There are two findings summarized from previous studies:(1) the least squares estimator is a common choice of researchers, but under an unequal probability design, the estimator is biased,(2) the probability weighted estimator is consistent but may have a large variance.

過去的研究發(fā)現(xiàn)：(1)在不等機(jī)率抽樣時鸥美裸体黄片，一般常用的最小平方法所得到的回歸參數(shù)估計式并非不偏估計式；(2)機(jī)率加權(quán)最小平方法可以改善不偏性国产第一页国产精品，然卻增加估計的變異程度欧美性爱在线电一影。

However, MLE is a biased estimator of the fold change and minimum variance estimator of the fold change exists under the log-normal distribution.

然而相對表現(xiàn)量在對數(shù)常態(tài)分布時應(yīng)用最小變異不偏估計法較 MLE 具有不偏性和最小變異。

The nonexistence of global weak solution to elliptic equation and the evolution equation, together with the nonexistence of local weak solution to hyperbolic equation is contained in this paper.

本文運用試驗函數(shù)法研究了帶有非局部源的偏微分方程的全局弱解的不存在性三级片黄色A片在线免费观看一区，內(nèi)容包括橢圓方程人人爱人人操人人摸人人干人人爱、發(fā)展方程全局解的不存在性以及雙曲型方程的局部弱解的不存在性。

The simulation results also find that the Quasi-Aitken weighted least squares estimator has a smaller asymptotic variance than least squares estimator.

研究結(jié)果顯示機(jī)率加權(quán)最小平方法與Quasi-Aitken機(jī)率加權(quán)最小平方法的回歸參數(shù)估計式皆具有不偏性日本高潮视频，其中Quasi-Aitken機(jī)率加權(quán)最小平方法的回歸參數(shù)估計式的變異最小人人射精品视频。

ISO834 and parametric equation approach are lack of pertinence. The results may be too conservative. The temperature obtained by zone model is low, so that it is not suitable for the performance-based fire protection design on this structure. Field model considers the heterogeneity of environmental temperature, and its result is close to the real fire, so that it is commended to the performance-based fire protection design on steel staggered-truss structure.

國際標(biāo)準(zhǔn)升溫曲線和參數(shù)化室內(nèi)升溫曲線不考慮火源功率、建筑通風(fēng)口等因素又黄又硬又爽的网站，缺乏針對性mmm美女视频，分析結(jié)果偏于保守少妇人妻综合久久中文；區(qū)域模型所得溫度偏低，不宜用于交錯桁架結(jié)構(gòu)的性能化抗火設(shè)計亚洲性A好视频；場模型考慮了火源功率及環(huán)境溫度分布的不均勻性国产91av网站手机免费在线播放，和實際火災(zāi)較接近，計算結(jié)果相對較為準(zhǔn)確永久视频在线官网，可用于結(jié)構(gòu)的性能化防火設(shè)計每日国产在线观看论坛AV。

Based on Monte Carlo method,four different weighted function moment methods for Pearson Ⅲ distribution which were developed in China are first compared by using the evaluation standard considering unbiasness and effectiveness of parameters and design values.

利用統(tǒng)計試驗方法，以參數(shù)及設(shè)計值不偏性清纯唯美亚洲激情、有效性為評價標(biāo)準(zhǔn)人人曰人人澡，比較了現(xiàn)行幾種權(quán)函數(shù)參數(shù)估計法，結(jié)果與以理想樣本還原準(zhǔn)則為標(biāo)準(zhǔn)所得的結(jié)論截然相反西西人体大胆午夜视频无码，以不偏性AV女同免费一区二区三区在线、有效性標(biāo)準(zhǔn)的結(jié)論是數(shù)值積分權(quán)函數(shù)法，并未對馬秀峰權(quán)函數(shù)法作出改進(jìn)a级国产制服影院，還從理論上比較分析以上兩種評價標(biāo)準(zhǔn)91精品国产高清久久久，結(jié)論是理想樣本還原為標(biāo)準(zhǔn)來評判估計方法的優(yōu)劣存在較大缺陷，建議今后盡量不要使用該標(biāo)

Variational identity play a important role to prove nonexistence and get prior estimate of solution, In this thesis, we study following parts on the relationship of symmetry group of partial differential equations with variational structure and the variational identity.

