The method of principal component analysis based on chi-square distance with regional application

1978 ◽  
Vol 8 (2) ◽  
pp. 129-151
Author(s):  
A. Strohmeier ◽  
D. Liechti
Author(s):  
Christian Mormont ◽  
Patrick Fontan

Abstract. According to the theory of identification, men are more likely to qualify their Rorschach human content responses as males, and women as females. These assumptions were tested in an empirical investigation using a Belgian nonpatient sample of 800. All human responses and their location were listed. Analyses were carried out on the 10 Cards and on the formal quality (FQo vs. FQu/−) of all human responses according to the subject’s and the examiner’s sex. Variables were first submitted to principal component analysis, and resulting components were compared in a 2 × 2 design in order to assess examiners’ and participants’ sex potential effects on human responses sex assignments. Univariate and multivariate ANOVA revealed no or only negligible differences. In a second step, distributions of masculine, feminine, and neutral human responses across 16 card locations that commonly elicit human responses were submitted to hierarchical clustering in order to identify masculine, feminine, and neutral locations in Rorschach cards. Chi-square tests revealed no significant association between participants’ sex and human responses locations. Results do not corroborate predictions according to the theory of identification but they do, however, highlight the role of the distal features of blots.


2018 ◽  
Vol 7 (2.32) ◽  
pp. 233
Author(s):  
Pratuisha K ◽  
Rajeswara Rao .D ◽  
J V.R.Murthy

With growing congenital anamelies in recent years detection of heart problems in fetus has become critical. Cardiotocography test assists doctors in such dignosis followed by cure. Here analytics of cardiotocography data is presented in details.Understanding ,cleaning and preprocessing the data is one of the the foremost part for any researcher,In this work data is cleaned,preprocessed,normalized, Also the attributes are selected by using the Chi-square test. Colinearity problem is addressed using Principle component analysis.Such analytics and prepro-cessing will help in machine learning or allied models for predict-ing precise diagnosis at an early stage 


2012 ◽  
Vol 72 (3) ◽  
pp. 388-414 ◽  
Author(s):  
Yan Liu ◽  
Bruno D. Zumbo

There is a lack of research on the effects of outliers on the decisions about the number of factors to retain in an exploratory factor analysis, especially for outliers arising from unintended and unknowingly included subpopulations. The purpose of the present research was to investigate how outliers from an unintended and unknowingly included subpopulation affected the decisions about the number of factors to retain using four commonly used methods separately. The results showed that all the decision methods could provide biased results and the number of factors could be inflated, deflated, or remain the same depending on the decision methods used and outlier conditions. The findings also revealed that symmetric outliers did not affect the three principal component analysis–based methods but affected chi-square (ML) sequential tests. Finally, sample size did not play a role in the effect of outliers.


VASA ◽  
2012 ◽  
Vol 41 (5) ◽  
pp. 333-342 ◽  
Author(s):  
Kirchberger ◽  
Finger ◽  
Müller-Bühl

Background: The Intermittent Claudication Questionnaire (ICQ) is a short questionnaire for the assessment of health-related quality of life (HRQOL) in patients with intermittent claudication (IC). The objective of this study was to translate the ICQ into German and to investigate the psychometric properties of the German ICQ version in patients with IC. Patients and methods: The original English version was translated using a forward-backward method. The resulting German version was reviewed by the author of the original version and an experienced clinician. Finally, it was tested for clarity with 5 German patients with IC. A sample of 81 patients were administered the German ICQ. The sample consisted of 58.0 % male patients with a median age of 71 years and a median IC duration of 36 months. Test of feasibility included completeness of questionnaires, completion time, and ratings of clarity, length and relevance. Reliability was assessed through a retest in 13 patients at 14 days, and analysis of Cronbach’s alpha for internal consistency. Construct validity was investigated using principal component analysis. Concurrent validity was assessed by correlating the ICQ scores with the Short Form 36 Health Survey (SF-36) as well as clinical measures. Results: The ICQ was completely filled in by 73 subjects (90.1 %) with an average completion time of 6.3 minutes. Cronbach’s alpha coefficient reached 0.75. Intra-class correlation for test-retest reliability was r = 0.88. Principal component analysis resulted in a 3 factor solution. The first factor explained 51.5 of the total variation and all items had loadings of at least 0.65 on it. The ICQ was significantly associated with the SF-36 and treadmill-walking distances whereas no association was found for resting ABPI. Conclusions: The German version of the ICQ demonstrated good feasibility, satisfactory reliability and good validity. Responsiveness should be investigated in further validation studies.


Sign in / Sign up

Export Citation Format

Share Document