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We have shown that our methodology can both quantify and dramatically reduce the Monte Carlo error pay day loans computationally intensive inferences for POMP models. The MCAP procedure therefore improves the accessibility and scalability of inference for nonlinear pay day loans models. Spatio-temporal data consists of time series collected at various locations. Thus, this class of inference challenges stands to benefit from our MCAP methodology.


The electronic supplementary material, Section S1, presents an example for fitting a coupled spatio-temporal model to measles incidence in twenty cities.


We look for a numerically convenient toy scenario that generates Monte Carlo profiles resembling figures 2 and 3. The lognormal distribution leads to log-likelihood profiles that deviate from quadratic. To set up a situation with Monte Carlo error in evaluating and maximizing the likelihood, we supposed that the likelihood is accessed via Monte Carlo integration of a latent variable.


Then, our Monte Carlo density estimator is 5. We suppose that we are working with a parallel random number generator such that pseudo-random sequences corresponding to different seeds behave numerically like independent random sequences.


Our Monte Carlo log-likelihood estimator is 5. Seed fixing is an effective technique for removing Monte Carlo variability from relatively small calculations, but can become difficult or impossible to implement effectively for complex, coupled, nonlinear systems. There are two ways to increase the Monte Carlo error in the log likelihood for this toy example, by increasing the sample size, N, and decreasing the Monte Carlo effort, J. The Monte Carlo variance of the log-likelihood estimate increases linearly with N, but at the same time the curvature of the log likelihood increases and, within the inferentially relevant region, the profile log likelihood becomes increasingly close to quadratic.


Thus, in the context of our methodology, increasing N actually makes inference easier despite the increasing Monte Carlo noise. This avoids a paradoxical difficulty of Monte Carlo inference for big data: more data should be a help for a statistician, not a hindrance. Decreasing J represents a situation where Monte Carlo variability increases without increasing information about the parameter of interest.


In this case, the Monte Carlo variability and the Monte Carlo bias online loans on the log likelihood due to Jensen's inequality both increase. Also, likelihood maximization becomes more erratic for small J since the maximization error due to the fixed seed becomes more important.


However, figure 4 shows that, even when there is considerable bias and variance in the Monte Carlo profile evaluations, the Monte Carlo profile confidence intervals can be little wider than the exact interval.


Profile construction for the toy model. Points show Monte Carlo profile evaluations. The quadratic approximation used to calculate the MCAP profile cut-off is shown as a dotted blue line.



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