Difference between revisions of "RAS Technique"
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== Definition == | == Definition == | ||
| − | '''RAS Technique''' or RAS Procedure or RAS algorithm | + | '''RAS Technique''' or RAS Procedure or RAS algorithm or biproportional matrix balancing technique is an algorithm originally introduced to update IO-tables in situations in which only limited survey data are available for the projection year. |
| − | + | The method is used in the preparation of updated I-O accounts that are based on partial survey information. The technique applies row and column balancing factors iteratively until the adjusted matrix (the transactions table) satisfies the row and column totals (commodity and industry output). The technique converges to a solution resulting in a balanced I-O matrix.<ref>Concepts and Methods of the US Input-Output Accounts. K.J.Horowitz, M.A.Planting, 2009</ref> | |
== Procedure == | == Procedure == | ||
| − | Assume that an input-output direct coefficients table for an n-sector economy for a given year in the past ( | + | Assume that an input-output direct coefficients table for an n-sector economy for a given year in the past (designate this as year “0”) and that we like to update those coefficients to a more recent year (which we will designate year “1”). |
| − | The RAS technique generates an estimate of these coefficients from | + | The RAS technique generates an estimate of these coefficients from 3 n pieces of information for the year of interest (year 1). |
| + | * total gross outputs, <math>x_j</math> | ||
| + | * total interindustry sales by sector | ||
== References == | == References == | ||
Revision as of 13:56, 19 February 2024
Definition
RAS Technique or RAS Procedure or RAS algorithm or biproportional matrix balancing technique is an algorithm originally introduced to update IO-tables in situations in which only limited survey data are available for the projection year.
The method is used in the preparation of updated I-O accounts that are based on partial survey information. The technique applies row and column balancing factors iteratively until the adjusted matrix (the transactions table) satisfies the row and column totals (commodity and industry output). The technique converges to a solution resulting in a balanced I-O matrix.[1]
Procedure
Assume that an input-output direct coefficients table for an n-sector economy for a given year in the past (designate this as year “0”) and that we like to update those coefficients to a more recent year (which we will designate year “1”).
The RAS technique generates an estimate of these coefficients from 3 n pieces of information for the year of interest (year 1).
- total gross outputs,
- total interindustry sales by sector
References
- ↑ Concepts and Methods of the US Input-Output Accounts. K.J.Horowitz, M.A.Planting, 2009
