# MCMC overview


FAQ:

Q: Why does first half of output look systematically different?

A: MCMC starts from random parameter combinations, and takes time to converge. Typically we discard first 50% of MCMC outputs

<img width="356" alt="image" src="https://user-images.githubusercontent.com/23563444/208981078-91bc8c55-c6de-407e-aff4-98e74aad02d7.png">
Figure 1: Example of full output, we discard first 50%.