22、he differenced variance matrix (1) does not equal the number of coefficients being tested (7); be sure this is what you expect, or there may be problems computing the test. Examine the output of your estimators for anything unexpected and possibly consider scaling your variables so that ...
>= greater than or equal to <= less than or equal to == equality (for equality testing) !=does not equal !not ^ power Note: Symbols have to be in the order shown: ">=" not "=>" . /* this is a comment */ * this is also a comment ; /* this is a comment */ * this ...
= does not equal! not^ powerNote: Symbols have to be in the order shown: " >= " not " => " . /* this is a comment */ * this is also a comment ; /* this is a comment */ * this is also a comment // this is a comment as well To continue a command to the next ...
Note: the rank of the differenced variance matrix (1) does not equal the number of coefficients being tested (7); be sure this is what you expect, or there may be problems computing the test. Examine the output of your estimators for anything unexpected and possibly consider scaling your va...
does not contain at least one treated and one control unit. 该算法的工作原理如下: 1. 从协变量X开始并制作一个副本,我们将其表示为X*。 2. 根据用户定义的切点或CEM的自动分箱算法粗化X*。 3. 为X*的每个观测值创建一个层,并将每个观测值放入一个层中。 4. 将这些层分配给原始数据X并删除...
bs(numlist) is the number of bootstrap replications. If bs() is not set, xthreg does not use bootstrap for the threshold-effect test. bootstrap迭代次数 thlevel(#) specifies the confidence level, as a percentage, for confidence interva...
bs(numlist) is the number of bootstrap replications. If bs is not set, xthreg does not use bootstrap for the threshold-effect test. bootstrap迭代次数 thlevel(#) specifies the confidence level, as a percentage, for confidence intervals of the threshold. The default is thlevel(95). 置信区...
(Stata does not allow us to put expressions into things like regression commands; we must create the variables first.) If an obervation had a missing value for exper then, naturally, expersq will also be missing for that observation. In fact, Stata will tell you how many missing ...
stata中summarize所计算出来的峰度skewness和偏度kurtosis有问题,与ECELL和SPSS有较大差异,建议不采用stata的结果。 summarize var1 [aweight = var2], detail (求取分组数据的统计量,var1为各组的赋值,var2为每组的频数) tabstat X1,stats(mean n q max min sd var cv) ...
butinStataoperatorsdonothavemnemonicequivalents.Forexample,youhavetousetheampersand(&)andnottheword"and".Thisworks:var_a>=1&var_b<=10wherethisdoesnot:var_a>=1andvar_b<=10ThesearetheoperatorsthataredifferentinStata:SymbolDefinition&and|or>=greaterthanorequalto<=lessthanorequalto==equality(for...