The spatial and temporal patterns of the East African seasonal rainfall derived from principal component analysis

1989 ◽  
Vol 9 (2) ◽  
pp. 145-167 ◽  
Author(s):  
L. J. Ogallo
Keyword(s):  
Principal Component Analysis ◽  
Principal Component ◽  
Temporal Patterns ◽  
Component Analysis ◽  
Seasonal Rainfall ◽  
Spatial And Temporal Patterns ◽  
East African

scholarly journals Spatio-temporal patterns of seasonal rainfall in Spain (1912-2000) using cluster and principal component analysis: comparison

2004 ◽  
Vol 22 (5) ◽  
pp. 1435-1448 ◽  
Author(s):  
D. Muñoz-Díaz ◽  
F. S. Rodrigo
Keyword(s):  
Principal Component Analysis ◽  
Cluster Analysis ◽  
Principal Component ◽  
Temporal Patterns ◽  
Component Analysis ◽  
Atmospheric Dynamics ◽  
Seasonal Rainfall ◽  
Rainfall Distribution ◽  
Meteorology And Atmospheric Dynamics ◽  
Spatio Temporal

Abstract. In this work, cluster and principal component analysis are used to divide Spain in a limited number of climatically homogeneous zones, based on seasonal rainfall for 32 Spanish localities for the period 1912–2000. Using the hierarchical technique of clustering Ward's method, three clusters have been obtained in winter and spring, and four clusters have been obtained in summer and autumn. Results are similar to those obtained by applying principal component analysis. Centroid series of each cluster and principal component series of each EOF have been compared to analyze the temporal patterns. The comparison of both methods indicates that cluster analysis is suitable to establish spatio-temporal patterns of seasonal rainfall distribution in Spain. Key words. Meteorology and atmospheric dynamics (climatology; precipitation; general or miscellaneous)

scholarly journals Characterization of spatial–temporal patterns in dynamic speckle sequences using principal component analysis

2016 ◽  
Vol 55 (12) ◽  
pp. 121705 ◽  
Author(s):  
José Manuel López-Alonso ◽  
Eduardo Grumel ◽  
Nelly Lucía Cap ◽  
Marcelo Trivi ◽  
Héctor Rabal ◽  
...  
Keyword(s):  
Principal Component Analysis ◽  
Principal Component ◽  
Temporal Patterns ◽  
Component Analysis ◽  
Dynamic Speckle

scholarly journals Spatial and temporal patterns of precipitation in Montenegro

Időjárás ◽  
2020 ◽  
Vol 124 (4) ◽  
pp. 499-519
Author(s):  
Golub Ćulafić ◽  
Tatjana Popov ◽  
Slobodan Gnjato ◽  
Davorin Bajić ◽  
Goran Trbić ◽  
...  
Keyword(s):  
Principal Component Analysis ◽  
Hierarchical Clustering ◽  
Principal Component ◽  
Temporal Patterns ◽  
Summer Season ◽  
Monthly Precipitation ◽  
Agglomerative Hierarchical Clustering ◽  
Clustering Method ◽  
Spatial And Temporal Patterns ◽  
Precipitation Regimes

The paper analyses, spatial and temporal patterns of precipitation over Montenegro. Data on mean monthly precipitation during the period 1961–2015 from 17 meteorological stations were used for the analysis. Four regions with different spatial precipitation regimes were identified by using the principal component analysis and the agglomerative hierarchical clustering method. A downward tendency in annual precipitation prevails over Montenegro. The most prominent reduction was present in the summer season. In contrast, precipitation increased during autumn. However, the majority of estimated trend values was low and statistically insignificant.

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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