The disadvantage of correlation research is that information pulled from data analysis is very limited. This type of research only shows if there is a positive correlation, negative correlation, or no correlation between data sets.
Correlation research is more accurately described as method of data analysis. When plugged into a correlation equation it is possible to determine how much two variable relate. This can also be shown visually by plotting two variables on the x and y axis of a scattergram or scatter chart .
Correlation does not show nor illustrate causation, meaning that it does not prove that one variable causes the other.