With simulations alone, however, it is impossible to determine if this is due to a decrease in competitive costs or an increase in indirect selection driven by stronger joint preferences by females with both preferences for males with both traits.
Although multiple preferences do not lead to direct (i.e. natural) selection for preference evolution, their presence is likely to increase the strength of indirect selection on preference and trait evolution, creating strong joint preferences in females with both preferences for males with both traits; this leads to a decrease in the initial preference strength required for evolution.
Future studies could use modeling strategies for example with joint distributions of preference parameters such that the independency assumption can be relaxed.
A joint evolution of preference and performance is not always observed, due to the need for coupling based on pleiotropy or by linkage disequilibrium between both traits (Futuyma and Moreno 1988; Forister et al. 2007).
The means that you become honest about topics such as expectations for when and where you'll hang out, the frequency at which you'll spend time with each other, the types of activities you guys want to do together, sexual preferences, joint adventures and activities, and your true thoughts and feelings.
Unmeasured confounding, such as bone quality, the anatomy of the hip joint, and the preferences of patient and surgeon would certainly also influence the results, but these considerations could not be addressed in our study.
Finally, a joint model combining revealed preference (observed adherence in the clinical trial) and stated preference data (DCE) will be estimated.
"The reason why these issues come up more is because Connecticut, like many other states, increasingly has a preference for joint legal custody, or co-parenting," Ms. Kaas said.
Patient preference in joint replacement may also vary by race, sex, and other sociodemographic factors [ 10– 16].
