@文心快码stata option by() required 文心快码 在Stata中,by() 选项不是必需的。 by() 选项在Stata中用于对数据进行分组操作,但它并不是所有命令都必需的。by() 选项通常与某些命令结合使用,以便对数据集的不同子集执行相同的操作。例如,在分组计算平均值、进行回归分析等场景中,by() 选项非常有用。 然而,...
i(varlist) - use varlist as the ID variables i(varlist) is required j(varname [values]) long → wide: varname, existing variable wide → long: varname, new variable takes a variable name or a variable name and a list of values */ 示例1:快速上手 代码语言:javascript 代码运行次数:0...
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SAR与SEM模型估计用到的命令均为spatreg,spatreg语法格式为:spatreg varlist , weights(weights_matrix) eigenval(eigen_matrix) model(lag|error) [ nolog robust level(#) ] 其中,weights(weights_matrix) is always required. It specifies the name of the spatial weights matrix to be used in the estimatio...
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现在尝试pnupt age。这次Stata并未对age变量报错,但提示 'option generate() required'。带参数的选项需要指定参数类型(integer,real,string,name)和默认(不强制)值。generate需要一个name,没有默认值。尝试pnupt age, gen(2)。Stata会抱怨说2不是一个变量名。
4 回归结果及解释 webuse fish, clearsummarizezip count personlivebait, inflate(child camper)The zip command allows us to model the two types of zeros. First, using the required option inflate(), we model whether a visitor fishes as a function of the number of children accompanying him or her...
My main argument is that user-written Stata packages are thesource of learningadvanced Stata programming. In general, any program - whether it is written by Stata staff or a Stata user - intends to solve a problem or facilitate a task. While other users can get benefit from using the progr...
4.moremata library is required since this command use mm quantile func- tion. 5. When there are endogeneous independent variables, endogenous option should be set. For example, if x1 is exogeneous and x2 is endogeneous, the input must be y q x1, endo(x2). ...
My main argument is that user-written Stata packages are thesource of learningadvanced Stata programming. In general, any program - whether it is written by Stata staff or a Stata user - intends to solve a problem or facilitate a task. While other users can get benefit from using the progr...