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

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

Subject |
st: RE: Dividing Panel data into quartiles |

Date |
Thu, 16 Apr 2009 16:58:04 +0100 |

I always wonder why people how want to do something like this, which is, or appears to be, just throwing away information. That said, Ulrich Kohler's -xtile()- in -egenmore- from SSC supports classification in separate groups. Nick n.j.cox@durham.ac.uk JIBONAYAN RAYCHAUDHURI I have a panel data set, with data on a number of firms over a number of years. Each observation is for a particular firm and year, and has various data for that observation. The firms are classified by a two digit industrial classification scheme called NIC2. I would like to divide my data into 4 quartiles or 5 quintiles, on the basis of one of my variables, liquidity. So I would like to create a variable, call it quartile, that has the value 1 if that observation for the firm is in the top quartile of liquidity for that year for that industry, has the value 2 if that observation is in the second quartile of liquidity for that year and industry, etc. (a firm might have different values of "quartile" in different years, depending on which quartile of liquidity it fits into in a particular year. The quartiles will probably contain somewhat different firms in each year.) The complication is that I want the firms divided into quartiles for each year and also each industry. I think the command xtile would probably work here to divide firms into quartiles, but I am not sure as to how the code would have to work to get all firms in a year sorted by industry and then divide them into quartiles, although it seems like it should be simple. * * 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: Dividing Panel data into quartiles***From:*JIBONAYAN RAYCHAUDHURI <jibonayanrc@yahoo.com>

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