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The Global Economic Impact of Private Equity Report 2008 - World ...

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tablesTable 3: Count models <strong>of</strong> citation intensity(1) (2) (3) (4) (5) (6) (7)Absolute Relative Absolute Relative Absolute Relative RelativeIntensity Intensity Intensity Intensity Intensity Intensity IntensityNegative Negative Negative Negative NegativePoisson Poisson Binomial Binomial Binomial Binomial BinomialModel Model Model Model Model Model ModelEvent Year -3 1.089** 1.012 1.089 1.035(0.041) (0.038) (0.085) (0.077)Event Year -2 1.107*** 1.037 1.107 1.060(0.043) (0.040) (0.090) (0.082)Event Year -1 1.029 1.021 1.029 1.024(0.041) (0.041) (0.085) (0.081)Event Year 1 1.042 1.064 1.042 1.092(0.048) (0.049) (0.099) (0.099)Event Year 2 1.300*** 1.401*** 1.300** 1.375***(0.062) (0.067) (0.135) (0.135)Event Year 3 1.786*** 1.942*** 1.786*** 1.919***(0.088) (0.095) (0.210) (0.213)Event Year 4 1.574*** 1.750*** 1.574*** 1.714***(0.093) (0.104) (0.219) (0.225)Event Year 5 1.473*** 1.805*** 1.473** 1.787***(0.120) (0.147) (0.281) (0.323)Post LBO Dummy 1.251*** 1.381***(0.064) (0.067)Public-to-<strong>Private</strong> 1.067<strong>Private</strong>-to-<strong>Private</strong> 1.182***Divisional 0.965Secondary 1.232**Post x Pub-to-Pri 0.986Post x Pri-to-Pri 0.863Post x Divisional 0.925Post x Secondary 4.463***Observations 4,207 4,205 4,207 4,205 4,207 4,205 4,175Standard errors in parentheses* significant at 10%; ** significant at 5%; *** significant at 1%(0.058)(0.076)(0.031)(0.106)(0.095)(0.086)(0.073)(0.635)NOTE: <strong>The</strong> sample consists <strong>of</strong> 6,398 patents awarded up to May 2007 to 495 firms that received private equity backing between 1980 and 2005. Firmsand patents are only included in the sample if patents were applied for between three years before and five years after the private equity investment. <strong>The</strong>unit <strong>of</strong> observation is each patent in the sample with at least three years to be cited. <strong>The</strong> dependent variable is the number <strong>of</strong> citations received in the threeyears after the award. <strong>The</strong> table reports incidence rate ratios.38 Large-sample studies: Long-run investment<strong>The</strong> <strong>Global</strong> <strong>Economic</strong> <strong>Impact</strong> <strong>of</strong> <strong>Private</strong> <strong>Equity</strong> <strong>Report</strong> <strong>2008</strong>

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