變分恒等式在證明具有變分結(jié)構(gòu)偏微分方程解的不存在性以及得到方程解的先驗估計時有著非常重要的作用欧美一级A片永久免费无蔗挡，本文研究了一些具有變分結(jié)構(gòu)偏微分方程的對稱群與其變分恒等式的關(guān)系www.啊啊啊啊操我好爽.com。

The results show that under the condition of the experiments, the high KOH concentration is benefit to the formation of soluble niobate, but the high temperature is favor of the formation of insoluble niobate, and the insoluble tantalate is the sole leachin...

而KOH濃度一定，溫度升高97精品视频共享总站，有利于生成偏鈮酸鉀黄色无码在线。浸出時間過長也將促使不溶性偏鈮酸鉀的形成。試驗條件下日韩福利国内主播在线观看，Ta2 O5在KOH高濃介質(zhì)體系中只得到不溶性的偏鉭酸鉀黄片黑人。Nb2 O5和Ta2 O5混合物的浸出規(guī)律與純Nb2 O5類似，鈮一级免费视频网站在线观看视频、鉭不能被選擇性地浸出情爱视频网址。

Proof of unbiasedness depends on our 4 assumptions – if any assumption fails, then OLS is not necessarily unbiased

無偏性的證明依賴于我們的四個假定--如果任何假定不成立，OLS未必是無偏的

Secondly, the paper carries on the destruction processes and the stress distribution situation numerical simulation of the concrete three point bending specimen with bias crack under static load function,, and analyze specimen crack expansion and the destruction mechanism, obtain the reason that the crack expanding flectional way is because the material nonuniformity, in the same time, from the specimen destruction process chart we can see that the crack bias degree has some influence on the crack expansion way.

其次論文對含偏置裂紋的混凝土三點彎曲試件在靜態(tài)載荷作用下的破壞過程和應(yīng)力分布情況進(jìn)行了數(shù)值模擬亚洲精品福利在线，并對試件的裂紋擴(kuò)展和破壞機(jī)理進(jìn)行了分析一级a片2018，得出裂紋擴(kuò)展的曲折性是由于材料不均勻性所引起的，同時從試件的破壞過程圖中可以看出www.人妻AV.com，裂紋的偏置程度對裂紋的擴(kuò)展路徑有一定的影響女生扒开腿让男人捅出白浆的动态图。

unbiased estimation：無偏估計

unbalanced 不平衡的 | unbiased estimation 無偏估計 | unbiasedness 無偏性

unbiased test：不偏檢定

"不偏估計量","unbiased estimator" | "不偏檢定","unbiased test" | "不偏性","unbiasedness"

unbiasedness：不偏性

Fisher在1930年左右提出評估統(tǒng)計量的標(biāo)準(zhǔn)方法為一致性 (Consistency),不偏性 (Unbiasedness) 及有效性 (Efficiency),并發(fā)展出目前標(biāo)準(zhǔn)尋求最佳統(tǒng)計量之最大概似估算法 (Maximum Likelihood Estimation);而卡爾皮爾森的兒子艾根皮爾森 (E.

Best unbiasedness：最小變異不偏性

Best shot bargaining games 最佳出擊談判賽局 | Best unbiasedness 最小變異不偏性 | Better-of-two option 較佳選擇權(quán)

Asymptotic unbiasedness：漸近不偏誤性

Asymptotic theory 漸近理論 | Asymptotic unbiasedness 漸近不偏誤性 | Asymptotic variance 漸近變異數(shù)

Unbiasedness condition：不偏條件

Unbiasedness 不偏性 | Unbiasedness condition 不偏條件 | Uncertainty 不確定性

median unbiasedness：中位數(shù)不偏性

中位數(shù)不偏信賴區(qū)間 median unbiased confidence interval | 中位數(shù)不偏性 median unbiasedness | 醫(yī)藥與公共衛(wèi)生統(tǒng)計學(xué) medical and public health statistics

risk unbiasedness：風(fēng)險不偏性

風(fēng)險集合 risk set | 風(fēng)險不偏性 risk unbiasedness | Robbins-Munro程序 Robbins-Munro procedure

unbiassed：無偏見的/公平的

unbiasedness /不偏性/ | unbiassed /無偏見的/公平的/ | unbidden /未奉命的/未受指使的/自愿的/未受邀請的/

Unbiased estimators：不偏估計式

Unbiased estimate 不偏估計量 | Unbiased estimators 不偏估計式 | Unbiasedness 不偏性