After a person has been diagnosed with schizophrenia in a family, the chance for a sibling to also be diagnosed with schizophrenia is 7 to 9 percent. If a parent has schizophrenia, the chance for a child to have the disorder is 10 to 15 percent. Over 250,000 diagnosed cases in Britain. 2  Rates of schizophrenia are generally similar from country to countryabout .5% to 1 percent of the population (there are variations-but the variance is difficult to track due to differing measuring standards in many countries, etc.).
View Full Document. Test Bias â A test bias is a systematic difference in the meaning of test scores amongst different groups. There are internal and external ways to identify test score bias. Test Fairness â This refers to how a test is used.
How do you Determine if a Test has Validity, Reliability, Fairness,and Legal Defensibility? 1Professional Testing Inc.Â© PTI 2006 1. Validity Validity is arguably the most important criteria for the quality of a test. The term validityrefers to whether or not the test measures what it claims to measure.he facevalidity of a test is sometimes also mentioned. 2. Reliability Reliability is one of the most important elements of test quality. It has to do with theconsistency, or reproducibility, or an examinee's performance on the test.