Test methods, categorization

Resin examples are limited to those polymers which either require or are benefited significantly by oxygenated solvents. Data are categorized into solubility/viscosity and application/performance properties. Specific test methods are included as needed. 

The hardness of a material can be quantified using a number of different test methods, many of which have their own specific means of testing and measurement. Most of these methods categorize materials based on where they fit within a certain range of measurements under a specific test protocol. This range is called a hardness scale. Since materials in the world range from very hard (diamond) to very soft (human skin), the test protocols vary a great deal, as do the scales. Hardness data are typically presented based on the test type, the test protocol, and the value within the scale. While there is overlap between some of the test methods and scales, there is no way to convert all hardness data into a true universal hardness system. 

The PTC 10 defines three classes of testing. The code attempts to categorize testing and thereby establish an inherent degree of accuracy. These categories are based on methods of test and methods of analysis. 

Nevertheless, it is clear to us that the field of psychopathology is undergoing a transformation. There have been dramatic advances in quantitative methods that allow researchers to evaluate the basic premise behind our nosological system. Thus far the implicit assumption of the DSM was that psychiatric disorders are well represented by categorical diagnoses. This assumption is not necessarily true and may be valid only for certain mental disorders. We believe that all DSM entities must be tested using taxometrics (with CCK or non-CCK procedures). If all diagnoses are tested, we are likely to find that many of them are best conceptualized as continua. 

Quantitative methodology uses large or relatively large samples of subjects (as a rule students) and tests or questionnaires to which the subjects answer. Results are treated by statistical analysis, by means of a variety of parametric methods (when we have continuous data at the interval or at the ratio scale) or nonparametric methods (when we have categorical data at the nominal or at the ordinal scale) (30). Data are usually treated by standard commercial statistical packages. Tests and questionnaires have to satisfy the criteria for content and construct validity (this is analogous to lack of systematic errors in measurement), and for reliability (this controls for random errors) (31). 

Note Bibliography item (2), Method 514.1, Vibration , specifies tests for equipment which may be used in a variety of military applications. The equipment is categorized according to the vehicle in which it will be installed or transported as follows (a) equipment installed in airplanes and helicopters (b) equipment... 

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