hi,

I'm using the sem package, and I want to make sure I'm interpreting the output 
correctly. Here is an excerpt of my output. When I report the MWD error, should 
I say that 59% of the variation in MWD is not explained by the model, or that 
59% of the variation is explained, or something entirely different.  

Parameter Estimates
                   Estimate  Std Error z value  Pr(>|z|)                        
         
NplantRoots         0.462029   0.120803   3.82466 1.3095e-04   plantRoots <--- 
N             
...           
CoError             1.000011 0.151850   6.58553 4.5325e-11 Co <--> Co           
         
carbonateError      1.000009 0.156217   6.40142 1.5394e-10 carbonate   <--> 
carbonate      
MWDError            0.589788   0.092128   6.40185 1.5351e-10    MWD <--> MWD    
              

Thanks
Kathryn

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