Programming the statistical procedures from SAS

Comparison of slopes in ANCOVA analysis

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Comparison of slopes in ANCOVA analysis

Hi,

I've made an experiment with two products used at several dose rates. I did an ANCOVA with the model Y=Dose Treatment Dose*Treatment.

I've found the interaction as significant. So the slopes of the dose responses are different from a treatment to another.

Now I would like to compare the slopes (given in the model) and compute a ratio with a confidence intervalle. I've found something on the net with the Fieller's theorem that I could run in Excel, but I would prefer to have the result by SAS.

Regards
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