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Fraction of neighboring US states with a policy
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| library("splm") | |
| data("usaww") | |
| ?usaww | |
| # Only Alabama has this policy | |
| policy_x <- c(1, rep(0, 47)) | |
| names(policy_x) <- rownames(usaww) | |
| head(policy_x) | |
| # Fraction of neighboring states with policy x | |
| usaww %*% policy_x |
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