Update README.md

Author: davidemezzadri

README.md

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 Implementation of Gibbs sampling to estimate the posterior distribution of the parameters of two different Bayesian hierarchical models (in the context of educational setting).
 - gibbs_without7.ipynb ---> model without covariates
 - gibbs_with7.ipynb ---> model with covariates
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 In addition, there are basic diagnostics of the convergence of the algorithms: trace plots and auto-correlation functions.