  In inflation with nonminimal derivative coupling there is not a conformal
transformation to the Einstein frame where calculations are straightforward,
and thus in order to extract inflationary observables one needs to perform a
detailed and lengthy perturbation investigation. In this work we bypass this
problem by performing a Hamilton-Jacobi analysis, namely rewriting the
cosmological equations considering the scalar field to be the time variable. We
apply the method to two specific models, namely the power-law and the
exponential cases, and for each model we calculate various observables such as
the tensor-to-scalar ratio, and the spectral index and its running. We compare
them with 2013 and 2015 Planck data, and we show that they are in a very good
agreement with observations.
