Creates a Chisq distribution object (Continuous Distribution).

If the random variables Xi, i=1,2,,...,k are normally and independently distributed with means meani and variances sigmai^2, then U=Sum of ((Xi-meani)/sigmai)^2 from i=1 to k has a chi-square distribution with k degrees of freedom.

Thus in words the sum of squares of independent standard normal random variables has a chi-square distribution with degrees of freedom equal to the number of terms in the sum.

The string 'Key' resulting from a successful construction of this distribution object can be passed to the following functions in order to query (mean, std deviation and variance) or execute functions (probability density function, cumulative density function etc...) based on this distribution object : CDistributionMean(), CDistributionVar(), CDistributionSTD(), CDistributionPDF(), CDistributionCDF(), CDistributionICDF() or CDistHazard(). In addition, the string 'Key' resulting from a successful construction of this distribution object will also allow you to construct a process generator object via a call to PGChisqDistribution(). A process generator object allows you to generate large amounts of random numbers based on this distribution.

Even though PGChisqDistribution() is the process generator object, the function RandomChisq() is the actual function that obtains the random numbers given a count parameter and the process generator string 'key'.

This function creates an object and returns a string-key value to represent this created object.
The TAG value of the string-key returned (second part of the key) is : "Chisq"

String CTStatDistributions.ChisqDistribution( _
String Key, _
Long Reload, _
Long DF)

=CT.STAT.ChisqDistribution(
Excel String Cell Key,
Excel Numeric Cell Reload,
Excel Numeric Cell DF)

static std::string ChisqDistribution(
std::string Key,
long Reload,
long DF);

System.String CTStatDistributionsSA.ChisqDistribution(
System.String Key,
System.Int32 Reload,
System.Int32 DF);

The C# example below contains all the sub-function calls leading up to this function call. As a result, the example can contain a lot of code.

The VB.NET, J#, C++.NET, Java, Excel VBA, Visual Basic 6 (via COM) and C++ examples below contain function code stubs for the calls leading up to this function call. However, the function call for this function is displayed.
You can easily reproduce the stub functions code from the C# example.