extrapolate

verb

• extend the application of (a method or conclusion, especially one based on statistics) to an unknown situation by assuming that existing trends will continue or similar methods will be applicable:the results cannot be extrapolated to other patient groups [no object]:it is always dangerous to extrapolate from a sample
• estimate or conclude (something) by extrapolating:attempts to extrapolate likely human cancers from laboratory studies
• Mathematics extend (a graph, curve, or range of values) by inferring unknown values from trends in the known data: (as adjective extrapolated)a set of extrapolated values