Rayleigh distribution

• What Is the Difference Between the Rician and Gaussian Distributions?
  A Rician variable is the magnitude of a Gaussian vector with a possible nonzero mean; compare its support, density, limiting cases, and uses.
• What Is the Fisher Information of the Rayleigh Distribution?
  For the standard Rayleigh scale parameter, one observation has Fisher information 4 divided by sigma squared; n independent observations have 4n divided by sigma squared.