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拟合和回归有什么区别
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| 如题，拟合和回归有什么区别与联系？请赐教！ |
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Curve fitting is the process of constructing a curve, or mathematical function, that has the best fit to a series of data points, possibly subject to constraints. Curve fitting can involve either interpolation, where an exact fit to the data is required, or smoothing, in which a "smooth" function is constructed that approximately fits the data. A related topic is regression analysis, which focuses more on questions of statistical inference such as how much uncertainty is present in a curve that is fit to data observed with random errors. Fitted curves can be used as an aid for data visualization, to infer values of a function where no data are available, and to summarize the relationships among two or more variables. Extrapolation refers to the use of a fitted curve beyond the range of the observed data, and is subject to a greater degree of uncertainty since it may reflect the method used to construct the curve as much as it reflects the observed data. cite:http://blog.sina.com.cn/s/blog_53b8f53e0102e1pw.html ，我觉得这个说的很明确 |
9楼2012-12-28 10:43:52
2楼2012-03-07 23:37:23
3楼2012-03-07 23:58:55
4楼2012-03-08 00:42:07
