In this paper, a study on second order rotatable designs under tri-diagonal correlated structure of errors using a pair of balanced incomplete block designs is suggested. Further, the variance function of the estimated response for different values of tri-diagonal correlated coefficient and distance from centre for ( - factors) are studied.
Please see the link :- https://www.journalajpas.com/index.php/AJPAS/article/view/30205
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