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

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

Subject |
st: RE: Outputs as inputs - how to efficiently process a series of routines? |

Date |
Tue, 31 Aug 2010 10:05:18 +0100 |

-statsby- is your friend. See the manual entry in [D] and also SJ-10-1 gr0045 . . . . . . . . . . . . . Speaking Stata: The statsby strategy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N. J. Cox Q1/10 SJ 10(1):143--151 (no commands) demonstrates the use of statsby to prepare a reduced dataset for subsequent graphing Nick n.j.cox@durham.ac.uk Philip Burgess This is a data management question rather than a statistical issue.... I have a dataset which is stratified by 4 variables: 1. Sample - kids, adults, or older persons; 2. Year - 2006, 2007, 2008 or 2009; 3. Treatment setting - inpatient, residential or ambulatory; 4. Status - baseline, follow-up or change. Thus, the overall structure is a 3 x 4 x 3 x 3 = 108 unique strata. The outcome variable is usually a summary score and I need to estimate various statistics (say mean, SD, percentiles) for each of the strata; and I also need to estimate the internal consistency of the outcome measure with Cronbach's Alpha. I need to use the estimated statistic(s) as 'input' in a variety of other calculations (e.g., calculate overall Effect Size using the mean, the SD; other calculations require Alpha). I know these statistics are available immediately after execution - I can get these using the command - return list - . After that, I can generate a new variable - gen double alpha = r(alpha)- and then run - collapse (first) alpha - to get the required statistic(s). The problem is that I have 108 strata and whereas I can 'manually' code each of these variants (and save as temp files, then - append - all 108 to save a single file - this is both inefficient and the risk of error (i.e., me!) is high. Is there a way around this? I should add that I have mainly used SPSS for these kinds of data management issues. Theoretically, using SPSS commands that 'split' the data file by the required partitions and then using its Output Management System will achieve the required output. This used to work with earlier versions but not the current release - hence my efforts with 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/

**Follow-Ups**:**Re: st: RE: Outputs as inputs - how to efficiently process a series of routines?***From:*Philip Burgess <philip.burgess.uq@gmail.com>

**References**:**st: Outputs as inputs – how to efficiently process a series of routines?***From:*Philip Burgess <philip.burgess.uq@gmail.com>

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