Fisher matrices are used frequently in the analysis of combining cosmological constraints from various data sets. They encode the Gaussian uncertainties of multiple variables. They are simple to use, and I show how to get up and running with them quickly. Python software is also provided. I cover how to obtain confidence ellipses, add datasets, apply priors, marginalize, transform variables, and even calculate your own Fisher matrices. This treatment is not new, but I aim to provide a clear and concise reference guide. I also provide references and links to more sophisticated treatments and software.
- Pub Date:
- June 2009
- Astrophysics - Instrumentation and Methods for Astrophysics;
- Astrophysics - Cosmology and Extragalactic Astrophysics
- 4 pages, 1 figure, not submitted to any journal. Comments welcome. Software will be made available at http://www.its.caltech.edu/~coe/Fisher