  Moments (Variance ($\sigma^2$), Skewness($S$), Kurtosis($\kappa$)) of
multiplicity distributions of conserved quantities, such as
net-baryon,net-charge and net-strangeness, are predicted to be sensitive to the
correlation length of the system and connected to the thermodynamic
susceptibilities computed in Lattice QCD and Hadron Resonance Gas (HRG) model.
In this paper, we present several measurement artifacts that could lead to
volume fluctuation and auto-correlation effects in the moment analysis of
net-proton multiplicity distributions in heavy-ion collisions using the UrQMD
model. We discuss methods to overcome these artifacts so that the extracted
moments could be used to obtain physical conclusions. In addition we present
methods to properly estimate the statistical errors in moment analysis.
