  The measurements of expansion rate $H(z)$ and the growth rate $f\sigma_8(z)$
describe the evolution of the universe, and both of them can constrain the
cosmological models through data analysis. Due to the lack of data points,
these datasets are combined by the traditional combined method ($\chi^2$
method) to select a best-fitting cosmological model. In 2017, Linder proposed a
joint method, which describes the evolution of the universe through
$H(z)-f\sigma_8$ diagram instead of the redshift z. Compared to individual
datasets, Linder demonstrated the advantages of the joint method to distinguish
cosmologies. In this paper, we compare the significance between the traditional
combined method and Linder's joint method by constraining the density parameter
$\Omega_M$ using Akaike Information Criterion (AIC) and Bayesian Information
Criterion (BIC). The result shows that the joint method is more significant
than the traditional combined method.
