity If the measure correlates with another measure of the same construct then it is assumed to have criterion validity (Desarbo, William, & Babin, 2009). If the in the raw measure is tested at the same time as the old measure and is shown to be valid it is known as concurrent validity and if the new measure is tested at a later time and is shown to be valid then it is prophetic validity (Desarbo, William, & Babin, 2009). For example, in tests reveal that the effectiveness of the prototype provide correct estimate of the effectiveness of the concluding medicine 80% of the time, then the test has predictive validity. If, however, the same correlation is established between the net medicine (after its manufactured) and its prototype at the same time, then it will have concurrent validity. take a crap Validity This ref ers to the extent to which the measure confirms a network of hypothesis based on a opening to which the concepts are related (Monette, Sullivan, & DeJong, 2010). Convergent