## Warning in lapply(row_vars$states, as.integer): NAs introduced by coercion
## Warning in expand_panel(..., self = self): NAs introduced by coercion

## Warning in lapply(row_vars$states, as.integer): NAs introduced by coercion
## Warning in expand_panel(..., self = self): NAs introduced by coercion

## Warning in lapply(row_vars$states, as.integer): NAs introduced by coercion
## Warning in expand_panel(..., self = self): NAs introduced by coercion