stochastic volatility likelihood inference and comparison with arch models
求这篇文章，有人有的话，可以发我一下吗？fengzi50509@163.com

the expression X ~ N (mu,variance=1/tau)
in WinBUGS language is written as
      x~dnorm(mu,tau)
where tau is the precision parameter.
Note that in WinBUGS , the normal distribution is
defined using its precision parameter,
not its variance or standard deviation.