I am having trouble with getting AIC statistics. I have developed a number of ancova models using the lm function. I am trying to get a number of AIC statistics suggested by Burnham and Anderson (2002) including raw AIC values, AICc values, Akaike weights, and Delta AIC. When I use the AIC function in (stats), I only get a single AIC value including degrees of freedom. When I use the summary statement as suggested in the (aod) package, I do not get the resulting AIC statistics. What am I doing wrong? Is this a product of using the lm function for my models? I have even investigated the use of extractAIC, but that does not provide me with the statistics I am looking for as well. Do you have any suggestions? In addition, I am also curious if there is a package or procedure for model averaging. Thank you!
Benjamin Zuckerberg Doctoral Candidate State University of New York College of Environmental Science and Forestry Illick 244A, 1 Forestry Drive Syracuse, New York 13210 Tele: (315) 470-6985 E-mail: bzuckerb at syr.edu