正态分布函数

The 8087 s instructions are estimated with beta distribution and normal distribution separately, the whole program s execution time is approximated with normal distribution after adding instruction.

分别用贝塔分布和正态分布模拟8087指令的运行时间，进行指令叠加后用正态分布模拟整个程序的运行时间；实验结果表明，基于分布函数的程序执行时间预估方法是可行的；最后对估计出来的时间区间作了调整。

Normal distribution in statistics is based on the probability density function in the form of representation, and set up a continuous random variable X, the probability density function f has the form of Figure 1, where a, b are constants and were known as the average value and standard deviation,π, e, respectively pi and natural constants, claimed that X subject to parameters a, b of the normal distribution.

正态分布在统计学中是以概率密度函数的形式表述的，设连续型随机变量X的概率密度函数f有图1中的形式，其中a、b为常数，分别被称为平均值和标准差，π、e 分别为圆周率和自然常数，则称X服从参数为a，b的正态分布。

These factors were normalized and divided into different degrees according to the probability density function of the normal distribution.

在建模过程中，对每个指标进行了正态化转化和正态性检验，并利用正态分布概率密度函数确立了各指标数年一遇的等级标准。

General assumptions probability density function is normal, because normal mathematical better foundation.

一般假设概率密度函数是正态分布，因为正态分布数学基础较好。

For the first time, a checking point method is proposed by using equivalent logarithmic normal probability distribution, and its application is studied for calculating durability reliability of reinforced concrete structures.

根据在役结构的特点，提出了用对数正态分布拟合未知概型的随机变量的方法；首次提出了当量对数正态型概率分布的验算点法，并研究了其在钢筋混凝土结构耐久性可靠度中的应用；对功能函数非线性引起的误差进行了深入的研究，提出了误差判别方法。

It was observated that the movement of oil drop impacted by air molecule in Millikan experiment. Displacement distribution and measurement error functions accord with gaussian distribution by studying of histogram.

用密立根实验装置，观测油滴在空气分子撞击下运动，通过直方图研究说明位移分布函数φ符合正态分布，测量误差分布也服从正态分布。

Results show that salt content in farmlands meet to normal distribution and its spatial structure meet to a penta spherical function.

结果表明，该地区在微咸水灌溉条件下，土壤含盐量服从正态分布，其空间结构符合 5次球状函数；地下水含盐量服从对数正态分布，其空间结构符合 3次球状函数。

In the article we at first discuss the kind of stock log-return distribution. We find that 7 kinds function can describe stock log-return form their works: Gausses of normal distribution, Levy distribution, t distribution, spike attitude distribution, random fluctuating model, ARCH-GARCH model, divide shape Brownian movement .

本文首先讨论了股票收益分布的种类，作者对前人的工作综合发现目前描述股票收益的函数大概有七种：高斯正态分布、利维稳定分布、t标度分布、尖峰态分布、随机波动率模型、ARCH—GARCH模型、分形布朗运动，我们分别对这七种函数进行了简要的介绍。

The probability distribution function and the corresponding statistical parameters of sharing ratio of internal pressure in bedrock for embedded penstocks in terms of design reference per.

根据已搜集到的国内外部分水电站地下埋管围岩内压分担率的实测数据，利用统计数学中的K-S法和A-D法等检验方法进行了统计分析和分布假设检验，求得了水电站地下埋管围岩内压分担率在设计基准期内的概率分布函数及其统计参数，证明其最优概率分布函数可用对数正态分布来拟合。

Firstly, we test that the error data are not normal distribution, and even the expectation is not zero. Then we analyze the possible type distribution of these error data. Finally, we use the stepwise method to fit the error data and obtain a function for some parameters of the SAIL model. As prior knowledge, the fitting function will be used to inverse these parameters ofthe SAIL model soon.

首先检验了误差数据不服从正态分布，甚至均值不为零；然后对误差数据可能服从的分布类型给予了解析，得到了指数分布和混合正态分布两种不同类型的可能分布；最后拟合了误差关于SAIL模型部分参数的函数表达式，以作为先验知识应用于反演之中。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。