Answer: extrapolate

AnswerCrossword Clue
EXTRAPOLATEPredict on basis of known data
extrapolateEstimate or conclude (something) in this way
extrapolateExtend the application of (a method or conclusion, esp. one based on statistics) to an unknown situation by assuming that existing trends will continue or similar methods will be applicable
extrapolateExtend (a graph, curve, or range of values) by inferring unknown values from trends in the known data
extrapolateto infer (values of a variable in an unobserved interval) from values within an already observed interval