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  • IPTW Propensity score analysis - how to calculate standardized difference on multi-level categorical variable?

    Hi all,

    I have conducted a -teffects ipw- analysis on an observational dataset. I am using -tebalance summarize- to obtain standardized differences, which make sense to me (and for which I can replicate the calculations) for both continuous and dichotomous categorical variables.

    However, for multi-level categorical variables, I would like to present a single standardized difference. The -tebalance summarize- output, however, provides a standardized difference for each non-base level of the categorical variable. See below:
    Code:
      -----------------------------------------------------------------
                      |Standardized differences          Variance ratio
                      |        Raw    Weighted           Raw   Weighted
      ----------------+------------------------------------------------
                        |
             LV_grade |
                   2  |  -.1980125    .1603124      .8048659   1.128188
                   3  |   -.165836   -.1739039        .60628   .5127054
                   4  |  -.0760321   -.0712021      .4732641   .3883542
    In the example above, "LV_grade" contains four levels.

    I found the following PDF which seems to address my issue, but I am uncertain how to extend the special case of a two-level categorical variable to a multi-level variable. http://support.sas.com/resources/pap...2/335-2012.pdf

    Is anyone able to help?

    Many thanks, Phil
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