## VARSELECTION

Description Branch and Bound: This determines the formula used to calculate the estimate of each integer variable, and thus which integer variable is selected to be branched on at a given node. The variable selected to be branched on is the one with the maximum estimate. Type Integer Values

-1 Determined automatically. 1 The minimum of the 'up' and 'down' pseudo costs. 2 The 'up' pseudo cost plus the 'down' pseudo cost. 3 The maximum of the 'up' and 'down' pseudo costs, plus twice the minimum of the 'up' and 'down' pseudo costs. 4 The maximum of the 'up' and 'down' pseudo costs. 5 The 'down' pseudo cost. 6 The 'up' pseudo cost. 7 A weighted combination of the 'up' and 'down' pseudo costs, where the weights depend on how fractional the variable is. 8 The product of the 'up' and 'down' pseudo costs. Default value -1 Affects routines

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