are observed nodes fixed or stochastic what is the variable for the factor potential in pmc? what is a variable that is fixed in psymc what is the variable obs in mc weibull is obs a stochastic node which factor potential is only changeable? is the observed node a stochastic variable is a birth an observed node in pymc which factor potential is fixed what is the condition of the observed node is a period node a fixed or stochastic node can the observed node be stochastic what is the only changeable variable in peymc? is the variable birth fixed in pymc? which factor potential is only changeable why is obs a static variable on pymc is birth a fixed factor potential why is obs a stochastic node in psyc are observed nodes fixed are pymc observed nodes stochastic