A [ ] is a group difference at one point in time; a [ ] is a change over time.
A trend is a group difference at one point in time; a pattern is a change over time.
A pattern is a group difference at one point in time; a trend is a change over time.
A pattern is a group difference at one point in time; a correlation is a change over time.
A correlation is a group difference at one point in time; a trend is a change over time.