Would appreciate your clarification of the following issues that seem confusing.

In the documentation (eg, p.29 of cmdstan-guide-2.19.1.pdf), the reported `divergent__`

row has the `NEff`

equal to the `1000`

iternations saved (but in my case below, I have `-nan`

) and also `Rhat = nan`

(my case: `9.99e-01`

). **Are these NEff and Rhat, in either case, meaningful at all?**

The `Mean`

in my case is non-zero but very small (`5.00e-03`

). Is this merely due to **trying to report an integer value in floating point?** (In other words, that reported value should be taken as `0`

.)

```
Inference for Stan model: SSM0_5_2dev_model
4 chains: each with iter=(400,400,400,400); warmup=(0,0,0,0); thin=(1,1,1,1); 1600 iterations saved.
Warmup took (7133, 7125, 7429, 6727) seconds, 7.89 hours total
Sampling took (3443, 3584, 3725, 3661) seconds, 4.00 hours total
Mean MCSE StdDev 5% 50% 95% N_Eff N_Eff/s R_hat
lp__ 2.07e+04 5.76e-01 1.39e+01 2.07e+04 2.07e+04 2.07e+04 5.82e+02 4.04e-02 1.00e+00
accept_stat__ 9.62e-01 2.75e-03 8.83e-02 8.48e-01 9.88e-01 9.99e-01 1.03e+03 7.16e-02 1.01e+00
stepsize__ 1.79e-02 6.50e-04 9.20e-04 1.69e-02 1.79e-02 1.94e-02 2.00e+00 1.39e-04 5.60e+13
treedepth__ 9.00e+00 5.04e-03 1.98e-01 9.00e+00 9.00e+00 9.00e+00 1.55e+03 1.08e-01 1.00e+00
n_leapfrog__ 5.46e+02 3.59e+00 1.34e+02 5.11e+02 5.11e+02 1.02e+03 1.39e+03 9.63e-02 1.02e+00
divergent__ 5.00e-03 -nan 7.06e-02 0.00e+00 0.00e+00 0.00e+00 -nan -nan 9.99e-01
energy__ -2.05e+04 8.28e-01 1.91e+01 -2.06e+04 -2.05e+04 -2.05e+04 5.30e+02 3.68e-02 1.01e+00
sd_y 8.01e-02 1.35e-05 5.74e-04 7.91e-02 8.01e-02 8.10e-02 1.80e+03 1.25e-01 9.98e-01
mu_u1 1.02e-01 1.99e-04 8.99e-03 8.65e-02 1.02e-01 1.16e-01 2.03e+03 1.41e-01 1.00e+00
mu_alpha 4.17e-02 4.61e-05 1.86e-03 3.87e-02 4.18e-02 4.47e-02 1.63e+03 1.13e-01 9.99e-01
beta 5.93e-01 1.87e-04 7.52e-03 5.80e-01 5.93e-01 6.05e-01 1.62e+03 1.12e-01 1.00e+00
theta 1.53e-01 7.81e-05 3.24e-03 1.48e-01 1.53e-01 1.59e-01 1.71e+03 1.19e-01 1.00e+00
sd_season 1.02e-01 1.03e-04 4.25e-03 9.46e-02 1.01e-01 1.09e-01 1.70e+03 1.18e-01 1.00e+00
mu_season[1] -1.26e-01 2.23e-04 1.05e-02 -1.44e-01 -1.26e-01 -1.09e-01 2.20e+03 1.53e-01 1.00e+00
mu_season[2] -7.06e-02 2.23e-04 1.02e-02 -8.78e-02 -7.04e-02 -5.45e-02 2.07e+03 1.44e-01 1.00e+00
mu_season[3] 1.46e-01 2.42e-04 1.03e-02 1.28e-01 1.46e-01 1.63e-01 1.82e+03 1.27e-01 1.00e+00
p[1] 6.45e-01 1.07e-03 3.83e-02 5.98e-01 6.38e-01 7.19e-01 1.27e+03 8.81e-02 1.00e+00
p[2] 6.27e-01 1.20e-04 5.35e-03 6.18e-01 6.27e-01 6.36e-01 1.98e+03 1.37e-01 9.99e-01
p[3] 5.97e-01 1.54e-03 5.48e-02 5.30e-01 5.87e-01 7.04e-01 1.27e+03 8.79e-02 1.00e+00
g[1] 8.36e-01 1.09e-03 4.36e-02 7.65e-01 8.36e-01 9.10e-01 1.62e+03 1.12e-01 1.00e+00
g[2] 3.37e-01 5.20e-04 2.02e-02 3.05e-01 3.37e-01 3.71e-01 1.51e+03 1.05e-01 1.00e+00
w[1] 7.33e-01 1.53e-03 6.31e-02 6.24e-01 7.34e-01 8.35e-01 1.70e+03 1.18e-01 9.99e-01
w[2] 1.41e-01 3.11e-04 1.26e-02 1.20e-01 1.41e-01 1.62e-01 1.66e+03 1.15e-01 9.99e-01
w[3] 5.94e-01 4.87e-04 1.95e-02 5.61e-01 5.94e-01 6.25e-01 1.60e+03 1.11e-01 9.99e-01
d[1] 6.68e-02 2.74e-04 1.07e-02 4.91e-02 6.69e-02 8.42e-02 1.54e+03 1.07e-01 1.00e+00
d[2] 6.98e-01 2.17e-04 9.15e-03 6.83e-01 6.98e-01 7.13e-01 1.78e+03 1.23e-01 9.99e-01
d[3] 2.35e-01 2.62e-04 1.10e-02 2.17e-01 2.35e-01 2.53e-01 1.78e+03 1.23e-01 1.00e+00
```