data(McCammonVanDyke)
reduce(McCammonVanDyke,"coalition",
c("ideology","threats","opportunity","ties","resources"),
cdontcare='negative')
## result in figure 13.2
reduce(McCammonVanDyke,"coalition",
c("ideology","threats","opportunity","ties","resources"),
cdontcare='remainder')
## result in figure 13.3
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