Hi, Every time I use g_msd to calculate the MSD for one group, this program always output the diffusion constant like # D[ SOL] = 0.4996 (+/- 0.0366) (1e-5 cm^2/s) I know that g_msd calculates the D using the least square (LSQ) method. But I dont know how to calculate the deviation of D. In this case, how does g_msd get +/- 0.0366? Although I got the exactly same D value using LSQ, I failed to reproduce this deviation value. I know maybe it is very simple, but I have spent considerable time without success. Can anyone explain how to calculate it from the angle of mathematics so that I can easily reproduce the deviation of D? Thanks in advance, Zhongqiao Hu National University of Singapore
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