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Robert, d retherford, Minja, kim choe. (1993). STATISTICAL MODELS FOR CAUSAL ANALYSIS . Kanada: Willey & sons.

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Robert, d retherford, Minja, kim choe. STATISTICAL MODELS FOR CAUSAL ANALYSIS. Kanada: Willey & sons, 1993. Text.

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Robert, d retherford, Minja, kim choe. STATISTICAL MODELS FOR CAUSAL ANALYSIS. Kanada: Willey & sons, 1993. Text.

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Robert, d retherford, Minja, kim choe. STATISTICAL MODELS FOR CAUSAL ANALYSIS. Kanada: Willey & sons, 1993. Print.