question about Type III sums of squares as computed in "CAR'

I have attached the example data and the r-code and r messages.The data are example measurements of exposures on 2 occupations ( a and b)on 11 sampling days.  Each occupation  has one measurement per day.  The 11 sampling days are at 4 sites:  3 days at 3 of the sites and  2 days at 1 site.  In addition, there were three  workers who did the second occupation  , labelled 6,7,8, for the variable idb.  I need the SAS type III sums of squares for each of the variables in the model, but you can see the error message in the R code: there are aliased coefficients in the model In SAS I believe that this problem is dealt with by placing constraints on the parameters.I would appreciate any suggestions.  I think that maybe I am formulating the model wrong.  Thanks,Stanley Shulman       

---------- Forwarded Message ----------
From: "m51988mnew at juno.com" <m51988mnew at juno.com>
To: r-sig-mixed-models at r-project.org
Subject: question about Type III sums of squares as computed in "CAR' 
Date: Wed, 18 Nov 2015 02:25:03 GMT


When I use "Anova" from the car library, I cannot get Type III sums of
 squares for nested data.  Maybe I am using the program wrong. SAS gives the
 Type III sums of squares. Thanks for any thoughts.Stanley Shulman

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