
Advanced Statistics Advanced Probability and Statistics Math Forum 
 LinkBack  Thread Tools  Display Modes 
April 18th, 2017, 03:15 AM  #1 
Newbie Joined: Apr 2017 From: Andhra Pradesh, India Posts: 2 Thanks: 0  Inverse of sum of error functions
How to find the inverse function of f(x)=sum_{i=0}^{4} Ai[1+erf((xbi)/ci)] 
April 18th, 2017, 03:31 AM  #2 
Senior Member Joined: Feb 2016 From: Australia Posts: 1,734 Thanks: 605 Math Focus: Yet to find out.  
April 19th, 2017, 11:13 PM  #3 
Newbie Joined: Apr 2017 From: Andhra Pradesh, India Posts: 2 Thanks: 0 
The exact function is f(x)=sgn(x)\sqrt[d]{u\sum\limits_{i=1}^{4} \frac{\sqrt{\pi}a_i c_i}{2} [1+erf(\frac{xb_i}{c_i})]} where d and u are positive constants. x is a complex random variable with magnitudes in the range [0,1]. The exact values are a1 = 0.19; b1 = 0.2512; c1 = 0.003164; a2 = 0.1; b2 = 0.1142; c2 = 0.006324; a3 = 0.14; b3 = 0.3322; c3 = 0.003054; a4 = 0.02778; b4 = 0.2211; c4 = 0.151;


Tags 
error, functions, inverse, sum 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Convergent Sequence of Functions with NonZero Mean Square Error  v8archie  Calculus  4  August 18th, 2014 03:17 AM 
Error with Moment Generating Functions  Relmiw  Advanced Statistics  2  February 13th, 2012 03:57 PM 
Integrating product of exponential and error functions  hateqq  Calculus  0  October 29th, 2010 12:28 AM 
Implications and the "inverse error" fallacy  ElMarsh  Applied Math  10  May 13th, 2009 12:12 PM 
An error on functions and powersets, in a Dover book?  farleyknight  Abstract Algebra  2  February 15th, 2008 06:22 PM 