On the recordRead 5 Oct 202613 facts
BXA
Plans and prices
BXA
Free
Free software under GNU GPL v3 or later
Read 5 Oct 2026 · github.com
On the record
- Automated fitting
- The fitting algorithm explores parameter spaces without requiring good starting points and runs until convergence.johannesbuchner.github.io · read 5 Oct 2026
- Installation
- BXA can be installed with pip or conda and requires either Sherpa or Xspec to be installed and configured.johannesbuchner.github.io · read 5 Oct 2026
- Intended use
- The documentation highlights systematic analysis of large datasets, comparing multiple models, and analyzing low-count datasets with realistic models.johannesbuchner.github.io · read 5 Oct 2026
- Model comparison
- It computes model evidence for Bayes factors and supports comparing models that are not nested.johannesbuchner.github.io · read 5 Oct 2026
- Model discovery
- It provides Quantile-Quantile plots to visualize deviations between a model and data without binning.johannesbuchner.github.io · read 5 Oct 2026
- Notable change
- In version 5, Xspec priors use soft parameter limits instead of hard parameter limits, which the release notes flag as a potentially breaking change.johannesbuchner.github.io · read 5 Oct 2026
- Parallel processing
- MPI parallelisation can scale inference from laptops to computing clusters when mpi4py is installed.johannesbuchner.github.io · read 5 Oct 2026
- Parameter estimation
- It estimates parameters in arbitrary dimensions, finds best fits, computes error bars and marginal probability distributions, and supports MPI parallelisation.johannesbuchner.github.io · read 5 Oct 2026
- Purpose
- BXA connects Xspec and Sherpa X-ray spectral analysis environments to UltraNest for Bayesian parameter estimation and model comparison.johannesbuchner.github.io · read 5 Oct 2026
- Security and warranty
- The repository publishes a GNU GPL license whose text disclaims warranties for the program.github.com · read 5 Oct 2026
- Support
- The project directs users to file bug reports and feedback as GitHub issues and asks bug reports to include operating system, Sherpa or Xspec version, setup details, and reproduction steps.johannesbuchner.github.io · read 5 Oct 2026
- Supported systems
- BXA runs on operating systems supported by CIAO/Sherpa or HEASoft/Xspec, while release testing is stated to cover Ubuntu Linux only.johannesbuchner.github.io · read 5 Oct 2026
- Xspec compatibility
- When run from pyxspec, BXA provides chain FITS files compatible with Xspec/pyxspec MCMC features and error propagation tools.johannesbuchner.github.io · read 5 Oct 2026
