Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.
From | Natalie Trapp <natalie.trapp@zmaw.de> |
To | statalist@hsphsun2.harvard.edu |
Subject | Re: st: "insufficient observations" with xtreg |
Date | Fri, 02 Jul 2010 17:03:25 +0200 |
On 7/2/2010 4:11 PM, Kay Walker wrote:
If you only have 2 years, that's not enough. The time intervals have to either be more frequent or you need more years to perform it this way. I assume you have x1 at start, 1 year and 2 years; x2 at the same intervals etc. ie. only 2 observations per x after baseline.Cheers ----- Natalie Trapp wrote:Dear all,this question has already been posed four years ago by Liu Ying on statalist, but I couldn't find an answer to it.I declared the dataset to be a panel dataset: . xtset id Year panel variable: id (weakly balanced) time variable: Year, 2002 to 2004 delta: 1 year(the dataset is not complete yet, so I only have two years so far and more than 44.000 individuals)When I regress the model, . xtreg y x1 x2 x3 x4 x5 x6 I get the error: "insufficient observations". Why do I get this error?Is this maybe due to the short time period or due to missing observations for some individuals?Many thanks in advance. Natalie _______________________________________ Research Unit Sustainability and Global Change Centre for Marine and Atmospheric Sciences Bundesstraße 55 D-20146 Hamburg * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/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/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/statalist/faq * http://www.ats.ucla.edu/stat/stata/