# 统计分布函数

统计分布函数返回给定输入变量的不同可能结果的发生概率。可以使用这些函数计算数据点的潜在价值。

以下描述的三组统计分布函数都是通过使用 Cephes 函数库在 Qlik Sense 中执行。有关所用算法、精确度等的参考及详情，请访问：[Cephes library](http://www.netlib.org/cephes/)。Cephes 函数库经获得许可使用。

* 概率函数计算分布中由提供的值给出的点上的概率。

  * 频率函数用于离散分布。

  * 密度函数用于连续函数。

* Dist 函数计算分布中由提供的值给出的点上的分布累积概率。

* Inv 函数用于在给定分布的累积概率的情况下计算反值。

所有函数均可用于数据加载脚本和图表表达式。

使用每个函数的下拉列表可查看每个函数的简短描述和语法。单击语法描述中的函数名称可了解更多信息。

[](https://help.qlik.com/en-US/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/statistical-distribution-functions.htm)

#### BetaDensity

`BetaDensity()` 返回 Beta 概率分布。

[**BetaDensity**](https://help.qlik.com/zh-CN/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/BetaDensity.htm)(value, alpha, beta)

[](https://help.qlik.com/en-US/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/statistical-distribution-functions.htm)

#### BetaDist

`BetaDist()` 返回累计 Beta 概率分布。

[**BetaDist**](https://help.qlik.com/zh-CN/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/BetaDist.htm)(value, alpha, beta)

[](https://help.qlik.com/en-US/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/statistical-distribution-functions.htm)

#### BetaInv

`BetaINV()` 返回累计 Beta 概率分布的倒数。

[**BetaInv**](https://help.qlik.com/zh-CN/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/BetaInv.htm)(prob, alpha, beta)

[](https://help.qlik.com/en-US/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/statistical-distribution-functions.htm)

#### BinomDist

`BinomDist()` 返回累计二项式概率分布。

[**BinomDist**](https://help.qlik.com/zh-CN/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/BinomDist.htm)(value, trials, trial\_probability)

[](https://help.qlik.com/en-US/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/statistical-distribution-functions.htm)

#### BinomFrequency

`BinomFrequency()` 用于返回二项式概率分布。

[**BinomFrequency**](https://help.qlik.com/zh-CN/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/BinomFrequency.htm)(value, trials, trial\_probability)

[](https://help.qlik.com/en-US/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/statistical-distribution-functions.htm)

#### BinomInv

`BinomInv()` 返回累计二项式概率分布的倒数。

[**BinomInv**](https://help.qlik.com/zh-CN/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/BinomInv.htm)(prob, trials, trial\_probability)

[](https://help.qlik.com/en-US/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/statistical-distribution-functions.htm)

#### ChiDensity

`ChiDensity()`返回 chi^2^ 分布的单尾概率。chi^2^ 密度函数与 chi^2^ 检测相关联。

[**ChiDensity**](https://help.qlik.com/zh-CN/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/ChiDensity.htm)(value, degrees\_freedom)

[](https://help.qlik.com/en-US/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/statistical-distribution-functions.htm)

#### ChiDist

`ChiDist()`返回 chi^2^ 分布的单尾概率。chi^2^ 分布与 chi^2^ 检测相关联。

[**ChiDist**](https://help.qlik.com/zh-CN/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/ChiDist.htm)(value, degrees\_freedom)

[](https://help.qlik.com/en-US/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/statistical-distribution-functions.htm)

#### ChiInv

`ChiInv()` 用于返回单尾 chi^2^ 分布概率的相反值。

[**ChiInv**](https://help.qlik.com/zh-CN/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/ChiInv.htm)(prob, degrees\_freedom)

[](https://help.qlik.com/en-US/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/statistical-distribution-functions.htm)

#### FDensity

`FDensity()` 返回 `F` 概率分布。

[**FDensity**](https://help.qlik.com/zh-CN/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/FDensity.htm)(value, degrees\_freedom1, degrees\_freedom2)

[](https://help.qlik.com/en-US/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/statistical-distribution-functions.htm)

