Bayesian Assignment

1) Implement the model from Steyvers, et al, 2003, Experiment 1. Skeleton code is provided in causal.m.

2) Run the model

a) Show output for when

i) gamma = 2.0, delta = 2.0

ii) gamma = 2.0, delta = 0.01

iii) gamma = 0.0, delta = 0.01

b) Explain what these two parameters do to model performance.

i) Point to the output of the model for examples.

c) Holding the parameters constant, take the average P(CC) for all trials of trial type 2 for the first and second blocks separately.

i) You might need to run the model a few times to make sure you get at least 2 examples of trial type 2 in each block.

ii) Do this for the parameters in 2.a.i and 2.a.ii.

iii) For a common set of parameters, are the means across blocks different?

(1) Why or why not.

(2) Relate this to the parameters used to produce the predictions.