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The Modified Lognormal Power-Law (MLP) function is a three parameter function that can be used to model data that have characteristics of a lognormal distribution and a power-law behavior. It has been used to model the functional form of the Initial Mass Function (IMF). Unlike the other functional forms of the IMF, the MLP is a single function with no joining conditions. ==Functional form of the MLP distribution== If the random variable W is distributed normally, i.e. W ~ N (μ,σ2), then the random variable M = eW will be distributed lognormally: : The parameters and follow while determining the initial value of the mass variable, lognormal distribution of . If the growth of this object with is exponential with growth rate , then we can write . After time , the mean of the lognormal distribution would have changed to . However, considering time as a random variable, we can write . The closed form of the probability density function of the MLP is as follows: : where . 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Modified lognormal power-law distribution」の詳細全文を読む スポンサード リンク
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