Model selection results for ISI of synthetic PCs.

Marginal likelihood of the first five models in the family for each data set, corresponding to the six different injected currents. Error bars on the log-marginal likelihoods are in S2 Table. Last column shows that a model with 4 completion paths is optimal over the combined data. Asterisk marks those cases where the optimal parameter values fell at the boundary of the search space, usually because there were paths with near-zero flux through them (see Materials and methods). Note that the numbers in the first two columns increase monotonically with M, so that the best model in the family is not found for M ≤ 5. We chose to truncate the exploration at M = 5 since we are interested in the overall maximum of the log-likelihood for all I, which is reached at M = 4 (last column).