Updated constraints on $f(T)$ models using direct and indirect
  measurements of the Hubble parameter
  We extract observational constraints on $f(T)$ gravity, using the recently
proposed statistical method which is not affected by the value of $H_0$ and
thus it bypasses the problem of the disagreement in its exact numerical value
between Planck and direct measurements. We use direct measurements of the
Hubble parameter with the corresponding covariance matrix, and for completeness
we perform a joint analysis using the latest data from Supernovae type Ia based
on JLA sample, quasi-stellar objects, and Cosmic Microwave Background shift
parameter from Planck. We analyze a large family of $f(T)$ models, and we
compare the fitting results with $\Lambda$CDM cosmology using the AIC
statistical test. Utilizing only the Hubble parameter data we find that in the
case of the power-law $f(T)$ model a small but non-zero deviation from
$\Lambda$CDM cosmology is slightly favored at 1-$\sigma$, nevertheless the
corresponding AIC value shows a statistical equivalence with it. Finally, the
join analysis reveals that all $f(T)$ models are very efficient and in very
good agreement with observations.
