help cstable
-------------------------------------------------------------------------------

Tools for Epidemiology

 cstable.ado, for Stata version 8.0 or higher
 Sept 2007

 
    Univariate cohort analysis for each exposure, results are summarized into
    one table. One row, one exposure.
 
    Result file contains: ordering number of exposure(id), name of variable
    (exposure), total number of exposed, number of exposed cases, attack rate
    of exposed, total number of unexposed, number of unexposed cases, attack
    rate of unexposed, risk ratio, 95%CI interval, 95% p-value.


 Collaborative work by Gilles Desve and Peter Makary.
 Special thanks to Alain Moren. 
 In case of any question please contact us: 
 g.desve@epiconcept.fr
 peter.makary@ktl.fi 
 (Opinions, notices are welcome as well!)



Summary table for cohort study


Syntax

        cstable [varlist] [if] [in] [, options]

    options               Description
    -------------------------------------------------------------------------
    Main
      exact               Calculate 2-sided Fisher's exact p-value (default
                            is chi square test p-value)
      nosort              Results are displayed in the same order of
                            variables in the command line
      rr                  Sort result by risk ratio
      ar                  Sort result by attack rate
      pvalue              Sort result by p-values (default)
      replace             Replace the current dataset with the cstable result
      noabbreviate        Display full exposure name (default fisrt 12 chars)
    -------------------------------------------------------------------------
    by may not be used with cstable.


Description

    cstable Calculate number of cases, attack rate among exposed and
    unexposed, relative risk, 95%CI interval, 95% p-value for each variable
    of varlist.  The result table could be sorted by p-value, risk ratio,
    attack rates.

    Result could be copied with "copy table" in order to be pasted in Excel.
    Alternatively, the replace option store results as a new dataset.  Then,
    results can be exported or saved as a new dataset.

Options

        +------+
    ----+ Main +-------------------------------------------------------------

    exact requests Fisher's exact p be calculated rather than the chi-squared
        and its significance level. Specifying exact is recommended whenever
        samples are small. A conservative rule of thumb for 2x2 tables is to
        specify exact when the least-frequent cell contains fewer than 1,000
        cases.  When the least-frequent cell contains 1,000 cases or more,
        there will be no appreciable difference between the exact
        significance level and the significance level based on the
        chi-squared, but the exact significance level will take considerably
        longer to calculate.  Note that exact does not affect whether exact
        confidence intervals are calculated.


    nosort Specifies that the order of the exposures will be the same in the
        result table as it was in the command.

    rr Results will be sorted by risk ratio in descending order.

    ar Results will be sorted by attack rate in descending order.

    pvalue Results will be sorted by p-value in ascending order. If no other
        sorting option is used, results will be sorted by ascending p-value
        as default.

    replace Specifies that the result table will replace the original dataset
        in the memory and it will appear in the browser window. It means that
        the original dataset will be deleted from the memory.  preserve then
        restore may be used to get back the original dataset, or upload it
        again with the use command.  replace is used to create dataset from
        the result table (e.g. to save it), or to solve "copy table"
        incompatibilities in certain cases.

    noabbreviate Displays full exposure name (default 12 first chars).


Remarks
    As with the cs command, variables used with cstable must be coded as 0/1.
    Sorting results only available in version 9
    For detailed information contact g.desve@epiconcept.fr or
    peter.makary@ktl.fi

Examples

    . cstable ill mousse tiramisu beer sex agegrp

    . cstable ill mousse tiramisu beer, rr
    The result table is sorted by decreasing risk ratio


Also see
cctable, csinter, cs.

    Manual:

    Online: