add msm

Author: m-clark

README.md

@@ -32,6 +32,7 @@ two factor random effects [(R)](https://github.com/m-clark/Miscellaneous-R-Code/
 [multinomial regression](https://github.com/m-clark/Miscellaneous-R-Code/blob/master/ModelFitting/multinomial.R),
 [ordinal regression](https://github.com/m-clark/Miscellaneous-R-Code/blob/master/ModelFitting/ordinal_regression.R),
 [quantile regression](http://htmlpreview.github.io/?https://github.com/m-clark/Miscellaneous-R-Code/blob/master/ModelFitting/quantileRegression.html),
+[marginal structural model](https://github.com/m-clark/Miscellaneous-R-Code/blob/master/ModelFitting/ipw.R),
 [cubic spline](https://github.com/m-clark/Miscellaneous-R-Code/blob/master/ModelFitting/cubicsplines.R), 
 [hurdle poisson](https://github.com/m-clark/Miscellaneous-R-Code/blob/master/ModelFitting/hurdle.R), 
 [hurdle negbin](https://github.com/m-clark/Miscellaneous-R-Code/blob/master/ModelFitting/hurdle.R), 
@@ -51,7 +52,6 @@ hidden Markov model [(R)](https://github.com/m-clark/Miscellaneous-R-Code/blob/m
 [Gaussian Process noisy](https://github.com/m-clark/Miscellaneous-R-Code/blob/master/ModelFitting/gp%20Examples/gaussianprocessNoisy.R),
 [Gaussian Process noise-free](https://github.com/m-clark/Miscellaneous-R-Code/blob/master/ModelFitting/gp%20Examples/gaussianprocessNoiseFree.R), 
 [reproducing kernel hilbert space regression](https://github.com/m-clark/Miscellaneous-R-Code/blob/master/ModelFitting/RKHSReg/RKHSReg.md), 
-[stochastic volatility](https://github.com/m-clark/Miscellaneous-R-Code/blob/master/ModelFitting/stochasticVolatility.R),
 [extreme learning machine](https://github.com/m-clark/Miscellaneous-R-Code/blob/master/ModelFitting/elm.R),
 [Chinese restaurant process, Indian buffet process](https://github.com/m-clark/Miscellaneous-R-Code/blob/master/ModelFitting/crp.R), 
 [One-line models (an exercise)](https://github.com/m-clark/Miscellaneous-R-Code/blob/master/ModelFitting/one_line_models.R),
@@ -73,6 +73,7 @@ mixed model with beta response [(Stan)](https://github.com/m-clark/Miscellaneous
 [multilevel mediation](https://github.com/m-clark/Miscellaneous-R-Code/blob/master/ModelFitting/Bayesian/rstan_multilevelMediation.R), 
 [variational bayes regression](https://github.com/m-clark/Miscellaneous-R-Code/blob/master/ModelFitting/Bayesian/variationalBayesRegression.Rmd), 
 [gaussian process](https://github.com/m-clark/Miscellaneous-R-Code/blob/master/ModelFitting//gp%20Examples/gaussianProcessStan.Rmd),
+[stochastic volatility](https://github.com/m-clark/Miscellaneous-R-Code/blob/master/ModelFitting/Bayesian/stochasticVolatility.R),
 [horseshoe prior](https://github.com/m-clark/Miscellaneous-R-Code/blob/master/ModelFitting/Bayesian/horseshoe/README.md),
 [item response theory](https://github.com/m-clark/Miscellaneous-R-Code/blob/master/ModelFitting/Bayesian/StanBugsJags/IRT_models), ...