Confidence limits for the abscissa of intersection of two linear regressions

A method to determine the co nfiden ce limits for the abscissa of th e intersection of two linear regressions has been developed.This method does not require the ass umption of equal varian ce for the two regressions, as was necessa ry with previous methods.A num eri cal example is in c luded on thermodynamic, glass transition data for whic h this method is applicable.Compari sons are made between the results using equal and unequal variance ass umptions.A FORTRAN subroutine is included for computations using both assumptions.