mulitcomp and covariates

[Karen_Byron@bd.com]

I almost always resort to manually generating
the lmat when I use the multicomp command with a covariate.  Here
is an example.

From the help:
# non-simultaneous intervals for adjusted
mean fuel mileage, 
#   adjusting to both  Weight=2500 and Weight=3500 
lmancova.fuel <- lm(Fuel~Type+Weight, data="" 
multicomp(lmancova.fuel, adjust=list(Weight=c(2500, 3500)), comparisons="none",
method="lsd", error.type="cwe") 

This gives the following output:
95 % non-simultaneous confidence intervals
for specified 
linear combinations, by the Fisher
LSD method 

critical point: 2.0057 
response variable: Fuel 

intervals excluding 0 are flagged by
'****' 

        Estimate
Std.Error Lower Bound Upper Bound      
Compact     3.88    
0.113        3.66        4.11 ****
  Large     4.81  
  0.213        4.38        5.24
****
 Medium     3.99  
  0.171        3.64        4.33
****
  Small     4.37  
  0.267        3.84        4.91
****
 Sporty     3.69  
  0.135        3.42        3.96
****
    Van     5.30
    0.137        5.02      
 5.57 ****
which doesn't indicate what value the
Weight was set.

I find the lmat surprising
round(multicomp(lmancova.fuel, adjust
= list(Weight = c(2500, 3500)), comparisons = "none", method
= "lsd", error.type = "cwe")$lmat, 3)
         
  Compact Large Medium Small Sporty  Van 
(Intercept)       1
    1      1     1      1
   1
TypeCompact       1
    0      0     0      0
   0
  TypeLarge      
0     1      0     0      0
   0
 TypeMedium      
0     0      1     0      0
   0
  TypeSmall      
0     0      0     1      0
   0
 TypeSporty      
0     0      0     0      1
   0
    TypeVan    
  0     0      0     0    
 0    1
     Weight    2500
 3500   2500  3500   2500 3500

How could I get the bias's at both 2500
and 35000, i.e. all types at Weight = 2500 and Weight = 35000 within 1
call to multicomp (so can plot) and no manual lmat?
I will summarize responses set just
to me.
Thanks,

Karen J Byron
Statistical Analysis

BD
1 Becton Drive, Franklin Lakes, NJ 07417 USA   MC: 078
tel: 201-847-5923    fax: 201-847-5887
E-mail: karen_byron@bd.com   Website: www.bd.com

---

******************************************************************* IMPORTANT MESSAGE FOR RECIPIENTS IN THE U.S.A.: This message may constitute an advertisement of a BD group's products or services or a solicitation of interest in them. If this is such a message and you would like to opt out of receiving future advertisements or solicitations from this BD group, please forward this e-mail to optoutbygroup@bd.com. ******************************************************************* This message (which includes any attachments) is intended only for the designated recipient(s). It may contain confidential or proprietary information and may be subject to the attorney-client privilege or other confidentiality protections. If you are not a designated recipient, you may not review, use, copy or distribute this message. If you received this in error, please notify the sender by reply e-mail and delete this message. Thank you. ******************************************************************* Corporate Headquarters Mailing Address: BD (Becton, Dickinson and Company) 1 Becton Drive Franklin Lakes, NJ 07417 U.S.A. *******************************************************************