Correlations among exposure-mapping regressors make OLS spillover coefficients weighted sums of heterogeneous effects plus contamination terms, and sampled networks can create such correlations even when the population estimand is clean.
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Design-Based and Network Sampling-Based Uncertainties in Network Experiments
Correlations among exposure-mapping regressors make OLS spillover coefficients weighted sums of heterogeneous effects plus contamination terms, and sampled networks can create such correlations even when the population estimand is clean.