# How do I apply iteration method to an integral?

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Angie on 6 May 2024
Commented: Angie on 10 May 2024
Hello everyone,
I need to code an equation. That equation includes a new parameter that is not in my data, and therefore the parameter needs to be estimated/calculated before I can proceed.
There is a formula for the parameter, and the formula includes an integral, with the lowest limit being exactly that parameter I am trying to estimate. Therefore, that parameter is both on the left and on the right side of the equation. I am trying to figure out how to do it.
I think I understand the general idea. I need to use iterative method: make an initial guess, write a loop with the formula and it will converge to some value, which will be the final answer (please let me know if I am wrong)
I can’t figure out the steps I need to do. I’ve tried multiple things, but I couldn’t get it to run.
Here’s the formula:
• cdf is stored in stp.F;
• alpha is stored in mod.alpha;
• vector with q values : mod.vecq.

Alan Stevens on 6 May 2024
Look up help on function fzero.
Alan Stevens on 10 May 2024
Good!
Angie on 10 May 2024
Yes of course, I understand. But if at some point in the future someone has their own values and is looking for a solution to a similar problem hopefully the code can help them to move in the right direction. Thank you again, your pointer saved me a lot of headache :)