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求教一個(gè)利用累計(jì)概率函數(shù)擬合分布參數(shù)的問題 已有1人參與
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http://cn.mathworks.com/help/stats/examples/fitting-a-univariate-distribution-using-cumulative-probabilities.html#zmw57dd0e2006 我在看上邊matlab的文檔里邊,用CDF估計(jì)參數(shù)的部分。這里邊實(shí)際上用了一個(gè)最小化平方誤差的方法,但是里邊有個(gè)加權(quán)wgt = 1 ./ sqrt(pEmp.*(1-pEmp));不是很懂,請(qǐng)大神們指教是不是出自某篇文章里的?具體為什么這樣做會(huì)更好。 QQ圖片20151103144338.png |
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To fit a Weibull distribution to these data, notice that the CDF for the Weibull is p = Pr{X <= x} = 1 - exp(-(x/a)^b). Transforming that to log(a) + log(-log(1-p))*(1/b) = log(x) again gives a linear relationship, this time between log(-log(1-p)) and log(x). We can use least squares to fit a straight line on the transformed scale using p and x from the ECDF, and the slope and intercept of that line lead to estimates of a and b. 人家已經(jīng)講清楚啦 |
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專家經(jīng)驗(yàn): +518 |
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