Stochastic Volatility Model does not always converge

Modeling
6

While truncating parameters is discouraged, the <lower=0> isn’t a truncation, it just means that it samples a transformation of the parameters that does not allow the sampled values to be smaller than zero. See this section of the manual for more info: https://mc-stan.org/docs/2_24/reference-manual/lower-bound-transform-section.html

Truncations are implemented using the T[,] syntax, like so:

y ~ normal(mu, sigma) T[0,];

But as you know, are discouraged

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