R-help,

I'm using the "update" command for a multiple regression model and it is
just not working:

> update(model1, . ~ . – temp:wind:rad,data=ozone.pollution)
Error: unexpected input in "model2<-update(model1, . ~ . –"

> summary(model1)

Call:
lm(formula = ozone ~ temp * wind * rad + I(rad^2) + I(temp^2) +
    I(wind^2), data = ozone.pollution)

Residuals:
    Min      1Q  Median      3Q     Max
-38.894 -11.205  -2.736   8.809  70.551

Coefficients:
                Estimate Std. Error t value Pr(>|t|)
(Intercept)    5.683e+02  2.073e+02   2.741  0.00725 **
temp          -1.076e+01  4.303e+00  -2.501  0.01401 *
wind          -3.237e+01  1.173e+01  -2.760  0.00687 **
rad           -3.117e-01  5.585e-01  -0.558  0.57799
I(rad^2)      -3.619e-04  2.573e-04  -1.407  0.16265
I(temp^2)      5.833e-02  2.396e-02   2.435  0.01668 *
I(wind^2)      6.106e-01  1.469e-01   4.157 6.81e-05 ***
temp:wind      2.377e-01  1.367e-01   1.739  0.08519 .
temp:rad       8.403e-03  7.512e-03   1.119  0.26602
wind:rad       2.054e-02  4.892e-02   0.420  0.67552
temp:wind:rad -4.324e-04  6.595e-04  -0.656  0.51358
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 17.82 on 100 degrees of freedom
Multiple R-squared: 0.7394,     Adjusted R-squared: 0.7133
F-statistic: 28.37 on 10 and 100 DF,  p-value: < 2.2e-16

>

Can anyone help with this?

Thanks in advance

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