Application de l'analyse factorielle en composantes principales à l'étude de la variabilité régionale et interannuelle des précipitations ardéchoises

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Abstract
This study uses 12 series of 40 annual rainfalls (1931 to 1970) previously controled and covering the department of Ardèche. Authors applied a multivariate factor analysis to the matrix (12 X 40) of annual precipitations. This points out two important factors of spatial dispersion : on one hand the « plateau du Coiron » and on the other hand the distance from the Rhône Valley. Projected on these two factors the observation-dots show graphically the annual variability of the spatial dispersion.