EstimatedProcess
EstimatedProcess[data,proc] estimates the parametric process proc from data.
EstimatedProcess[data,proc,{{p,p0},{q,q0},…}] estimates the parameters p, q, … with starting values p0, q0, ….
EstimatedProcess[data,proc,iproc] estimates process proc with starting values taken from the instantiated process iproc.
Please visit the official Wolfram Language Reference for more details and examples on core symbols.