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> That should be "lag operators" not "log operators" of course.  Though
> a log could be handy for related problems...
> 
> On 10/25/07, Austin Nichols <austinnichols@gmail.com> wrote:
> > Damiano Rossi <west--@libero.it>:
> > Not sure which previous post you refer to, and "doesn't help" doesn't
> > help clarify the confusion, but you can certainly get what you need
> > from -by- and log operators (see -help tsvarlist-) e.g.
> >
> > webuse grunfeld, clear
> > g k0=int(uniform()*1000) if year==1935
> > g k=.
> > bys c (y): replace k=cond(l.k<.,l.k*(1-`d'),k0)+i
> > li com year k0 k inv in 1/10, noo sepby(com)
> >
> > On 10/25/07, west--@libero.it <west--@libero.it> wrote:
> > > Dear all,
> > >
> > > I need some help to compute a capital stock series from a gross investment series. My primary problem is that I have to estimate the initial capital stock (K_0 ) for each firm. As a general rule, it is used the book value of fixed capital (K) in the first year of data (e.g. 1996) for each firm. How can I command Stata to consider this first observation (firm by firm) and then compute a capital stock series, using a perpetual inventory and a constant rate of depreciation? A previous post doesn't help me much on this point. These are the data.
> > >
> > > Panl oif 300 firms, 10 years (1996-2006)
> > > k = capital stock
> > > I = capital investment
> > > d [delta] = 0.05
> > >
> > > The evolution of the real capital stock is:
> > > K_t+i = (1 - d)*K_t+i-1 + I_t+i
> >
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