Abstract
Steadiness and homogeneity of hydrological quantities are mainly assumed in a customary stochastic analysis. This study gives reconsideration to this assumption, through checking homogeneity of shape of frequency-distributions. Judgement of homogeneity is given by AIC on the basis of multinomial-distribution model. If every distributions are judged not homogenous, practical grouping of those distributions is proposed by the same method.Numerical calculation is carried out with daily precipitation in Gifu city from 1891 to 1990. It is shown that six-parts dividing model in order of maximum daily precipitation is most suitable.
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