Non-parametric reconstruction of the cosmological \textit{jerk}
  parameter
  The cosmological jerk parameter $j$ is reconstructed in a non-parametric way
from observational data independent of a fiducial cosmological model. From this
kinematical quantity, the equation of state parameter for composite matter
distribution is also found out. The result shows that there is a deviation from
the $\Lambda$CDM model close to $z=1.5$, at the $3\sigma$ confidence level.
