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From |
"Martin Weiss" <martin.weiss1@gmx.de> |

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

Subject |
st: RE: Assistance if possible |

Date |
Wed, 10 Mar 2010 21:54:15 +0100 |

<> Welcome to the Stata community! What is your question, though??? HTH Martin -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Saint Joseph Sent: Mittwoch, 10. März 2010 20:45 To: majordomo@hsphsun2.harvard.edu Cc: statalist@hsphsun2.harvard.edu Subject: st: Assistance if possible Dear Sir/Madam I will like to join the stata group as well as find a way to solve the problem below: I calculate the highest 24-month concentration of merger bids involving firms in that industry in each decade.2 This 24-month period is identified as a potential wave. Taking the total number of bids over the entire decade for a given industry, I simulate 1000 distributions of that number of occurrences of industry member involvement in a bid over a 120-month period by randomly assigning each occurrence to a month where the probability of assignment is 1/120 for each month. I then calculate the highest 24-month concentration of activity from each of the 1000 draws. Finally, I compare the actual concentration of activity from the potential wave to the empirical distribution of 1000 peak 24-month concentrations. If the actual peak concentration exceeds the 95th percentile from that empirical distribution, that period is coded as a wave. For example, 36% of the 161 bids in the health care industry in the 1990s occurred within one 24-month period starting in May of 1996. Out of 1000 simulated distributions of 161 bids across a 10-year period, the 95th percentile of maximum concentration within any 24-month period is 27%. Thus, the cluster of bids in the health care industry starting in May of 1996 is coded as a wave.” * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: Assistance if possible***From:*Saint Joseph <forevertruthful2004@yahoo.com>

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