  We present an analysis of the final data release of the Carnegie Supernova
Project I, focusing on the absolute calibration of the luminosity-decline-rate
relation for Type Ia supernovae (SNeIa) using new intrinsic color relations
with respect to the color-stretch parameter, $s_{BV}$, enabling improved dust
extinction corrections. We investigate to what degree the so-called
fast-declining SNeIa can be used to determine accurate extragalactic distances.
We estimate the intrinsic scatter in the luminosity-decline-rate relation, and
find it ranges from $\pm 0.13$ mag to $\pm 0.18$ mag with no obvious dependence
on wavelength. Using the Cepheid variable star data from the SH0ES project
(Riess et al., 2016), the SNIa distance scale is calibrated and the Hubble
constant is estimated using our optical and near-infrared sample, and these
results are compared to those determined exclusively from a near-infrared
sub-sample. The systematic effect of the supernova's host galaxy mass is
investigated as a function of wavelength and is found to decrease toward redder
wavelengths, suggesting this effect may be due to dust properties of the host.
Using estimates of the dust extinction derived from optical and NIR
wavelengths, and applying these to H band, we derive a Hubble constant $H_0 =
73.2 \pm 2.3$ km/s/Mpc, whereas using a simple $B-V$ color-correction applied
to B band yields $H_0 = 72.7 \pm 2.1$ km/s/Mpc. Photometry of two calibrating
SNeIa from the CSP-II sample, SN2012ht and SN2015F, is presented and used to
improve the calibration of the SNIa distance ladder.
