Common problems in astrophysics

• Characterising a source
• Spectral lines, pulsation frequencies
• Orbital parameters
• Learn physical parameters
• Comparing physical effects
• Include a mechanism or not. 0, 1 or 2 planets?
• Is the distribution a log-normal, a powerlaw or a broken powerlaw?
• Characterising a population of sources
• Intrinsic distribution behind measurements
• Luminosity functions
• Population demographic behind drawn sample