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. On a test with highvalidity the items will be closely linked to the test's intended focus. For many certificationand licensure tests this means that the items will be highly related to a specific job oroccupation. If a test has poor validity then it does not measure the job-related contentand competencies it ought to.