  An analysis leveraging 170 optical spectra of 35 stripped-envelope (SE)
core-collapse supernovae observed by the Carnegie Supernova Project-I and
published in a companion paper is presented. Mean template spectra are
constructed for the SNe IIb, Ib and Ic sub-types and parent ions associated
with designated spectral features are identified with the aid of the spectral
synthesis code SYNAPPS. Our modeled mean spectra suggest the ~6150~\AA\ feature
in SNe~IIb may have an underlying contribution due to silicon, while the same
feature in some SNe Ib may have an underlying contribution due to hydrogen.
Standard spectral line diagnostics consisting of pseudo-equivalent widths (pEW)
and blue-shifted Doppler velocity are measured for each of the spectral
features. Correlation matrices and rolling mean values of both spectral
diagnostics are constructed. A Principle Component Analysis (PCA) is applied to
various wavelength ranges of the entire data set and suggests clear separation
among the different SE SN sub-types, which follows from trends previously
identified in the literature. In addition, our finds reveal the presence of two
SNe IIb sub-types, a handful of SNe Ib displaying signatures of weak,
high-velocity hydrogen, and a single SN~Ic with evidence of weak helium
features. Our PCA results can be leveraged to obtain robust sub-typing of SE SN
based on a single spectrum taken during the so-called photospheric phase,
separating SNe IIb from SNe Ib with ~80 percent completion.
