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mat50_s1
2007 May 02
3
ED50 from logistic model with interactions
...response, 0 for immature, 1 for mature. There
are 3 Seasons.
The Season * Size interaction is significant. I would like to compare the
size at 50% maturity between Seasons, which I have calculated as:
Mat50_S1 <- -fit$coef[1]/fit$coef[4]
Mat50_S2 <- -fit$coef[2]/(fit$coef[4] + fit$coef[5])
Mat50_S3 <- -fit$coef[3]/(fit$coef[4] + fit$coef[6])
But I am not sure how to calculate the standard error around each of
these estimates. The p.dose function from the MASS package does this
automatically, but it doesn’t seem to allow interaction terms.
In Faraway(2006) he has an example using the delt...
2007 May 03
0
unscrible pls
...e. There
> are 3 Seasons.
>
> The Season * Size interaction is significant. I would like to compare the
> size at 50% maturity between Seasons, which I have calculated as:
>
> Mat50_S1 <- -fit$coef[1]/fit$coef[4]
> Mat50_S2 <- -fit$coef[2]/(fit$coef[4] + fit$coef[5])
> Mat50_S3 <- -fit$coef[3]/(fit$coef[4] + fit$coef[6])
>
> But I am not sure how to calculate the standard error around each of
> these estimates. The p.dose function from the MASS package does this
> automatically, but it doesn�t seem to allow interaction terms.
>
> In Faraway(2006) he h...