Table 1 Physical meanings, judgment conditions, and assignments of decision variables in the training set.
From: Research on water inrush early warning of coal seam floor based on naive Bayes classification
Decision variable | Physical meaning | Judgment condition | Assignment |
|---|---|---|---|
\({x_1}\) | \(\Delta {\rho _{21}}=\frac{{{\rho _2} - {\rho _1}}}{{{\rho _1}}}\) | \(< - 0.05\) | 1 |
\(\geqslant - 0.05\) | 0 | ||
\({x_2}\) | \(\Delta {\rho _{32}}=\frac{{{\rho _3} - {\rho _2}}}{{{\rho _2}}}\) | \(< - 0.05\) | 1 |
\(\geqslant - 0.05\) | 0 | ||
\({x_3}\) | \(\Delta {\rho _{43}}=\frac{{{\rho _4} - {\rho _3}}}{{{\rho _3}}}\) | \(< - 0.05\) | 1 |
\(\geqslant - 0.05\) | 0 | ||
\({x_4}\) | \(\Delta {\rho _{32}} - \Delta {\rho _{21}}\) | \(<0\) | 1 |
\(\geqslant 0\) | 0 | ||
\({x_5}\) | \(\Delta {\rho _{43}} - \Delta {\rho _{32}}\) | \(<0\) | 1 |
\(\geqslant 0\) | 0 |
