[R] lm and anova

[Sara Sjöstedt de Luna]

Hi!

We have run a linear regression model with 3 explanatory variables and get the output below.
Does anyone know what type of test the anova model below does and why we get so different result in terms of significant variables by the two tables?

Thanks!

/Sara

> summary(model)
Call:
lm(formula = log(HOBU) ~ Vole1 + Volelag + Year)
Residuals:
      Min        1Q    Median        3Q       Max
-0.757284 -0.166681  0.009478  0.181304  0.692916
Coefficients:
             Estimate Std. Error t value Pr(>|t|)
(Intercept) 80.041737  12.018726   6.660 1.40e-07 ***
Vole1        0.005521   0.041626   0.133   0.8953
Volelag      0.033966   0.018392   1.847   0.0738 .
Year        -0.035927   0.006027  -5.961 1.08e-06 ***

anova(model)
Analysis of Variance Table
Response: log(HOBU)
          Df Sum Sq Mean Sq F value    Pr(>F)
Vole1      1 1.7877  1.7877 13.1772 0.0009486 ***
Volelag    1 0.5817  0.5817  4.2878 0.0462831 *
Year       1 4.8205  4.8205 35.5323 1.082e-06 ***
Residuals 33 4.4769  0.1357


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