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From |
"Yi, Bingsheng" <byi@coba.usf.edu> |

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

Subject |
st: how to generate groups based on some characteristics,obtain the mean/median value for each group, and assign a sample into the correct group |

Date |
Thu, 20 Jun 2002 11:48:33 -0400 |

Special thanks to P. Seed!!! Thank you so much!!! I'm sorry that I didin't make my problem clearer. Supposes the 10 firms (obs 1-10)have the same ind4 as 1041, I will consider them to belong to industry 1041. But as to firm 11, there is only one firm in its 4-digit ind code 1044, I will consider it belong to industry 104, which will contain all the 11 firms with the same ind3, 104. In other words, firm 1-10 belong to industry 1041 and industry 104 simultaneously. obs Tobin's q ind4 ind3 ind2 ind1 industry size grp-under-ind4 grp-under-ind4 mean-of-grp 1 1041 104 10 1 1041 1 small ? 2 1041 104 10 1 1041 3 small ? 3 1041 104 10 1 1041 2 small ? 4 1041 104 10 1 1041 5 middle ? 5 1041 104 10 1 1041 4 middle ? 6 1041 104 10 1 1041 9 large ? 7 1041 104 10 1 1041 8 middle ? 8 1041 104 10 1 1041 11 large ? 9 1041 104 10 1 1041 10 large ? 10 1041 104 10 1 1041 7 middle ? 11 1044 104 10 1 104 6 N.A. ? Subsequently I will subdivide firms in each industry into small, middel and large groups according to firm size. The small group contains the smallest 30% firms in size within an industry, the middle group contains the middle 40% firms in size (30% to 70%), and the large group contain firms whose size belongs to the largest 30% in that industry. How I can subdivide firms according to size in an industry and assign a firm to a group according to its size? I also need to get the median or mean value of Tobin's q for each of these groups within an industry. For industry 1041, there are 10 firms, firm 1 through 10, and For indutry 104, there are 11 firms. Take firm 1 as an example, according to its size, it belongs to samll group under ind4 as 1041. Firm 1's industry-size adjusted Tobin's q = firm 1's Tobin'q - the mean Tobin's q of small group under ind4. As to firm 11, first I need to assign firm 11 into a group under ind3 of 104 according to its size (industry 104 contain all the 11 firms, a firm can belong to different groups under different industry codes), then I have to get the mean value of Tobin's q of firms in the same group as firm 11. I hope that you will understand my problems now and help me out, I really apprecaite your great helps!!! Bing * * 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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