Principal component analysis of geochemical data from the REE-rich Maw Zone, Athabasca Basin, Canada

AbstractPrincipal Component Analysis (PCA) was used for the mapping of geochemical data. A testing data matrix was prepared from the chemical and physical analyses of the coals altered by thermal and oxidation effects. PCA based on Singular Value Decomposition (SVD) of the standardized (centered and scaled by the standard deviation) data matrix revealed three principal components explaining 85.2% of the variance. Combining the scatter and components weights plots with knowledge of the composition of tested samples, the coal samples were divided into seven groups depending on the degree of their oxidation and thermal alteration.The PCA findings were verified by other multivariate methods. The relationships among geochemical variables were successfully confirmed by Factor Analysis (FA). The data structure was also described by the Average Group dendrogram using Euclidean distance. The found sample clusters were not defined so clearly as in the case of PCA. It can be explained by the PCA filtration of the data noise.

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Integration and analysis of remote sensing, airborne geophysics, and geochemical data of Sar Cheshmeh area by using directed principal component analysis

10.1117/12.462972 ◽

2003 ◽

Cited By ~ 1

Author(s):

Hojjatollah Ranjbar ◽

Mehdi Honarmand ◽

Zohre Moezifar ◽

Morteza Shakoori

Keyword(s):

Remote Sensing ◽

Principal Component Analysis ◽

Principal Component ◽

Component Analysis ◽

Geochemical Data ◽

Airborne Geophysics ◽

Sar Cheshmeh

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A spatially weighted principal component analysis for multi-element geochemical data for mapping locations of felsic intrusions in the Gejiu mineral district of Yunnan, China

Computers & Geosciences ◽

10.1016/j.cageo.2010.11.001 ◽

2011 ◽

Vol 37 (5) ◽

pp. 662-669 ◽

Cited By ~ 72

Author(s):

Qiuming Cheng ◽

Greame Bonham-Carter ◽

Wenlei Wang ◽

Shengyuan Zhang ◽

Wenchang Li ◽

...

Keyword(s):

Principal Component Analysis ◽

Principal Component ◽

Component Analysis ◽

Geochemical Data ◽

Weighted Principal Component ◽

Mineral District

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Principal component analysis and Mg/Fe ratios of sandstones overlying the Phoenix Deposits: Implications for uranium exploration in Athabasca Basin, Saskatchewan

10.4095/296533 ◽

2015 ◽

Author(s):

S Chen ◽

K Hattori ◽

E C Grunsky ◽

Y Liu

Keyword(s):

Principal Component Analysis ◽

Principal Component ◽

Component Analysis ◽

Athabasca Basin ◽

Uranium Exploration ◽

The Phoenix

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Principal component analysis and REE-hosting minerals of sandstones in the REE-rich Maw Zone, Athabasca Basin, Saskatchewan

10.4095/296514 ◽

2015 ◽

Author(s):

S Chen ◽

K Hattori ◽

E C Grunsky ◽

Y Liu

Keyword(s):

Principal Component Analysis ◽

Principal Component ◽

Component Analysis ◽

Athabasca Basin

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

VASA ◽

10.1024/0301-1526/a000218 ◽

2012 ◽

Vol 41 (5) ◽

pp. 333-342 ◽

Cited By ~ 3

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 Cronbachs 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. Cronbachs 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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