By Per Bech
Chapter 1 Classical psychometrics (pages 3–26):
Chapter 2 smooth psychiatry: DSM?IV/ICD?10 (pages 27–31):
Chapter three smooth, dimensional psychometrics (pages 32–42):
Chapter four sleek psychometrics: merchandise different types and adequate information (pages 43–52):
Chapter five The medical final result of IRT analyses: The pharmacopsychometric triangle (pages 53–73):
Chapter 6 The scientific outcome of IRT analyses: Health?related caliber of lifestyles (pages 74–81):
Chapter 7 The medical effects of IRT analyses: the idea that of pressure (pages 82–88):
Chapter eight Questionnaires as ‘blood exams’ (pages 89–94):
Chapter nine precis and views (pages 95–102):
Chapter 10 Epilogue: who is sporting Einstein's baton? (pages 103–108):
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Extra info for Clinical Psychometrics
Recently, an attempt has been made to ensure a more exact score on the Hamilton Depression Scale by assessing both frequency and severity of a symptom in an integrated score (GRID – HAM-D6). As ‘grids’ or nets, both the HAM-D6 in its GRID version and the MES can be viewed as attempts to ‘tighten the net’ to catch those symptoms that are difficult to pinpoint during an interview due to their varying frequency. John Overall: Brief, sufficient rating scales John Overall’s (1929–) PhD dissertation in 1957 from Texas University in Austin in the field of general experimental psychology led to five years’ training in psychometrics at Thurstone’s Psychometric Laboratory in North Carolina, where he came into contact with the Central Neuropsychiatric 46 Clinical Psychometrics Research Laboratory of the Veterans Administration Hospital in Perry Point, Maryland.
This was subsequently confirmed by a French study using the HAM-A (41). A major international trial with DSM-III panic attack patients confirmed this HAM-A14 two-factor model (42). , all the symptoms in the scale concur in measuring one dimension), providing enough evidence to use the total score as a sufficient statistic. But Hamilton became less confident about this conclusion when his anxiety scale was not able to distinguish between placebo and an antianxiety drug (43). , that some items have negative factor loadings and others have positive factor loadings, is perhaps the most interesting element in the factor analysis method.
How to calculate the distribution parameters. In 1922, Fisher published a paper ‘On the Mathematical Foundation of Theoretical Statistics’ in which he states that the statistician’s task is to ensure minimal loss of information when data are reduced, for example, to a normal distribution (61). It is important to find sufficient statistical expressions (sufficient statistics). Ronald A. Fisher is regarded by many as the founder of medical statistics, especially with reference to the first edition of ‘Statistical methods for research workers’ in 1925, which, as mentioned previously, Hotelling reviewed in 1927.