Dear R users How should one approach diagnosing a regression on panel data? I am mostly talking about the "within" or Fixed Effects case. There are some panel-specific tests and diagnostics explained in require(plm) vignette("plm") But I was wondering if diagnostics on ordinary linear models (as explained here[1], for example) also apply to panel regressions. Perhaps someone could suggest a good reference? Thank you Liviu [1] http://socserv.socsci.mcmaster.ca/jfox/Courses/Brazil-2009/slides-handout.pdf -- Do you know how to read? http://www.alienetworks.com/srtest.cfm http://goodies.xfce.org/projects/applications/xfce4-dict#speed-reader Do you know how to write? http://garbl.home.comcast.net/~garbl/stylemanual/e.htm#e-mail