# Developmental Final

naturalistic observation
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an index(r) of the extent to which individuals scores on one variable are systematically associated with their scores on another variable.

ranges from range is -1.00 to +1.00

Stronger= Closer to +1 or -1

Weaker= Closer to 0 direction is + or -

both low numbers or both high numbers= positive correlation

both opposite numbers= negative correlation
2its not good vs bad its together vs against each other
testing different age groups at one time, testing differences and not age changes. 2 or more age groups studied at one point in time. Results are faster than longitudinal testing because you are testing the ages at the same time, looking for developmental differences

-age differences (hints at developmental trends)
-fast and inexpensive

-no information about development of individuals (comparing group averages)
-age effects confounded with cohort effects (BUT..cohort effects no problem if age groups are closer in range)(ex. 2yo and 4yo)
testing age changes over time, studying one group over time for developmental change. time span doesn't matter, can be life time or just a few weeks.

-prospective
-age changes (development of individuals)
-links between early experiences and later behavior