misinterpolate

verb2

1. •
   To misestimate an interpolated data value.

   • These codes invariably misinterpolated the temperature values between two somewhat separated data transects, but did reasonably well in fitting the data close to the transects themselves. — 1975
2. •
   To insert or introduce an incorrect value into the middle of something else.

   • Indeed there are numerous instances during the composition of Finnegans Wake where the hapless typists, confused by Joyce's conventions, misinterpolated additions into the text. — 1999