Changes

*This function will return the result as error when  

*This function will return the result as error when  

  1.Any one of the value is nonnumeric.

  1.Any one of the value is nonnumeric.

  2.Any value of <math> pr \le 0 or pr >1

  2.Any value of <math> pr \le 0 </math> or pr >1

  3.the values in the given pr  do not adding  up to 1

  3.the values in the given pr  do not adding  up to 1

  4.xr and pr is of different number of data points.

  4.xr and pr is of different number of data points.

==Examples==

==Examples==