  Accurate stellar parameters and precise elemental abundances are vital pieces
to correctly characterize discovered planetary systems, better understand
planet formation, and trace galactic chemical evolution. We have performed a
uniform spectroscopic analysis for 1127 stars, yielding accurate gravity,
temperature, and projected rotational velocity in addition to precise
abundances for 15 elements (C, N, O, Na, Mg, Al, Si, Ca, Ti, V, Cr, Mn, Fe, Ni,
and Y). Most of the stars in this sample are Kepler Objects of Interest,
observed by the California-Kepler Survey (CKS) and include 1,003 stars hosting
1,562 confirmed planets. This catalog extends the uniform analysis of our
previous catalog, bringing the total of homogeneously analyzed stars to almost
2,700 F, G, and K dwarfs. To ensure consistency between the catalogs, we
performed an analysis of our ability to recover parameters as a function of S/N
ratio and present individual uncertainties as well as functions to calculate
uncertainties for parameters derived from lower S/N ratio spectra. With the
updated parameters, we used isochrone fitting to derived new radii, masses and
ages for the stars. Finally, we look at the Mg/Si ratios of super-Earth and
sub-Neptune hosts to test whether differences in initial composition might lead
to differences in planet radius. We find no differences in the Mg/Si
distribution as a function of planet radius.
