Thank you so much, Steve. The work is to examine what kinds of factors would affect whether a nestling bird would be fed during each feeding event.  The SAS code and type 3 output are as follows: proc glimmixdata = sasuser.EACHALLOCATION  ; class  adult  nestling gender  nest position  begging CB  No_feeding_event; title GLIMMIX Each Feeding preferenc; model F_N(event='1') = adult  gender  position begging  Tsize  CB adult*gender  adult*position  adult*begging adult*Tsize  adult*CB    gender*position        gender*begging    gender*CB  gender*Tsize position*begging   position*CB  position*Tsize   begging*CB begging*Tsize   Tsize*CB NO_begging_nestlings        /solution  ddfm=kr link = logit   dist = binomial ; random intercept  no_feeding_event / subject=nest; run; Type III Tests of Fixed Effects Effect Num DF Den DF F Value Pr > F Adult 2 6925 1.69 0.1845 Gender 1 9237 0.04 0.8491 Position 1 9237 844.43 <.0001 Begging 1 9237 338.44 <.0001 Tsize 1 9237 2.06 0.1516 CB 1 32.61 0.22 0.6394 Adult*Gender 2 9237 3.66 0.0259 Adult*Position 2 9237 0.17 0.8460 Adult*Begging 2 9237 4.29 0.0138 Tsize*Adult 2 9237 4.48 0.0114 Adult*CB 1 7807 0.18 0.6747 Gender*Position 1 9237 2.61 0.1060 Gender*Begging 1 9237 2.12 0.1454 Gender*CB 1 5463 1.47 0.2253 Tsize*Gender 1 9237 0.01 0.9216 Position*Begging 1 9237 9.41 0.0022 Position*CB 1 9237 1.81 0.1785 Tsize*Position 1 9237 1.43 0.2313 Begging*CB 1 9237 2.19 0.1390 Tsize*Begging 1 9237 0.32 0.5746 Tsize*CB 1 9237 0.23 0.6333 No_begging_nestlings 1 2185 45.46 <.0001 ... View more