The data that we usually observe consists of samples from an (often unobservable) population that we usually don’t have all the values for inputs. More often than not, we want to acquire values that are not directly observable or available in the samples. Techniques such as curve fitting and interpolation can help to make educated guesses of the missing values to draw a line, i.e., a function, going through the data points. Values in between given data points can be estimated by evaluating the function at any inputs. See Figure 5-1.
Figure 5-1
Curve fitting and interpolation ...
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