Table 9 Summary of the values of regression coefficients for RSM in geopolymer treated soil layer.

From: Effect of geopolymer treatment on the ultimate bearing capacity of sabkha soil under axial loading

Model

RSM

\(\:{\beta\:}_{0}\)

\(\:{\beta\:}_{1}\)

\(\:{\beta\:}_{2}\)

\(\:{\beta\:}_{3}\)

\(\:{\beta\:}_{4}\)

\(\:{\beta\:}_{5}\)

\(\:{R}^{2}\)

Mix & compact

-23.7

-94.3

34.4

-133.9

-21.4

300.4

0.98