To send content items to your account,
please confirm that you agree to abide by our usage policies.
If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account.
Find out more about sending content to .
To send content items to your Kindle, first ensure email@example.com
is added to your Approved Personal Document E-mail List under your Personal Document Settings
on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part
of your Kindle email address below.
Find out more about sending to your Kindle.
Note you can select to send to either the @free.kindle.com or @kindle.com variations.
‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi.
‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
Research methods in both behavioral genetics and personality are currently at a crossroads. This chapter examines the disagreement about the genetics of behavior by reformulating its methodological foundation of twin and family studies. It applies the reformulation of older methods to gain realistic understanding of the newer ones that capitalize on the availability of measured DNA. The chapter highlights a particularly problematic aspect of scientific inference in the human behavioral sciences: the inference of causality from nonexperimental data. Religiosity was measured using four items (rated on four-point or five-point ordinal scale) assessing importance of religion, frequency of prayer, attendance at religious services, and attendance at youth groups. Random effects model was estimated in monozygotic (MZ) twin pairs using PROC MIXED in SAS. Linkage analysis has been the earliest molecular method to be adopted in the study of behavior because it requires minimal knowledge of actual genetic sequence.