Data smoothing method, and program for performing the method

A data smoothing method for smoothing numerical data acquired at a plurality of data acquisition points or data based on the numerical data, by using numerical data at data acquisition points present in a smoothing width including a data acquisition point at which respective numerical data is acquired or data based on the numerical data, the method comprising:

• a standard error calculation step of calculating a standard error of numerical data at each data acquisition point or data based on the numerical data;
• a smoothing width determination step, performed after the standard error calculation step, of determining the smoothing width for each of the data acquisition points based on the standard error of the numerical data at each of the data acquisition points or the data based on the numerical data, in such a way that the smoothing width becomes narrower for a data acquisition point for which the standard error of the numerical data or the data based on the numerical error is greater;
• and
• a smoothing step of performing a smoothing process on the numerical data at each of the data acquisition points or the data based on the numerical data, by using the numerical data at the data acquisition points present in the smoothing width determined in the smoothing width determination step or the data based on the numerical data.