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Interpolation is a procedure to estimate an intermediate data value by the use of a formula. A common example is the quarterly estimation of output of non-pro…fit institutions serving households (NPISH) from annual national accounts.

A quarterly pattern for interpolation may be derived:

• from previous (discontinued) survey data;
• from proxy variables;
• as a smooth mathematical function.

Further information

• Handbook on Data Quality - Assessment Methods and Tools

Related concepts

• Estimation
• Extrapolation