We have compared the experimental data on charged-particle elliptic flow parameter (n₂) inAu+Au collisions at midrapidity for √sNN = 9.2, 19.6, 62.4, and 200 GeV with results from various models in heavy-ion collisions such as the ultrarelativistic quantum molecular dynamics (UrQMD) model, a multiphase transport model (AMPT), and heavy-ion jet interaction generator (HIJING).We observe that the average n₂ (n₂) from the transport model UrQMD agrees well with the measurements at √sNN = 9.2 GeV but increasingly falls short of the experimental n₂ values as the beam energy increases. The difference in (n₂)  is of the order of 60% at √sNN = 200 GeV. The (n₂) results from HIJING are consistent with zero, while those from AMPT with default settings, a model based
on HIJING with additional initial- and final-state rescattering effects included, give a (n₂) value of about 4% for all the beam energies studied. This is in contrast to an increase in (n₂) with beam energy for the experimental data. A different version of the AMPT model, which includes partonic effects and quark coalescence as a mechanism of hadronization, gives higher values of (n₂) among the models studied and is in agreement with the measured (n₂) values at √sNN = 200 GeV. These studies show that the experimental (n₂) has substantial contribution from
partonic interactions at √sNN = 200 GeV, whose magnitude reduces with decrease in beam energy. We also compare the available data on the transverse momentum and pseudorapidity dependence of n₂ to those from these models.