  Planar normal state resistivity data taken from three families of cuprate
superconductors are compared with theoretical calculations from the recent
extremely correlated Fermi liquid theory (ECFL). The two hole doped cuprate
materials $LSCO$ and $BSLCO$ and the electron doped material $LCCO$ have
yielded rich data sets at several densities $\delta$ and temperatures T,
thereby enabling a systematic comparison with theory. The recent ECFL
resistivity calculations for the highly correlated $t$-$t'$-$J$ model by us
give the resistivity for a wide set of model parameters. After using X-ray
diffraction and angle resolved photoemission data to fix parameters appearing
in the theoretical resistivity, only one parameter, the magnitude of the
hopping $t$, remains undetermined. For each data set, the slope of the
experimental resistivity at a single temperature-density point is sufficient to
determine $t$, and hence the resistivity on absolute scale at all remaining
densities and temperatures. This procedure is shown to give a fair account of
the entire data.
