factorial ezANOVA doubt

[Rodrigo Plei]

Dear colleagues,

I have the results of a numerical experiment on larval transport.

I want to test which factor(s) hold(s) influence on larval transport. In my case, the response variable is the percentage of successfully transported larvae ("transport_success")

Thus, by the end of the day, I need a factorial ezANOVA Table that should look like this:

area  (three hatching areas)                                                                       # factor

month (varying from January to December)                                                # factor

year (varying from 2002 to 2010)                                                                # factor

transport (transport type, two levels: "Lagrangian" and "vertical migration")   # factor

area x transport

month x transport     # the interactions I am interested in

year x transport

From what I learned, my script should look like more or less this

larva_anova <-rt_anova = ezANOVA(

                                     data = data                          # my dataset

                                   , dv = transport_success          # my dependent variable

                                   , wid = ??

                                   , within = .(area,month, year)   # my factors (one spatial, two temporal)

                                   , between = transport              # here I understand that transport type corresponds to my treatment (Lagrangian = control, vertical migration = treatment) 

)

My doubt rests on the "wid" argument. I am having difficulty in which factor I must use here to get the Table I posted above.

Any help will be greatly appreciated!

Rodrigo