At what value of m does the cross-validation method begin, Basic Statistics

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At what value of m does the cross-validation method begin

Reduce the size of the sunspots data from Problem 2 by taking only the first m observations:

At what value of m does the cross-validation method begin to provide a reasonable estimate? Why is this occurring?

Problem 2

Consider the data set sunspots from Andrews and Herzberg (1985) as a response variable. For the predictor data x, use

Apply Friedman's smoother using trial and error to find a span that seems to work well with the data. Then find an estimate using the span determined by cross-validation. Describe the results (taking into account Comment 5).

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Basic Statistics: At what value of m does the cross-validation method begin

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