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| From | Andrew Nicholson <andrew5@k-state.edu> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: RE: How do I properly tell Stata this data is Panel Data? |
| Date | Fri, 12 Oct 2012 21:19:15 -0400 (EDT) |
Thank you for your response. I went into the original data set and created a new quarter variable that ranges from 2001q1 - 2008q4 for all counties. xtset CountryNum quarter This command now gives me this response "varlist: quarter: string variable not allowed." Is there an easy solution to this? Andrew Nicholson ----- Original Message ----- From: "Nick Cox" <njcoxstata@gmail.com> To: statalist@hsphsun2.harvard.edu Sent: Friday, October 12, 2012 6:12:38 PM Subject: Re: st: RE: How do I properly tell Stata this data is Panel Data? This advice is quite incorrect: -xtset- or -tsset- will not accept -quarter- as a time variable, because there are repeated values within each panel. You are best advised to calculate a quarterly date that combines the two time variables. gen qdate = yq(year, quarter) format qdate %tq xtset countynumber qdate Nick On Fri, Oct 12, 2012 at 11:08 PM, Sun Yutao <yutao.sun@hotmail.com> wrote: > I think you should set the quarter as your time axis. And when you need to estimate something that is year-wide, you take sum or average depending on what you want exactly. Andrew Nicholson > Essentially my data looks as follows: > > County CountyNumber Year Quarter ...................... > Allen 1 2001 1 > Allen 1 2001 2 > Allen 1 2001 3 > Allen 1 2001 4 > Allen 1 2002 1 > ... ... ... ... > Allen 1 2008 4 > Anderson 2 2001 1 > ... ... ... ... > Anderson 2 2008 4 > > It continues this way for 105 counties. My question is how do I use the xtset command when I have both Year and Quarter as time variables. County and CountyNumber are both classifying the same thing in the dataset. > * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/