effectiveSampleSize: Compute the effective sample size (ESS) of the particles.
In serrsBayes: Bayesian Modelling of Raman Spectroscopy

The ESS is a "rule of thumb" for assessing the degeneracy of the importance distribution:

ESS = \frac{(∑_{q=1}^Q w_q)^2}{∑_{q=1}^Q w_q^2}

1	effectiveSampleSize(log_weights)

log_weights

logarithms of the importance weights of each particle.

the effective sample size, a scalar between 0 and Q

Liu, JS (2001) "Monte Carlo Strategies in Scientific Computing." Springer, NY, pp. 34–36.

1 2	x <- runif(100) effectiveSampleSize(log(x))

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