Question

What is Index Number? Explain the difficulties or problems involved while constructing Index Number.​

Answer 1

An index number is the measure of change in a variable (or group of variables) over time. ... Index numbers are one of the most used statistical tools in economics. Index numbers are not directly measurable, but represent general, relative changes. They are typically expressed as percents..Every item cannot be included while constructing an index number and hence once has to select a sample. It is also necessary to decide the grade or quality of the items to be included in the index. Index numbers shall give wrong result if at one time one set of qualities is included and at another time another set.