ally when the number of studies, <em></em>\(k\), is low. Therefore, it is highly recommended to use the method by Hartung (1999), Sidik and Jonkman (2002), and Knapp and Hartung (2003) (the Knapp-Hartung method; also referred to as the Hartung-Knapp-Sidik-Jonkman method) by setting <code>test="knha"</code> (or equivalently, <code>test="hksj"</code>). Then tests of individual coefficients and confidence intervals are based on a t-distribution with <em></em>\(k-p\) degrees of freedom, while the omnibus test t