Results 1 to 3 of 3

Thread: Urgent! Parameter fitting;Reed-Frost

  1. #1
    Apr 2005

    Urgent! Parameter fitting;Reed-Frost

    The following equation is a function for parameterfitting in the Reed-Frost epidemiological

    model, but acquaintance with the model is not a necessity, i just need help in figuring out

    how to approximate the parameter q in the following equation:

    (sum (from t=0 to n-1) of C(t)C(t+1)q^C(t)/q(1-q^C(t)))-(sum (from t=0 to n-1) of

    C(t)S(t+1)/q = 0

    where C(t) and S(t) are discrete functions

    The equation can also be seen in the following link:

    You can contact me,, if you are unsure how to interpreat the equation.

    Matlab and maple are at my disposal.

    If you know a method for solving this problem i would be really greatful!

    This question is posted in other areas of this forum because i do not know the category of the problem, sorry!
    Follow Math Help Forum on Facebook and Google+

  2. #2
    hpe is offline
    Member hpe's Avatar
    Apr 2005
    Hello -

    this is just a nonlinear equation for q. Thus it can be solved numerically with any derivative free rootfinding method, e.g. with the bisection method (the simplest choice) or with Brent's method. The latter is implemented in Matlab as fzero.m, see documentation .

    Note that you can multiply the entire equation with q, then the second sum does not depend on q.

    Hope this helps!
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Apr 2005

    Thank you very much!

    Thank you hpe, it was a great help, helped our project procede!
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. hypothesis testing: parameter 0 against parameter positive.
    Posted in the Advanced Statistics Forum
    Replies: 0
    Last Post: Feb 10th 2011, 02:49 PM
  2. Curve Fitting
    Posted in the Calculus Forum
    Replies: 8
    Last Post: Sep 15th 2010, 02:09 PM
  3. Coding theory - reed muller code
    Posted in the Discrete Math Forum
    Replies: 0
    Last Post: Oct 13th 2009, 04:06 AM
  4. Reed Solomon & Galios
    Posted in the Advanced Algebra Forum
    Replies: 3
    Last Post: Jan 1st 2007, 06:13 PM

Search Tags

/mathhelpforum @mathhelpforum