What is Historigram? Give the difference between Absolute Historigram

1.	What is Historigram? Give the difference between Absolute Historigram and Index Historigram.
Answer» The curve drawn on graph paper by presenting variables of time series is called ‗Historigram‘, because it reveals the past history of data. A time series is an arrangement of statistical data in a chronological order with reference to occurrence of time. Time period may be a year, quarter, month, week, days, hours etc. Such graphs may be drawn on natural scale or ratio scale. When actual values of a variable are plotted on a graph paper, it is called absolute historigram. Absolute historigram can be of (i) one variable (ii) two or more variables. Index historigrams are obtained by plotting index numbers of actual values on a graph paper. If index numbers are not given, the same may be calculated of the original values. It shows relative changes.

What is Historigram? Give the difference between Absolute Historigram and Index Historigram.

Answer»

The curve drawn on graph paper by presenting variables of time series is called ‗Historigram‘, because it reveals the past history of data. A time series is an arrangement of statistical data in a chronological order with reference to occurrence of time. Time period may be a year, quarter, month, week, days, hours etc. Such graphs may be drawn on natural scale or ratio scale.

When actual values of a variable are plotted on a graph paper, it is called absolute historigram. Absolute historigram can be of (i) one variable (ii) two or more variables.

Index historigrams are obtained by plotting index numbers of actual values on a graph paper. If index numbers are not given, the same may be calculated of the original values. It shows relative changes.

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