This method is used for resampling with use of Cubic Spline Interpolation. This is a method to estimate data using more complex function than usual polynomial function and rational function. Since Cubic Spline Function estimates data while considering the possibility of differentiation, it can result in more reliable estimated value than other interpolation methods. Further, it is the most appropriate method to make use of characteristics of time series signals generated in the nature. Such Cubic Spline Interpolation uses the following formula.
Select data you want to apply this method in Analysis Window and click the icon of By Cubic Spline Interpolation. This will display a dialogue box for sampling setting as shown in the below. Input sampling values as you want and click Apply button. Then, you can get data resampled from sampling values you set. Since interval available to resampling is presented in this dialogue box, you can conduct resampling within this interval.