
Dear R community,
 
I am wondering what experimental design I am dealing with? I study the effect of daily air temperature on daily body temperature of the overwintering turtles (i.e. sleeping in soil). The model is a cosine wave with the air temperature as a covariate. 
 
Objects are 19 overwintering turtles. Data were combined over the three years. Each turtle was studied only once during these years, while 2 turtles were studied during two years (see table below). The study area was the same for these three studied years. Turtles were overwintering in different sites within this area. 
 
Is that correct to treat the study years as a random effect? I understand that I should incorporate autocorrelation model to account for daily variations in turtle’s body temperature. Is there a spatial correlation between the three study years, since the study was done within the same area?
 
 
 
 





Study year


turtle#


2005 year

 


 

1


 

2


 

3


 

4


 

5


 

6


 

7


2006 year

 


 

8


 

9


 

0


 

11


 

12


2006 year

 


 

13


 

14


 

15


 

4


 

16


 

17


 

18


 

12


 

19
 
Thanks for your help,

Julia






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