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From |
"Nick Cox" <n.j.cox@durham.ac.uk> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
RE: st: Count observations per year |

Date |
Tue, 12 Feb 2008 17:22:16 -0000 |

contract firm year, zero is equivalent to these four lines of code. To get Dascha's desired result, you would follow by a -reshape-. Nick n.j.cox@durham.ac.uk Austin Nichols Dascha Orlova <dascha.or@gmx.de>-- Try: g n=1 collapse (count) n, by(firm year) fillin firm year replace n=0 if mi(n) Dascha Orlova > my question is fairy basic but I fail to find a solution myself. I have a sample of projects of N firms from 1990 till now. It looks this: > > year firm inventory > 1990 X1 a > 1990 x2 b > 1990 x3 c > 1990 x3 d > 2000 x2 e > 2000 x3 f > > The problem is: the only thing I am really interested in is the number on the projects per firm per year. So it should look like this: > > firm inv1990 inv2000 > x1 1 0 > x2 1 1 > x3 2 1 > > Is there any count function which I can apply to modify my dataset like this given that the number of firms is quite large? * * 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/

**References**:**st: Count observations per year***From:*"Dascha Orlova" <dascha.or@gmx.de>

**Re: st: Count observations per year***From:*"Austin Nichols" <austinnichols@gmail.com>

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