On Tue, 1 Jan 2008, Charles C. Berry wrote:
On Tue, 1 Jan 2008, zhijie zhang wrote:
Dear all,
I have two variables, y and x. It seems that the relationship between them
is Piecewise Linear Functions. The cutpoint is 20. That is, when x20, there
is a linear relationship between y and x;
On Thu, 3 Jan 2008, zhijie zhang wrote:
Some developments with confusions. I tried the spline method and dummy
variable approach to do it. But their results are very different. See
following.
[volumes of output and gratuitous SAS code deleted]
Q1: Why are these two methods so different
*example*( pmin ) is useful. I will use it from now on.
Thanks a lot.
On Jan 3, 2008 2:50 AM, Charles C. Berry [EMAIL PROTECTED] wrote:
On Thu, 3 Jan 2008, zhijie zhang wrote:
Some developments with confusions. I tried the spline method and dummy
variable approach to do it. But their
Dear all,
I have two variables, y and x. It seems that the relationship between them
is Piecewise Linear Functions. The cutpoint is 20. That is, when x20, there
is a linear relationship between y and x; while x=20, there is another
different linear relationship between them.
How can i specify
On Tue, 1 Jan 2008, zhijie zhang wrote:
Dear all,
I have two variables, y and x. It seems that the relationship between them
is Piecewise Linear Functions. The cutpoint is 20. That is, when x20, there
is a linear relationship between y and x; while x=20, there is another
different linear
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