gasurv2
Calculates max likelihood estimates using a genetic algorithm for bivariate data
Contents
Syntax
[q, info, endPop, bPop, traceInfo] = gasurv2(func, p, t, y, Z)
Description
Calculates max likelihood estimates using a genetic algorithm for bivariate data
Input
- func: string with name of user-defined function
f = func (p, t, y) with p: np-vector; t: nt-vector; y: ny-vector f: (nt,ny)-matrix with model-predictions for surviving numbers
- p: (np,2) matrix with
p(:,1) initial guesses for parameter values p(:,2) binaries with yes or no iteration (optional)
- t: (nt,1)-vector with first independent variable (time)
- y: (ny,1)-vector with second independent variable
- Z: (nx,ny)-matrix with surviving numbers
Output
- q: matrix like p, but with ml-estimates
- info: 1 if convergence has been successful; 0 otherwise
- endPop: the final population: individual in each row; last column is minus weighted sum of squares
- bPop: a trace of the best population
- traceInfo: a matrix of best and means of the ga for each generation
Remarks
Set options with garegr_options. Similar to nrsurv, but slower and a larger bassin of attraction.
Modified from gaot package version 1996/02/02: C.R. Houck, J.Joines, and M.Kay. A genetic algorithm for function optimization: A Matlab implementation. ACM Transactions on Mathmatical Software, Submitted 1996; binary and order options removed gasurv calls for: User-defined function: 'func'
Crossover Operators: simplexover heuristicxover arithxover Mutation Operators: boundarymutation multiMonUnifMutation nonUnifMutation unifMutation Selection Functions: normgeomselect roulette tournselect Utility functions: cat Option setting: garegr_options
Example of use
See mydata_surv2