You can do the reverse unit conversion from Replace year = year(date(dates, "Y")) if year =. Replace datenum = date(dates, "Y") if datenum =. *Replace the missing values for dates that have only year part *Assuming that the first part of the date is the date, second is the month, third is the year. We would then use the replace command with the if condition to fill the missing values using again a matching format. Where the format does not match the code, the newly created variable shall then contain missing values. If you have all these dates in the same column, then you can extract the date or year separately from each format. Gen weekly_date = dofw( dofq(given_date))
Gen quarterly_date = qofd( dofw(given_date)) Gen quarterly_date = qofd( dofm(given_date)) Gen monthly_date = dofm( dofq(given_date)) Gen weekly_date = dofw( dofm(given_date)) Gen monthly_date = dofm( dofw(given_date)) The second column in the following table provides an example of a given format in which the date is already recorded, and the third column presents the code which shall convert the date to the desired frequency. If we already have dates in weekly, monthly, or quarterly frequencies, we can convert them back to daily dates and then to other frequencies. The file extension should be changed from doc to do after download. To see the codes in action, download this do file and execute. The second column in the following table provides an example of a given format in which the date is already recorded, and the third column presents the code which shall create a daily date. If we already have dates in weekly, monthly, or quarterly frequencies, we can convert them back to daily dates. Gen year = year(daily_date) From other frequencies to daily * Now convert the variable text to Stata dateįrom daily to other frequencies From daily to We can do that by using the %tdformat, for example, we can use the code format mydate %td textĮxample using some data * Enter example data Once the date is converted into a Stata readable format, we need to format the date so that the visual display of the date is human-readable. To convert them into a Stata date, the example code is shown in the second column. In the following table, the first column shows different date formats in which the date is already recorded and brought into Stata. Before we can use the Stata time-series or panel-data capabilities, we need to convert the string date to a Stata date. (2001) modelĬopying data from the internet, CSV files, or other sources into Stata will record the date as a string variable, shown with red color. The implied cost of capital (ICC) | GLS model | Stata | Gebhardt et al.Paid Help – Frequently Asked Questions (FAQs).
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