indirect_effect: Retreive Indirect Effect estimates
In inferference: Methods for Causal Inference with Interference

Retrieves the population average indirect causal effect for specified allocations: Yhat(0, alpha1) - Yhat(0, alpha2). This is the effect due to the coverage (allocation) levels.

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indirect_effect(object, allocation1, allocation2 = NULL, trt.lvl = 0)

ie(object, allocation1, allocation2 = NULL, trt.lvl = 0)

`object`	an object of class `interference`
`allocation1`	the allocation scheme for which to estimate indirect effects
`allocation2`	the allocation scheme for which to estimate indirect effects. If NULL, then returns all indirect effects compared to allocation1.
`trt.lvl`	Defaults to 0.