[R] Growth rate determination using ANCOVA

[Dieter Menne]

dschruth <dschruth <at> gmail.com> writes:

...I am 
>>worried that our null and alternative hypotheses should be swapped so
> that our test is more conservative (Ho=slopes are different ... ie
> still acclimating.)
> 
> Is there a way to specify my model that flips these hypotheses?

No, that not possible because of the "what means different" question. 0.1 ?
0.01? 10?. In medical research, you have to ask the researchers "what is a 
medically relevant improvement? An increase in survival time by 1 month?",
and then formulate "the difference is larger than 1 month with p=0.9". 
When you ask the researchers to supply the clinically relevant threshold 
value, most chicken out, and I remember quite a few fights because the 
ethics  committee want it.


Dieter