Principal component analysis study of visual and verbal metaphoric comprehension in children with autism and learning disabilities

2012 ◽  
Vol 33 (1) ◽  
pp. 274-282 ◽  
Author(s):  
Nira Mashal ◽  
Anat Kasirer
Keyword(s):  
Principal Component Analysis ◽  
Learning Disabilities ◽  
Principal Component ◽  
Children With Autism ◽  
Component Analysis ◽  
Analysis Study

Phenomenology of mixed states: a principal component analysis study

2007 ◽  
Vol 9 (8) ◽  
pp. 907-912 ◽  
Author(s):  
G Bertschy ◽  
N Gervasoni ◽  
S Favre ◽  
C Liberek ◽  
E Ragama-Pardos ◽  
...  
Keyword(s):  
Principal Component Analysis ◽  
Principal Component ◽  
Component Analysis ◽  
Mixed States ◽  
Analysis Study

A multivariate analysis of the niches of plant populations in raised bogs. I. Niche dimensions

1977 ◽  
Vol 55 (9) ◽  
pp. 1201-1210 ◽  
Author(s):  
E. A. Johnson
Keyword(s):  
Principal Component Analysis ◽  
Mineral Soil ◽  
Surface Water Quality ◽  
Principal Component ◽  
Component Analysis ◽  
Ion Concentration ◽  
Ecological Niches ◽  
Plant Populations ◽  
Analysis Study ◽  
Raised Bogs

Principal component analysis is used as an empirical procedure for defining ecological niches in plant populations in raised bogs. The two niche dimensions identified within the raised bogs are related to mineral-ion concentration: (1) atmospheric input differences owing to proximity to the ocean and (2) mineral-soil groundwater influence. Both of these niche dimensions are related to the two important gradients in the surface water quality of the state of Maine. By comparing the principal component analysis study of the vegetation with the principal component analysis study of the physical environment (peat) using transformation analysis, their very similar but non-linear relationship is demonstrated.

A German version of the Intermittent Claudication Questionnaire (ICQ): cultural adaptation and validation

VASA ◽  
2012 ◽  
Vol 41 (5) ◽  
pp. 333-342 ◽  
Author(s):  
Kirchberger ◽  
Finger ◽  
Müller-Bühl
Keyword(s):  
Principal Component Analysis ◽  
Intermittent Claudication ◽  
Completion Time ◽  
Short Form ◽  
Principal Component ◽  
Component Analysis ◽  
German Version ◽  
Average Completion Time ◽  
Sf 36 ◽  
Related Quality

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.

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