Bayesian-Poll-of-Polls

Stan code for creating a Bayesian poll of polls for multiparty systems

How to use

The stan model expects the following data:

• T: an integer representing the total number of time steps in the model
• J: an integer representing the total number of parties in the model
• N: integer number of observations in the data (not necessarily the same as T)
• P: integer number of unique pollsters
• t: integer time step for each observation. Assumed to go from 1 to T.
• vi: N by J matrix of poll results. Set to -1 if a party is missing.
• pollster: integer id for the pollster of each observation. Should range from 1 to P
• size: vector of sample sizes for each poll
• vote0: vector used to initialize the state variable; should contain one value per party and sum to 1

Once you have the data in this format, you can compile and run the code with your preferred Stan interface. I have a couple of examples that use cmdstanr to produce graphs from Europe Elects polling data in the scripts folder.