[R] Anyone can help me with a model I have looking for?

[Manuel Ramon]

Hello to everyone.
I don't know if that forum is the rigth place to post my question but I
would be greatful for your help.
My problem is as follow: I have a performance trait as a dependent variable
and measures of temperature in different days as a covariate. I assume that
there is an accumulative effect of the temperature and heat load is faster
than heat loss, that is, is necessary more time to drop the accumulative
heat load. The question is that over a accumulative heat load threshold my
performance trait stars to fall and i would like to estimate this threshold.
How could i do that?

Thanks again. 

-----
Manuel Ramón Fernández
Group of Reproductive Biology (GBR)
University of Castilla-La Mancha (Spain)
mramon at jccm.es
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