JavaScript implementation of the Normal Probability Density Function

normal_pdf.js

// https://interactive.deolua.com/normal-dist

/*
*@param number 			x             - the value for which the probability value is desired
*@param number 			mean_val      - the value of the mean of the distribution
*@param number 			sd_val_sqrd   - the value of the SQUARE of the standard deviation of the distribution
*/

var pdf_formula = function(x, mean_val, sd_val_sqrd){
  var numer = (x - mean_val)**2;
  var denom = 2*sd_val_sqrd;
  
  var expon = numer/denom;
  
  var root_val = Math.sqrt(Math.PI * denom);
  
  return ( (1/root_val) * Math.exp(-expon));
};



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