v1: 2 missing values generated . list +---+ | v1 v2 | |---| 1. | 7 -99 | 2. | . 10 | 3. | 8 -99 | 4. | . 10 | +---+ . mvdecode _all, mv(-9 -99) //全部定义为缺失值 v1: 2 missing values generated v2: 2 missing values generated . list +---+ | v1 ...
就是有的变量的数据是缺失的，比如有个变量var1数据都是1和0，你生成一个变量，当var1=1的时候，var2等于5，因为var1中有的变量为0，这部分为0的观测值在var2里就是缺失值了
gen d_open = open[_n] - open[_n-1] //生成相邻两天开盘价的差值 (1 missing value generated) list ?_open in 1/10 +---+ | D_open d_open | |---| 1. | 1.47998 . | 2. | 4.330078 -37.01001 | 3. | 4.660034 64.29004 | 4. | .8099365 -14.22009 | 5. | 2.48999 -34.98999 |...
.generate e12=ehat1*ehat1 (1 missing value generated) .twoway (connected e12 n) ARIMA(0,1,1)(noconstant)的残差平方图 Ps.tsline e12也可以得到残差平方图 (同均值的残差序列的方差就是残差平方的期望,)残差平方图上的异方差性太过明显了。 3考察序列的差分平稳属性,并考察过差分特征 ...
•Stata软件生成三类变量：numeric（数值型）变量，string（字符型）变量（相当于定性变量）和date（日期）变量。虽然日期变量以数值型变量的技术记录、存储，但二者的用途却不同 •数值型变量包括定距和定比变量。可以是整数、小数、负数和正数。数值型变量可以有多种存储方式（StorageTypes）•用str类型保存的定性...
(1 missing value generated) gen lx=L.x (1 missing value generated) reg D.y ly lx D.ly D.lx Source | SS df MS Number of obs = 202 ---+--- F( 4, 197) = 21.07 Model | 37251.2525 4 9312.81313 Prob > F = 0.0000 Residual | 87073.3154 197 441.996525 R-squared = 0.2996 -...
gen a = age_n-1 (1 missing value generated) . gen b = age_n+1 (1 missing value generated) . list +-+ | province personid homesize age girl siblings order a b | |-| 1. | 21 2106018504 50 5 girl 1 1 . . 2 | 2. | 32 3209163903 25 2 b 19、oy 0 1 5 8 | 3. |...
5、hsy1mydata基于文件夹dir 显示文件夹variables)save bs 保存数据,名为 bs 直接运行是双击,显示在框内为单击 g(enerate) currrate=Totcurass/Tutcurlia流动比率 ( 等号后面点右上方显示 (8 missing values generated) 有八个缺失值g lev=Totlia/Totass 负债率 leverageg pright= Totlia/ TotSHE 产权比率...
显示(8 missing values generated)有八个缺失值 g lev=Totlia/Totass负债率leverage g pright= Totlia/ TotSHE产权比率porperty save bs2另存数据 drop为删除变量 clear从内存删掉,不会从硬盘删掉 ---利润表--- import save is g incorate= Netprf/ Incmope利润率=净利润/营业利润 save is2 --- clear ...
gen a = age[_n-1] (1 missing value generated) . gen b = age[_n+1] (1 missing value generated) . list +---+ | province personid homesize age girl siblings order a b | |---| 1. | 21 2106018504 50 5 girl 1 1 .