Statistical Methods For Mineral Engineers -

$$ R(t) = R_{max} \cdot \frac{t^n}{K^n + t^n} $$

$$ \gamma(h) = \frac{1}{2N(h)} \sum_{i=1}^{N(h)} [Z(x_i) - Z(x_i + h)]^2 $$ Statistical Methods For Mineral Engineers

If $X$ is the vector of measured variables and $V$ is the variance-covariance matrix of measurements, we find the adjusted values $\hat{X}$ that minimize: $$ R(t) = R_{max} \cdot \frac{t^n}{K^n + t^n}