Histogram Assignment Help

Frequency Distribution Graphical Representation - Histogram

Statistics >> Histogram

Histogram is a bar diagram which represents a, frequency distribution with continuous classes. The width of all bars is equal to class interval and heights of the bars are proportional to the frequency of the respective classes. Each rectangle is joined with the other so as to give a continuous picture.

In case of unequal class intervals there will be rectangles of unequal width. If it is desired to keep width of all the rectangles equal then, height will be adjusted proportionally so that area of the rectangle remains the same. 

A Few Points to Remember

1.     To draw histogram from discrete frequency distribution consider the given values as the midpoint of the continuous classes assuming that the frequencies are uniformly distributed throughout each class.

2.     If the class intervals are of inclusive type then change the class limits into class boundaries.

3.     Histogram and Historigram: The word-histogram should not be confused with the term historigram which stands for time series graphs. Graphs of continuous time series are known as historigrams. If the absolute value of the variable are taken into consideration the graphs obtained are known as absolute historigrams. Historigrams may be constructed on the natural scale or on the ratio scale. 


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