Today, thanks to the great help of the computer, with large computational speed, we can calculate the mean squared error (MSE) of the empirical formula, the turn of each parameter variables change in the different ranges of values and compare them to find the optimal set of parameters (for error is almost the smallest MSE). After predicting empirical formulations we conducted initial miscalculation can use a set of parameters for any possible error MSE is large. Next we give 1 parameter change other parameters are fixed and the calculation error during a multiple-variable parameters of the selected range. We will see the error initially fell but then rose, but kept to the wrong number increased until by 1 part of the initial error or the amplitude increases to the stop. Then give one other parameter changes, other parameters fixed and repeat the same calculation steps. And so the calculation is repeated with each parameter change, until the errors stop falling or negligible reduction is stopped completely, the following steps within the parameters change day crystal ( smaller than.
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