Thanks.
--- Ben Jann <[email protected]> wrote:
> 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/
>
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