  We study the large solar energetic particle (SEP) events that were detected
by GOES in the $>$ 10 MeV energy channel during December 2006 to March 2014. We
derive and compare solar particle release (SPR) times for the 0.25--10.4 MeV
electrons and 10--100 MeV protons for the 28 SEP events. In the study, the
electron SPR times are derived with the time-shifting analysis (TSA) and the
proton SPR times are derived using both the TSA and the velocity dispersion
analysis (VDA). Electron anisotropies are computed to evaluate the amount of
scattering for the events under study. Our main results include:
1)near-relativistic electrons and high-energy protons are released at the same
time within 8 min for most (16 of 23) SEP events. 2)There exists a good
correlation between electron and proton acceleration, peak intensity and
intensity time profiles. 3) The TSA SPR times for 90.5 MeV and 57.4 MeV protons
have maximum errors of 6 min and 10 min compared to the proton VDA release
times, respectively, while the maximum error for 15.4 MeV protons can reach to
32 min. 4) For 7 low-intensity events of the 23, large delays occurred between
6.5 MeV electrons and 90.5 MeV protons relative to 0.5 MeV electrons. Whether
these delays are due to times needed for the evolving shock to be strengthened
or due to particle transport effects remains unresolved.
