翻訳と辞書 Words near each other ・ Overconstrained mechanism ・ Overconsumption ・ Overconvergent modular form ・ Overcranked ・ Overcreek Dam ・ Overcrowding ・ Overcurrent ・ Overda, Kentucky ・ Overdale ・ Overdeepening ・ Overdetermination ・ Overdetermined ・ Overdetermined system ・ Overdevelopment ・ Overdiagnosis ・ Overdispersion ・ Overdog ・ Overdominance ・ Overdoor ・ Overdose (album) ・ Overdose (Ciara song) ・ Overdose (disambiguation) ・ Overdose (EP) ・ Overdose (horse) ・ Overdosed America ・ Overdosing (album) ・ Overdraft ・ Overdrafting ・ Overdramatic ・ Overdrawn at the Memory Bank Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Overdispersion ： ウィキペディア英語版 Overdispersion In statistics, overdispersion is the presence of greater variability (statistical dispersion) in a data set than would be expected based on a given statistical model. A common task in applied statistics is choosing a parametric model to fit a given set of empirical observations. This necessitates an assessment of the fit of the chosen model. It is usually possible to choose the model parameters in such a way that the theoretical population mean of the model is approximately equal to the sample mean. However, especially for simple models with few parameters, theoretical predictions may not match empirical observations for higher moments. When the observed variance is higher than the variance of a theoretical model, overdispersion has occurred. Conversely, underdispersion means that there was less variation in the data than predicted. Overdispersion is a very common feature in applied data analysis because in practice, populations are frequently heterogeneous (non-uniform) contrary to the assumptions implicit within widely used simple parametric models. ==Examples== 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「Overdispersion」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.