Abstract
A method of constructing a class of block designs known as C-designs has been suggested and it has been shown that this method can conveniently be used to obtain a series of imcomplete block designs (IBDs) for multiple symmetrical parallel line (MSPL) assays. Using two particular classes of C-designs as basic designs, two different series of IBDs for MSPL assays have been evolved. It has been further shown that the series of IBDs for symmetrical parallel line (SPL) assays can also be derived as a particular case from all these IBDs for MSPL assays. Besides, the analyses of all these bio-assay designs have been provided in general terms.
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