পদ্ধতির তুলনা করুন

	স্থানিক প্লেসবো পরীক্ষা	স্পেশাল রিগ্রেশন ডিসকন্টিনিউটি ডিজাইন (Spatial RDD)
ক্ষেত্র	কার্যকারণ অনুমান	কার্যকারণ অনুমান
পরিবার	Regression model	Regression model
উদ্ভবের বছর	2000s–2010s	2010s
প্রবর্তক	Developed organically in spatial econometrics and geographic RDD literature; prominent use in Dell (2010) and related work	Popularized by Dell (2010); formalized for geographic boundaries by Keele & Titiunik (2015)
ধরন	Falsification / robustness check	Quasi-experimental causal inference
মৌলিক উৎস	Buonanno, P., Montolio, D., & Vanin, P. (2009). Does Social Capital Reduce Crime? Journal of Law and Economics, 52(1), 145-170.	Dell, M. (2010). The Persistent Effects of Peru's Mining Mita. Econometrica, 78(6), 1863-1903.
অপর নাম	geographic placebo test, spatial falsification test, spatial robustness check, geographic spillover test	Spatial RDD, Geographic RDD, Border RD Design, Geographic Discontinuity Design
সম্পর্কিত	4	4
সারসংক্ষেপ	A spatial placebo test is a falsification check used in geographic or spatial causal-inference studies. The analyst applies the same estimation procedure to spatial units, boundaries, or zones where no treatment effect should exist — fake borders, shifted cutoffs, or buffer areas beyond spillover range — and checks whether a spurious effect emerges. A non-significant result in the placebo region supports the credibility of the main causal estimate.	Spatial Regression Discontinuity Design uses a geographic or administrative boundary as the threshold that assigns units to treatment. Observations just inside one side of the boundary are compared with those just outside it, exploiting the near-random variation in treatment status near the cutoff to recover a local causal effect. The approach is widely used in economics, political science, and public health when policies or institutions change sharply at a border.