  The number of sudden spin-ups in radio pulsars known as pulsar glitches has
increased over the years. Though a consensus has not been reached with regards
to the actual cause of the phenomenon, the electromagnetic braking torque on
the crust quantified via the magnitude of pulsar spin frequency first
derivative, $ \dot{\nu} $ is a key factor in mechanisms put across toward the
understanding of the underlying principles involved. The glitch size has been
used to establish a quantity used to constrain the mean possible change in
pulsar spin frequency $ (\nu) $ per year due to a glitch known as the `glitch
activity'. Traditionally, the glitch activity parameter $ A_{g} $ is calculated
from the cumulative glitch sizes in a pulsar at a certain observational time
span. In this analysis, we test the possibility of of quantifying the $ A_{g} $
with the pulsars main spin frequency derivatives (i.e. $ \dot{\nu} $ and
$\ddot{\nu} $). In this approach, the ratio of the frequency derivatives, i.e.
$ |\ddot{\nu}|/\dot{\nu}^{2} $ is seen to constrains the glitch activity in
radio pulsars. The glitch size is found to be independent of the magnitude of
the ratio, however, based on the recorded glitch events, the lower end of $
|\ddot{\nu}|/\dot{\nu}^{2} $ distribution appear to have more glitches. The
minimum inter-glitch time interval in the ensemble of pulsars scale with the
ratio as $t_{g} \sim 3.35(|\ddot{\nu}|/\dot{\nu}^{2})^{0.23} $. The $ A_{g} $
quantified in this analysis supports the idea of neutron star inner-crust
superfluid being the reservoir of momentum transferred during glitches. It
suggests that the moment of inertia of the inner-crust to be at most 10 % of
the entire neutron star moment of inertia.
