  Observability of state variables and parameters of a dynamical system from an
observed time series is analyzed and quantified by means of the Jacobian matrix
of the delay coordinates map. For each state variable and each parameter to be
estimated a measure of uncertainty is introduced depending on the current state
and parameter values, which allows us to identify regions in state and
parameter space where the specific unknown quantity can (not) be estimated from
a given time series. The method is demonstrated using the Ikeda map and the
Hindmarsh-Rose model.
