  We explore recent estimations of the Hubble parameter $H$ depending on
redshift $z$, which include 31 $H(z)$ data points measured from differential
ages of galaxies and 26 data points, obtained with other methods. We describe
these data together with Union 2.1 observations of Type Ia supernovae and
observed parameters of baryon acoustic oscillations with 2 cosmological models:
the standard cold dark matter model with the $\Lambda$ term ($\Lambda$CDM) and
the model with generalized Chaplygin gas (GCG). For these models with different
sets of $H(z)$ data we calculate two-parameter and one-parameter distributions
of $\chi^2$ functions for all observed effects, estimate optimal values of
model parameters and their $1\sigma$ errors. For both considered models the
results appeared to be strongly depending on a choice of Hubble parameter data
sets if we use all 57 $H(z)$ data points or only 31 data points from
differential ages. This strong dependence can be explained in connection with 4
$H(z)$ data points with high redshifts $z>2$.
