It is a graphical presentation of frequency distribution. Variable characters of the different groups are indicated on the horizontal line (x-axis) called abscissa while frequency, i.e. number of observations is marked on the vertical line (y-axis) called ordinate. Frequency of each group will form a column or rectangle. Such a diagram is called ‘histogram’ and is made use of in presenting any quantitative data such as the one given below.
This topic covers: Histogram, Frequency Polygon, Frequency Curve, Line chart or Graph, Scatter or XY Diagram, Bar Diagram, Pie or Sector Diagram, Pictogram or Picture Diagram, Semi Logarithmic Graphs, Applications of Semi Logarithmic plots.