Answers are grounded in this paper and cite their sources.
"Regression Diagnostics — Identifying Influential Data and Sources of Collinearity." Journal of the Operational Research Society, 32(2), pp. 157–158
No takes yet. Share an insight, caveat, or question.
Chris Beaumont (1981) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: