Table 1 Correlation strength.

From: Forecasting deep shale gas production using a ROA-optimized Transformer–Mamba hybrid network

ρ value

Correlation

\(\:0<\left|\rho\:\right|\le\:0.3\)

Low correlation

\(\:0.3\le\:\left|\rho\:\right|\le\:0.7\)

Moderate correlation

\(\:0.7<\left|\rho\:\right|\le\:1\)

High correlation