cubic spline regression and plot

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ektor
ektor 2019-1-28
回答： Image Analyst 2019-1-28
Dear all,
I have two variables X and Y.
X and Y are both vectors of dimension 8561X1
For example:
X=[ 1
1
1
1
1
5
1];
Y=[ 34200
34201
34202
34203
34204
34205
34210]
I want to regress X on Y using a cubic spline specification and then take the ratio X/, where , is the fitted values obtained from the cubic spline regression
And I want to place the knots at specific positions, eg, 2nd and 5th position.
I found the rcspline package and I did something like
[bhat f sse knots]=rcspline(X,y,knots);
but I am not sure how to address the knots's position.
Any help is greatly appreciated.
Thanks,

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采纳的回答

Image Analyst
Image Analyst 2019-1-28
I don't know about the ratio stuff but you can adapt my cubic spline demo (attached).

更多回答（1 个）

ektor
ektor 2019-1-28
Any help?

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