# Rank condition

The rank condition is a necessary and sufficient condition for a set of simultaneous equations in an econometric system to allow identification of all its parameters from the estimated coefficients of the reduced form equations.wikipedia
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### Parameter identification problem

identificationidentification problemidentified
The rank condition is a necessary and sufficient condition for a set of simultaneous equations in an econometric system to allow identification of all its parameters from the estimated coefficients of the reduced form equations.
The rank condition is a necessary and sufficient condition for identification.

### Order condition

first order condition
* Order condition
However, a stronger argument is the rank condition which is both necessary and sufficient for identification.

### Necessity and sufficiency

necessary conditionnecessary and sufficient conditionsufficient condition
The rank condition is a necessary and sufficient condition for a set of simultaneous equations in an econometric system to allow identification of all its parameters from the estimated coefficients of the reduced form equations.

### System of equations

simultaneous equationssystems of equationssimultaneous equation
The rank condition is a necessary and sufficient condition for a set of simultaneous equations in an econometric system to allow identification of all its parameters from the estimated coefficients of the reduced form equations.

### Econometrics

econometriceconometricianeconometric analysis
The rank condition is a necessary and sufficient condition for a set of simultaneous equations in an econometric system to allow identification of all its parameters from the estimated coefficients of the reduced form equations.

### Parameter

parametersparametricargument
The rank condition is a necessary and sufficient condition for a set of simultaneous equations in an econometric system to allow identification of all its parameters from the estimated coefficients of the reduced form equations.

### Reduced form

reduced-form
The rank condition is a necessary and sufficient condition for a set of simultaneous equations in an econometric system to allow identification of all its parameters from the estimated coefficients of the reduced form equations.

### Matrix (mathematics)

matrixmatricesmatrix theory
The condition simply requires the matrix of all structural equations of the model to have full rank.

### Rank (linear algebra)

rankcolumn rankfull rank
The condition simply requires the matrix of all structural equations of the model to have full rank.