#### FDist

`FDist()` 返回累计 `F` 概率分布。

[**FDist**](https://help.qlik.com/zh-CN/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/FDist.htm)(value, degrees\_freedom1, degrees\_freedom2)

[](https://help.qlik.com/en-US/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/statistical-distribution-functions.htm)

#### FInv

`FInv()` 返回累计 `F` 概率分布的倒数。

[**FInv**](https://help.qlik.com/zh-CN/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/FInv.htm)(prob, degrees\_freedom1, degrees\_freedom2)

[](https://help.qlik.com/en-US/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/statistical-distribution-functions.htm)

#### GammaDensity

`GammaDensity()` 返回 Gamma 概率分布。

[**GammaDensity**](https://help.qlik.com/zh-CN/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/GammaDensity.htm)(value, k, θ)

[](https://help.qlik.com/en-US/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/statistical-distribution-functions.htm)

#### GammaDist

`GammaDist()` 返回累计 Gamma 概率分布。

[**GammaDist**](https://help.qlik.com/zh-CN/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/GammaDist.htm)(value, k, θ)

[](https://help.qlik.com/en-US/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/statistical-distribution-functions.htm)

#### GammaInv

`GammaInv()` 返回累计 Gamma 概率分布的倒数。

[**GammaInv**](https://help.qlik.com/zh-CN/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/GammaInv.htm)(prob, k, θ)

[](https://help.qlik.com/en-US/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/statistical-distribution-functions.htm)

#### NormDist

`NormDist()` 用于返回指定方式及标准误差的累积正态分布。如果 mean = 0 和 standard\_dev = 1，则此函数返回标准正态分布。

[**NormDist**](https://help.qlik.com/zh-CN/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/NormDist.htm)(value, mean, standard\_dev)

[](https://help.qlik.com/en-US/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/statistical-distribution-functions.htm)

#### NormInv

`NormInv()` 用于返回指定方式及标准误差的累积正态分布的相反值。

[**NormInv**](https://help.qlik.com/zh-CN/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/NormInv.htm)(prob, mean, standard\_dev)

[](https://help.qlik.com/en-US/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/statistical-distribution-functions.htm)

#### PoissonDist

`PoissonDist()` 返回累计泊松概率分布。

[**PoissonDist**](https://help.qlik.com/zh-CN/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/PoissonDist.htm)(value, mean)

[](https://help.qlik.com/en-US/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/statistical-distribution-functions.htm)

#### PoissonFrequency

`PoissonFrequency()` 用于返回泊松概率分布。

[**PoissonFrequency**](https://help.qlik.com/zh-CN/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/PoissonFrequency.htm)(value, mean)

[](https://help.qlik.com/en-US/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/statistical-distribution-functions.htm)

#### PoissonInv

`PoissonInv()` 返回累计泊松概率分布的倒数。

[**PoissonInv**](https://help.qlik.com/zh-CN/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/PoissonInv.htm)(prob, mean)

[](https://help.qlik.com/en-US/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/statistical-distribution-functions.htm)

#### TDensity

`TDensity()` 返回学生的 `t` 密度函数的值，其中数值是要对其计算概率的 `t`的计算值。

[**TDensity**](https://help.qlik.com/zh-CN/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/TDensity.htm)(value, degrees\_freedom, tails)

[](https://help.qlik.com/en-US/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/statistical-distribution-functions.htm)

#### TDist

`TDist()` 用于返回学生 `t` 分布的概率，其中数值是一个将要为其计算概率的 `t` 的计算值。

[**TDist**](https://help.qlik.com/zh-CN/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/TDist.htm)(value, degrees\_freedom, tails)

[](https://help.qlik.com/en-US/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/statistical-distribution-functions.htm)

#### TInv

`TInv()` 用于作为一个概率和自由度函数返回学生 `t` 分布的 `t` 值。

[**TInv**](https://help.qlik.com/zh-CN/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalDistributionFunctions/TInv.htm)(prob, degrees\_freedom)

## 了解详情

* [统计聚合函数](https://help.qlik.com/zh-CN/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StatisticalAggregationFunctions/statistical-aggregation-functions.htm)