Stata四分之一循环 [英] Stata year-quarter for loop

问题描述

我试图在Stata中创建一个循环。我运行数据< = year&<= quarter的模型。然后预测一年展望。这是模型运行的所有时间点循环，而预测发生在下个季度的样本。所以我的问题是我如何处理，以便当yridx = 2000和qtr = 4时，循环内的下一个季度展望将是year = 2005，year = 1。

  foreach yridx numlist 2000/2012 {
 forvalues qtridx = 1/4 {
 
如果year <= yridx和qtr < = qtridx 
 predict 
} 
} 
  

解决方案

听起来好像在季度日期上工作要容易得多。这是几种方法之一。

  gen qdate = yq（year，qtridx）
 forval m =`= yq（2000,1）'/ `= yq（2012，4）'{
如果qdate< ='m'则退步YX 
预测<无论> 
} 
  

I am trying to create a loop in Stata. I run a model for the data <= year and <= quarter. Then predict one year look ahead. That is the model is run all time points upto the loop, while the prediction happens in the next quarter out of sample. So my question is how do I handle so that when yridx = 2000, and qtr = 4, the next quarter inside the loop look ahead would be year = 2005, and year = 1.

foreach yridx of numlist 2000/2012 {
forvalues qtridx = 1/4 {

regress Y X if year <= yridx and qtr <= qtridx
predict
}
}

解决方案

It sounds as if it would be much easier to work in terms of quarterly dates. Here is one of several ways to do it.

gen qdate = yq(year, qtridx) 
forval m = `=yq(2000,1)'/`=yq(2012, 4)' { 
    regress Y X if qdate <= `m' 
    predict <whatever> 
}

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