stata中中括号代表什么意思

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如table rural health marriage[fw=cid1],c(mean wage) format(%9.2f) center中，rural、health、marriage、cid1等均为变量名，其中[fw=cid1]代表什么意思，一般语句中的中括号也可以这么解释吗？

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关键词：Stata tata Marriage Health format

同问！

[fw=cid1]是指当fw=cid1时值为1，否则值为0

木纸木纸 发表于 2023-7-21 15:12
[fw=cid1]是指当fw=cid1时值为1，否则值为0

好好看帮助在回答，那个是权重



Title


    [U] 11.1.6 weight -- Weights




Remarks


    Most Stata commands can deal with weighted data.  Stata allows four kinds of weights:


    1.  fweights, or frequency weights, are weights that indicate the number of duplicated
        observations.


    2.  pweights, or sampling weights, are weights that denote the inverse of the probability that
        the observation is included because of the sampling design.


    3.  aweights, or analytic weights, are weights that are inversely proportional to the variance
        of an observation; that is, the variance of the jth observation is assumed to be
        sigma^2/w_j, where w_j are the weights.  Typically, the observations represent averages
        and the weights are the number of elements that gave rise to the average.  For most Stata
        commands, the recorded scale of aweights is irrelevant; Stata internally rescales them to
        sum to N, the number of observations in your data, when it uses them.


    4.  iweights, or importance weights, are weights that indicate the "importance" of the
        observation in some vague sense.  iweights have no formal statistical definition; any
        command that supports iweights will define exactly how they are treated.  Usually, they
        are intended for use by programmers who want to produce a certain computation.


    The general syntax is


            command ... [weightword=exp] ...


    For example:


        . anova y x1 x2 x1*x2 [fweight=pop]


        . regress avgy avgx1 avgx2 [aweight=cellpop]


        . regress y x1 x2 x3 [pweight=1/prob]


        . scatter y x [aweight=y2], mfcolor(none)


    You type the square brackets.


    Stata allows abbreviations: fw for fweight, aw for aweight, and so on.  You could type


        . anova y x1 x2 x1*x2 [fw=pop]


        . regress avgy avgx1 avgx2 [aw=cellpop]


        . regress y x1 x2 x3 [pw=1/prob]


        . scatter y x [aw=y2], mfcolor(none)


    Also, each command has its own idea of the "natural" kind of weight.  If you type


        . regress avgy avgx1 avgx2 [w=cellpop]


    the command will tell you what kind of weight it is assuming and perform the request as if you
    specified that kind of weight.


    There are synonyms for some of the weight types.  fweight can also be referred to as frequency
    (abbreviation freq).  aweight can be referred to as cellsize (abbreviation cell):


        . anova y x1 x2 x1*x2 [freq=pop]


        . regress avgy avgx1 avgx2 [cell=cellpop]