Primary data
+
Suitable for aim
Authentic
-
time consuming
Spend too much money one to collect
Secondary data
+
Large data sets
Saves time
-
Not suitable for current study
Not relevant to the aim
Longitudinal research
+
Know the effect of age
Controlled participant variables
-
Cohort effect
Biased sample
Cross sectional research
+
Easy comparison
Saves time
-
No control participant variable
Cohort effect
Cross cultural research
+
Effect nature vs nurture
Biased understanding
-
Biased researchers
Procedures and test develop by west
Meta analysis
+
Validity
Generalizability
-
Selection bias
Used different methods