I'm currently analysing data I have collected looking at the rate of interaction between a species of shark and 24 different teleost fish species.
My variables are:
x = species and y = rate of aversion
In trying to calculate their statistical difference from one another I have become confused as to which test to use.
When trying to conduct an Anova or Kruskal-Wallis test (due to the data's non-normality) followed by a Tukey HSD test, I ran up against the problem that they compare means and, as i only have one measurement per group, I am met with 'NaNs' as my output.
If someone could guide me to or advise me on the correct test for this data, I would be evry thankful.
My data is arranged like this:
species ----------aversion_rate (per individual)------group size
|Orangespot_surgeonfish ----------- 0.5-----------------------2
|Yellowback_fussilier ----------------6.09----------------------58
|Threadfin_butterflyfish ------------3.5------------------------2
|Kleins_Butterflyfish --------------- 1.5------------------------0
|Racoon_butterflyfish --------------0.49-----------------------6
|Copperband_butterflyfish --------4.5-------------------------2
|Striped_large-eye_bream ---------1.21-----------------------9
|French_grunt -------------------------0.4------------------------5
|Barred_flagtail -----------------------0.75----------------------21
|Cleaner_wrasse ----------------------0-------------------------2
|Humpback_snapper ---------------3.25----------------------4
|Bluelined_snapper ----------------0.39-----------------------15
|Stripey --------------------------------1.47-----------------------21
|Blackbar_soldierfish ---------------3.8------------------------5
|Unicorn_tang -----------------------1----------------------------2
|Bignose_unicornfish ---------------0--------------------------2
|Red-toothed_triggerfish ----------3--------------------------3
|Harlequin_sweetlips ---------------2--------------------------4
|Yellowbanded_sweetlips-----------5--------------------------2
|Emperor_angelfish ------------------2--------------------------1
|Yellowface_angelfish ----------------3--------------------------1
|Reef_squirrelfish ----------------------9.5-----------------------4
|Sabre_squirrelfish --------------------0.8------------------------5
|Foxface_rabbitfish -------------------0.91-----------------------13