[R] Accessing elements of plm outputs

[ECAMF]

Dear all,

I've just migrated from STATA to R for runing panel regressions and I was
very happy to discover the plm package. However, I have a problem when
trying to access the "Total Sum of Squares" and "Residual Sum of Squares" on
this output:

> summary(output)

Oneway (individual) effect Within Model

Call:
plm(formula = Y ~ X1 + X2, data = db, model = "within")

Unbalanced Panel: n=10, T=9-11, N=108

Residuals :
   Min. 1st Qu.  Median 3rd Qu.    Max. 
 -6.500  -2.200  -0.374   1.550   8.730 

Coefficients :
         Estimate Std. Error t-value Pr(>|t|)    
X1       113.302650   8.517736  13.302   <2e-16 ***
X2       -0.084414   0.109625  -0.770   0.4432    
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 

Total Sum of Squares:    3208.3
Residual Sum of Squares: 1059.6
F-statistic: 97.3365 on 2 and 96 DF, p-value: < 2.22e-16


I would like to do so because I'm running some hundreds times a similar
regression and I want to store those results in a vector and then plot them.
I've tried to do so with 

>summary(output)[] 

but neither the "Total Sum of Squares" or the "Residual Sum of Squares" are
on the list.

I would be glad if somebody can help me.

Thank you very much!

Eduardo Marinho.
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