Note that there is also an -ipolate()- Mata function. It
is part of the -moremata- package:
. ssc install moremata
ben
> -----Original Message-----
> From: [email protected] [mailto:owner-
> [email protected]] On Behalf Of Nick Cox
> Sent: Friday, January 20, 2006 1:58 AM
> To: [email protected]
> Subject: st: RE: help on linear interpolation
>
> help ipolate
>
> Nick
> [email protected]
>
> xiao yi
>
> > I need help on a linear interpolation problem. Each
> > firm has a piecewise linear supply schedule specifying
> > the price and quantity they would like to offer. The
> > supply schedule looks like this:
> >
> > Price Quantity
> > p1 q1
> > p2 q2
> > p3 q3
> > p4 q4
> >
> > The (p,q) are aranged in an ascending order. The
> > supply schedule can have as many as 20 (p,q) pairs.
> > For a market equilibrium price a, I need to find the
> > corresponding q(a). Mathematically, the q(a) would be:
> >
> > if a<p1, then q(a)=0
> > if p1<a<p2, then q(a)=q1+{(q2-q1)*(a-p1)/(p2-p1)}
> > similarly,
> > if p2<a<p3, then q(a)=q2+{(q3-q2)*(a-p2)/(p3-p2)}
> > and so on.
> > if a>p4, then q(a)=q4 (suppose p4 is the max(p))
> >
> > Because I have hands of firms and several years of
> > data, I would like to program this. Can anyone on the
> > list give me a hand on the step of linear
> > interpolation? The rest can be done using do-loops.
>
> *
> * For searches and help try:
> * http://www.stata.com/support/faqs/res/findit.html
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
