the lowest + highest numbers

the trend (the starting, ending figures + sth else necessary)

number 0, missing information

equal numbers

the greatest difference

the fastest change

grouping information

adding numbers together and make comparisions

identifying the correlations between 2 or more graphs

1 group of the upward trend, the other of the downward trend

1 group with more males, the other group with more females

1 group of developing countried, the other group with developed counterparts

1 group of one way development (up and/or downe), the other with fluctuations

1 group of Ameriacan continent, the other of Europe

1 group of indoor activities, the other of outdoor ones

1 group of public transport, the other of private transport

1 group of land travel, 1 group of air travel, and the other group of sea travel