\(\begin{equation} \label{eq:4} \beta=\text { Median }\left(\frac{X_j-X_l}{j-1}\right) \forall l \prec j \end{equation}\)
β represents the linear trend of the original sequence Xt, and Xi and Xj represent the original sequences of the ith item and the jth item, respectively. If the slope is nearly zero, there is no need for trend analysis. However, the trend is considered linear if it deviates from zero, and the linear trend is computed by eliminating the trend term (Tt). This results in the formation of the sequence Yt, which does not include the trend term.