Robustness of Nested Balanced Incomplete Block Designs Against Missing Data

Robustness aspects of nested balanced incomplete block designs against missing data have been investigated using connectedness and efficiency criteria. Sufficient condition for robustness of a design has been obtained for the loss of any m observations, using connectedness criterion. Designs robust against the loss of any m observations belonging to one sub-block, loss of any two observations belong to two different sub-blocks in a block or in different blocks and loss of any t observations in a block have been identified.