AggregateResponse

Aggregate (per-observation) response that echoes every observation made on any chained source onto itself. The aggregate's within- and across-replication statistics are then a pooled view of every observation across every source: a source that fires twice as often contributes twice as many observations to the pool.

Parallel to AggregateTWResponse for non-time-weighted (per-event) responses. Use this when you want to compute a single mean (or any other Welford statistic) over the combined stream of observations from a set of Response sources — for example, an average fill-rate over a collection of inventories where each inventory pushes a 1.0/0.0 observation on every customer demand it sees.

Echo semantics. Each time a chained source's Response.value is assigned, this aggregate's value is assigned the same number. That assignment runs through the standard Response.assignValue path, so the aggregate's own within-replication Welford accumulator records the observation, and the aggregate's own observers (if any) fire downstream — exactly like AggregateTWResponse.

Weighting. Because every source observation produces exactly one aggregate observation, sources are weighted by their observation count. If two sources should be weighted equally regardless of how often they fire, the caller should aggregate source means externally rather than chain through this class.

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