Changes in the system loads requires the systems to be adjusted accordingly which would make the entire system to be dynamic. As the system undergoes continuous changes, the operator needs to be in extreme alert to make real time decisions. Newton-Raphson power flow method that makes use of the bus admittance matrix remains as an efficient and most popular method to get the power low solution. Elements of Jacobian matrix are computed from standard expressions which lack physical significance. In this paper, the preliminary analysis on state vector and computational time are discussed in term of dynamic input changes and stress condition. The conventional Weighted Least Square (WLS) method and modified Jacobian WLS (M-JWLS) has been tested on 4 different bus systems which are IEEE 14-bus system, IEEE 30-bus system, IEEE 57-bus system and IEEE 118-bus system. This research is expected to provide a data validation indicator for the research continuation. © 2022 Institute of Advanced Engineering and Science (IAES).