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help for ^istdize^                                                 (STB-42: sg80)
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Indirect standardization
------------------------

   ^istdize^ casevar_s popvar_s stratavars using ^filename^ [^if^ exp] [^in^ range]^,^
           {^pop^vars^(^casevar_p popvar_p^)^ | ^rate(^ratevar_p # | crudevar_p^)^}
              [ ^by(^groupvars^)^ ^pr^int ^f^ormat^(%^fmt^)^ ^l^evel^(^#^)^ ]


Description
-----------

^istdize^ produces indirectly standardized rates using a standard population.
This standardization methods is indicated in situations where the
stratum-specific rates for the population being studied are either unavailable
or are based on small samples and thus unreliable.  The standardization uses
the stratum-specific rates of a standard population to calculate the expected
number of cases in the study population(s), sums them, and then compares them
to the actual number of cases observed.  The standard population's information
is contained in another Stata data file and specified via ^using^ on the
command line.

casevar_s is the variable name for the study population's number of cases
(deaths). It must contain integers and in each subpopulation identified by
groupvar it must have constant values or missing.

popvar_s identifies the number of subjects represented by each observation in
the study population.

stratavars define the strata. 

Options
-------

^popvars(^casevar_p popvar_p^)^ or ^rate(^ratevar_p #|crudevar_p^)^ must be
specified.  Only one of these two options is allowed.  These options are used
to describe the standard population's data where:

         ^rate(^ratevar_p #|crudevar_p^)^:  ratevar_p contains the strata
         specific rates. #|crudevar_p is used to specify the crude case rate
         either via a variable name or optionally by the crude case rate
         value.  If the crude rate variable is used it must be the same for
         all observations or missing in all but one.

         ^popvars(^casevar_p popvar_p^)^:  casevar_p records the number of
         cases (deaths) for each stratum in the standard population.  popvar_p
         records the total number of individuals in each stratum (individuals
         at risk).

^by(^groupvars^)^ it specifies variables identifying study populations when
more than one exist in the data.

^print^ outputs a tabulate summary of the standard population before
displaying the study populations.

^format(%^fmt^)^ specifies the format to use for displaying the summary table.
The default is ^%10.0g^; see help @%fmt@.

^level(^#^)^ specifies the confidence level, in percent, for the confidence
interval of the adjusted rate; see help @level@.


Example
-------

  . ^istdize deaths pop age race sex using USstd.dta, by(year)^
    ^rate(USrate crude)^
  . ^istdize deaths pop age race sex using USstd, by(year) rate(USrate 0.0095)^


Author
------

      Mario Cleves
      Stata Corporation
      email: mcleves@@stata.com


Also see
--------

    STB:  STB-42 sg80
 Manual:  [R] dstdize
On-line:  help for @epitab@, @dstdize@