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X. Où, x la valeur obtenue, ? l'écart type assigné Le score Z présente l'avantage de s'affranchir de nombreux paramètres tels que la concentration, la nature de l'échantillon ou encore le principe physique de l

. La, peut être déterminée par consensus des laboratoires participants (moyenne des résultats obtenus pour une même caractéristique), par l'utilisation d'un étalon ou par un seul laboratoire qui fait alors office de référence

L. Figure and 2. , 10 ci-contre est la carte de contrôle obtenue après la conversion en scores Z

. Ainsi, après les deux équations précédentes, le rendement massique en bois préhydrolysé peut être calculé selon l'équation suivante : Équation 4, p.29