y25

1 Description
2 Syntax
3 Parameters
4 Return
5 Examples
6 Remark
7 See Also
8 header to Include
9 Reference

Description

Get the 25th percentile of vector.

Syntax

double y25( vector & vec )

Parameters

vec: [input] Origin C vector object

Return

Returns the 25th percentile of a vector.

Examples

EX1

// This is a self contained sample program for the function y25, 
// Its sample data is created at the beginning of the program. 
// To run the program, enter the following command in the Script window:
//   y25_ex1
// It returns like:
//   25th Percentile of Book1_B = 0.248345
void y25_ex1()
{ 
    Worksheet wks;
    wks.Create();
    Dataset myDs(wks, 1);   
 
    //******* Create sample data *****************
    myDs.SetSize(8);
    myDs[0]=0.3; 
    myDs[1]=0.097; 
    myDs[2]=0.41256;
    myDs[3]=0.24909;
    myDs[4]=0.47304;
    myDs[5]=0.2476;
    myDs[6]=0.64529;
    myDs[7]=0.44514;
    myDs.Sort(); 
    //******** End of Sample Data Creation ******* 
 
    vector vVal = myDs;
    double dY25 = y25(vVal);  // Demonstration of y25
 
    printf("25th Percentile of %s = %g\n", myDs.GetName(), dY25);
}

Remark

Let the $i\,$ th percentile be y, set $p=i/100\,$ , n is the number of data points, and let $np=(j+g) \,$

where j is the integer part of np, and g is the fractional part of np, then different methods define the $i^{th}\,$ percentile, y, as described by the following.