X_O = X_T + X_S + X_R represents the pure score model.

Name: X O = X T + X S + X R represents the pure score model.
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The equation represents a decomposition of the observed score (OS) into true score (TS), systematic error (SS), and random error (RS), not the pure score model. The pure score model typically refers to the idea that an observed score is the sum of a true score and an error score, without explicitly breaking down the error into systematic and random components.

XO = XT + XS + XR Represents the Pure

X_O = X_T + X_S + X_R Represents the Pure