In this model, n represents the number of compounds contributed to build the model. The R value is the correlation coefficient; the closer R is to 1, the better the goodness of fit of the equation. 39 The Fcalc/Ftable value represents the ratio between the variance of the calculated and tabulated values and, therefore, indicates that the regression relationships were statistically significant and did not occur by chance. Q2 serves as a criterion of robustness and predictive ability of the regression equation. The high Q2 value (>0.5) suggests the model’s ability to give an accurate prediction. The low s (the standard error of estimates) and SPRESS values suggest that the model is statistically significant for activity prediction. 39
The new r property value 0.976 out of model 6 exhibited that there is an effective correlation within independent variables (descriptors) and cytotoxic situations of one’s xanthones. I verified one to 97.6% of your own changed cytotoxic hobby of your own analyzed xanthones are caused from the modification of qC1, qC2, qC3, time dipole, and logP. These types of findings have been highly relevant to an earlier study you to indicated that architectural amendment of your own fragrant band C, especially at the C1 and C2 positions, predict improvement of cytotoxic activity of one’s xanthone substances. For this reason, structural amendment is recommended toward band A beneficial otherwise C. 41