Depression classification

Figure 3.2. Perceptron solution of the depression classification problem.

A multilayer perception with two hidden units is shown in Figure 3.7, with the actual weights and bias terms included, after training. This network can solve the nonlinear depression classification problem, presented in Figure 3.4. 

Figure 4.4 illustrates a radial basis function solution to the hypothetical depression classification problem. The algorithm that implemented the radial basis function application determined that seven cluster sites were needed for this problem. A constant variability term, a2 =. 1, was used for each hidden unit. Shown in the diagram are the two central parameters (because there are two input units) for each of the seven Gaussian functions. 

Paykel ES, Parker RR, Penrose RI, Rassaby ER. Depressive classification and prediction of response to phenelzine. Br J Psychiatry 1979 134 572-81. 

However, it has to be considered that it is neither the content of free formaldehyde itself nor the molar ratio which eventually should be taken as the decisive and the only criterion for the classification of a resin concerning the subsequent formaldehyde emission from the finished board. In reality, the composition of the glue mix as well as the various process parameters during the board production also determine both performance and formaldehyde emission. Depending on the type of board and the manufacturing process, it is sometimes recommended to use a UF-resin with a low molar ratio F/U (e.g. F/U = 1.03), hence low content of free formaldehyde, while sometimes the use of a resin with a higher molar ratio (e.g. F/U = 1.10) and the addition of a formaldehyde catcher/depressant will give better results [17]. Which of these two, or other possible approaches, is the better one in practice can only be decided in each case by trial and error. 

According to other classification acne scars are divided to elevated, dystrophic or depressed [7]. Elevated scars are subdivided to hypertrophic, keloidal, and papular, while depressed scars are subdivided to distensible and non-distensible (Fig. 9.4). 

Kleinman (1986) claimed that neurasthenia was a cultural form of chronic somatization that outlined several different types of psychopathological disorders, the major depressive disorder included in western classifications being the one that best accounted for this disorder. This would explain the lower rate of prevalence of the diagnosis of depressive disorder among the Chinese population. 

We examined the data in a number of ways. One was to use the classification system established by the APA to categorize levels of depression. The APA system, which was also adopted by NICE, divides scores on the Hamilton depression scale into the following five categories ... 

Implications of the prototypic classification method are that categories within the system will possess fuzzy boundaries. Individuals within a category will be somewhat heterogeneous and may not share any common features. In our depression example, a prototypic classification scheme may yield a diagnosis of depression in one patient who shows agitation, anhedonia, and suicidal ideation and the same diagnosis in another patient who shows sadness, fatigue, worthlessness, and decreased appetite. 

The term "bipolar disorder" originally referred to manic-depressive illnesses characterized by both manic and depressive episodes. In recent years, the concept of bipolar disorder has been broadened to include subtypes with similar clinical courses, phenomenology, family histories and treatment responses. These subtypes are thought to form a continuum of disorders that, while differing in severity, are related. Readers are referred to the Diagnostic and Statisticial Manual of Mental Disorders of the American Psychiatric Association (DSM-IV) for details of this classification. 

In twelve of sixty-three patients, both the serum IgM and the serum IgG concentrations were depressed. Two of these Burkitt s lymphoma children also had low IgA, but in the other 10 children the scrum IgA was normal. There were 5 known deaths in children classified with this type II deficiency. Seven of these children had tumor classification of the grade III type III immunoglobulin deficiency. There were 14 children with Burkitt s lymphoma classified with this type III immunoglobulin deficiency with moderately reduced levels of scrum IgG and normal levels of IgM. One child in the grouji had a moderately elevated IgA,... 

Davidson JR, McLeod MN, Turnbull CD, et al (1979) Catechol-O-methyltransferase activity and classification of depression, fiiol Psychiatry 46 557-567... 

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