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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 > > > * > * 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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