## 3 Results
For the alternative paper 70R30B, the values of Wald statistics (41.52813) indicate an even more significant statistical impact of the paper on the print-through (_Print-through M_) compared to the reference category, due to a very low \(p\)-value (\(p\) = 0.0000). The Wald statistic value for the third alternative paper 70R30T of 39.60972 and a \(p\)-value of 0.000 indicate a very significant difference compared to the reference paper R when considering the print-through (_Print-through M_). Looking at the variables of density (_Density M_) and penetration (_Penetration M_), it can be concluded that there is no statistically significant relationship between them and the print-through (_Print-through M_), given the obtained values of Wald statistics of 1.92377 with a \(p\)-value of 0.16544 for density (_Density M_) and Wald statistics of 1.60490 with a \(p\)-value of 0.20521 for penetration (_Penetration M_). The results of this analysis demonstrate that the type of paper, unlike density (_Density M_) and penetration (_Penetration M_), has a statistically significant impact on the print-through (_Print-through M_). All three types of alternative papers showed significant differences compared to the reference paper R, although they are more pronounced for papers 70R30B and 70R30T. However, when observing which alternative paper exhibits properties most similar to the reference paper, the Wald statistic values (70R30W: 12.36398, 70R30B: 41.52183, and 70R30T: 39.60972) and \(p\)-values were compared again. It can be concluded that the 70R30W paper has the highest \(p\)-value, meaning it is least likely to differ from the reference paper concerning the print-through variable (_Print-through M_). Therefore, based on these data, 70R30W would be closest to the reference paper when observing the print-through of papers printed in magenta color. Observing the obtained values of the Wald statistics and \(p\)-values for yellow prints, it can be concluded that for the alternative paper 70R30W (Wald statistics = 80.78472 and \(p\) = 0.0000), there is a very significant difference between paper with the addition of wheat straw pulp and the reference paper R made only from recycled wood pulp in terms of print-through (_Print-through Y_). Furthermore, for the alternative paper 70R30B, the values of Wald statistics (1.41681) with a \(p\)-value of 0.23393 suggest that there is no statistically significant difference between it and the reference paper R. This indicates that its characteristics in terms of print-through (_Print-through Y_) are equivalent to those of the reference paper. For the third alternative paper 70R30T, the values of Wald statistics (9.81380) and \(p\)-value (0.00173) indicate that there is a statistically significant difference in the impact of the paper composition on the print-through (_Print-through Y_) compared to the reference paper R.  
From the analysis of the optical ink density variable (_Density Y_), it can be concluded that there is no statistically significant association with print-through (_Print-through Y_), given the Wald statistics value of 0.08607 and a \(p\)-value of 0.76924. However, when observing the impact of ink depth penetration (_Penetration Y_) on the print-through (_Print-through Y_), the analysis results indicate a significant influence of penetration on the print-through,as evidenced by the Wald statistics value of 9.56031 with a \(p\)-value of 0.001988. This suggests that as ink depth penetration increases, the value of the print-through also rises. All the above leads to the conclusion that the alternative paper with the addition of wheat straw pulp (70R30W) significantly differs from the reference paper R when observing the print-through. The alternative paper with the addition of trticle straw pulp (70R30T) also shows a difference, but not as much as 70R30W, while paper with the addition of barley straw pulp (70R30B) is most similar to the reference paper as there is no significant statistical difference when observing the print-through on papers printed with yellow ink.