Non-transitory computer-readable recording medium, calculation method and information processing device

A non-transitory computer-readable recording medium that stores a program causing a computer to execute a process, the process including:

• an acquisition process of changing a parameter for identifying a baseline to multiple values to obtain multiple estimated baselines estimated for each of the multiple values, an identification process of identifying peaks in multiple graphs that represent differences between a base data of spectral data and each of the multiple estimated baselines, and a selection process of selecting a first graph from the multiple graphs according to a number of peaks and a peak area of each of the multiple graphs, when identifying the baseline using a nonlinear least squares method for the base data.