> sessionInfo()
R version 2.15.0 (2012-03-30)
Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] grid      datasets  splines   utils     stats    
[6] graphics  grDevices methods   base     

other attached packages:
 [1] effects_2.1-0       colorspace_1.1-1   
 [3] nnet_7.3-1          nlme_3.1-103       
 [5] lattice_0.20-6      reshape_0.8.4      
 [7] plyr_1.7.1          catdata_1.0        
 [9] cacheSweave_0.6-1   stashR_0.3-5       
[11] filehash_2.2-1      BiocInstaller_1.4.3
[13] ctv_0.7-4           sos_1.3-1          
[15] brew_1.0-6          Hmisc_3.9-3        
[17] survival_2.36-12    MASS_7.3-17        

loaded via a namespace (and not attached):
[1] cluster_1.14.2 digest_0.5.2   tools_2.15.0  

# copy and paste the following:
library( catdata )
data( unemployment )
unempt <- unemployment
unempt$durbin <- unempt$durbin - 1
library( reshape )
unempt <-  melt( table( unempt ) )
unempw <- cast( unempt, age ~ durbin )
names( unempw ) <- c( 'age', 'short', 'long' )
modt <- glm( durbin ~ age, weights = value, family = binomial, data = unempt )
modw <- glm( cbind( short, long ) ~ age, family = binomial, data = unempw )
library( effects )
modt.ef <- effect( 'age', modt ) # works!
modw.ef <- effect( 'age', modw ) # doesn't work!
# Error in eval(expr, envir, enclos) : object 'age' not found
# end

______________________________________________
Professor Michael Kubovy
University of Virginia
Department of Psychology
for mail add:						for FedEx or UPS add: 
P.O.Box 400400					Gilmer Hall, Room 102
Charlottesville, VA 22904-4400	485 McCormick Road
USA							Charlottesville, VA 22903
		room	phone
Office:    B011	+1-434-982-4729
Lab:        B019	+1-434-982-4751
WWW:    http://www.people.virginia.edu/~mk9y/


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