Principalcomponentanalysis of distributive characteristics of precipitation in Northeast China.
(1961-1978) ; Analyse en composantes principales ; Chine ; Chine, nord-est ; Cluster analysis ; Distribution ; Géographie de l'Asie ; Précipitation ; Régionalisation climatique
Based on the results of principalcomponentanalysis applied to data of 35 stations for 1961-1978, a dynamic investigation into the factors and processes accounting for the main patterns of precipitation deviation and the changing time
characteristics in them are attempted. A climatic regionalization based on distributive patterns of precipitation is made with the results of cluster analysis. (TNC).
Four principalcomponents are found to be significant, explaining 99.8 % of the total variance. Their climatic significance is to be found respectively in (1) the general atmospheric circulation, (2) the air mass instability in summer, (3
Comparison of rainfall time series over South Africa generated from real data and through principalcomponentanalysis
Time series (scores) of rainfall from cloud bands across South Africa, generated through principalcomponentanalysis, are compared with equivalent estimated time series developed from satellite imagery and surface data. For most summer months
the principalcomponent scores are useful first approximations to the true time series. (AJC).
The socio-economic spatial structure of Ostrow Wielkopolski: a principalcomponentanalysis
This article presents the results of research into the spatial structure of the town of Ostrow Wielkopolski. Use was made of principalcomponentanalysis to transform the empirical variables into a pattern of new variates. On the basis
of this pattern, three basic components of the town's spatial structure were identified, and the spatial differentiation of the town in terms of two and three dimensions has been determined. (Les AA.).
Principalcomponentsanalysis, factor analysis, and point coordinates in the study of multivariate allometry in Geomathematical and petrophysical studies in Sedimentology. An international Symposium.
Multivariate generalizations of the bivariate allometric equations are provided by the principalcomponents or factors derived from a covariance matrix of the logarithms of the original measurements.
Defining homogeneous precipitation regions by means of principalcomponentsanalysis
for the three years together and for the three years separately. The first principalcomponent explains most of the variance (about 75 %) and is uniformly distributed over the whole region. Higher-order components delineate subregions of consistent rainfall
. No essential difference in pattern in the three years occurs between the first four components. The components patterns seem to express maritime and topographic effects, and form a basis for dividing the IJzer catchment into four coherent subregions. - (Les AA.).
The regionalisation of precipitation during the period 1972-1989 is examined adopting the S-Mode PrincipalComponentsAnalysis. Markedly different patterns were found in summer and winter. - (AJC)
A pedogenic investigation of some soil chronosequences on neoglacial moraine ridges, southern Norway : examination of soil chemical data using principalcomponentsanalysis
Dynamic variations of water quality in Taihu Lake and multivariate analysis of its influential factors
Beijing ; China ; Eutrophication ; Lake ; Pollution ; Principalcomponentsanalysis ; Seasonal variation ; Spatial variation ; Suspended load ; Water quality
Dynamic variation of water quality in Meiliang Bay and part of West Taihu Lake has been analysed based on data from 1991 to 1992. Principalcomponentanalysis is used to reveal the mutual relationships of various factors.