Interpolation and extrapolation in statistics pdf
File Name: interpolation and extrapolation in statistics .zip
Interpolation is the process of deriving a simple function from a set of discrete data points so that the function passes through all the given data points i. It is necessary because in science and engineering we often need to deal with discrete experimental data. Interpolation is also used to simplify complicated functions by sampling data points and interpolating them using a simpler function.
Extrapolation is a useful statistical tool used to estimate values that go beyond a set of given data or observations. In this lesson, you will learn how to estimate or predict values using this tool. It could even be said that it helps predict the future! To help us remember what it means, we should think of the part of the word 'extra' as meaning 'more' data than what we originally had. This tool is not only useful in statistics but also useful in science, business, and anytime there is a need to predict values in the future beyond the range we have measured. Let's try a basic extrapolation by finding values in a numerical sequence. When using extrapolation, we look for the relationship between the given values.
Interpolation and Extrapolation
In the mathematical field of numerical analysis , interpolation is a type of estimation , a method of constructing new data points within the range of a discrete set of known data points. In engineering and science , one often has a number of data points, obtained by sampling or experimentation , which represent the values of a function for a limited number of values of the independent variable. It is often required to interpolate , i. A closely related problem is the approximation of a complicated function by a simple function. Suppose the formula for some given function is known, but too complicated to evaluate efficiently. A few data points from the original function can be interpolated to produce a simpler function which is still fairly close to the original. The resulting gain in simplicity may outweigh the loss from interpolation error.
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In this page you can download an Excel Add-in useful to linear, quadratic and cubical interpolation and extrapolation. The functions of this Add-in are very simple to use and they have context help, through a chm file. If you have an old release of Interpolation.
Extrapolation and interpolation are both used to estimate hypothetical values for a variable based on other observations. There are a variety of interpolation and extrapolation methods based on the overall trend that is observed in the data. These two methods have names that are very similar. We will examine the differences between them.