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Professor Ioannis Kontoyiannis | Statistical Laboratory
www.statslab.cam.ac.uk/person/ik3551 Jul 2024: Between 2005 and 2021 he was with the Department of Informatics of the Athens University of Economics and Business. ... I Papageorgiou, I Kontoyiannis. (2023). (doi: 10.48550/arxiv.2308.00913). Temporally Causal Discovery Tests for Discrete Time Series -
Talks | Qingyuan Zhao
https://www.statslab.cam.ac.uk/~qz280/talk/3 Jun 2024: 2024-02-08 2:00 PM — 3:00 PM London School of Economics and Political Science (LSE). -
Publications | Qingyuan Zhao
https://www.statslab.cam.ac.uk/~qz280/publication/3 Jun 2024: Falsification tests for instrumental variable designs with an application to tendency to operate. ... Journal of Business & Economic Statistics (2019). Charles Zheng, Trevor Hastie, Robert Tibshirani (2016). -
Mendelian randomization
www.statslab.cam.ac.uk/~qz280/talk/mr-tutorial/slides.pdf3 Jun 2024: 7/40. IV in Economics: Effect of military service on earnings2. Lottery number Z Military service X Earning Y. ... administrative records. American Economic Review, 80(3), 313–336. 8/40. Results of the Vietnam-war lottery study. -
STATISTICAL MODELLING Part IIC, Michaelmas 2021 Practical 8:…
www.statslab.cam.ac.uk/~qz280/teaching/modelling-2022/P8.pdf3 Jun 2024: mod2 <- glm(Freq subject_msubject_f match, data=SD_subj, family=poisson). > anova(mod1, mod2, test="LR"). ... Therefore we can calculate the approximate p-value for the test above with. > -
Causal Inference: An Introduction Qingyuan Zhao Statistical…
www.statslab.cam.ac.uk/~qz280/talk/ssrmp-2020/slides.pdf3 Jun 2024: Examples in social sciences. 1 Economics: How does supply and demand (causally) depend on price? ... Statistical inference: Approach 1. Randomisation inference (permutation test). Test the hypothesis H0 : A Y | X (or H0 : A Y if randomisation does -
Sensitivity analysis for observational studies: Past, Present, and…
www.statslab.cam.ac.uk/~qz280/talk/uea-2024/slides.pdf3 Jun 2024: Solid curves: contours of likelihood ratio test. Dashed curves:. estimated ATE reduced by half. ... Blattman, Christopher and Jeannie Annan (2010). “The Consequences of ChildSoldiering”. In: The Review of Economics and Statistics 92.4, pp. -
Causal Inference
www.statslab.cam.ac.uk/~qz280/teaching/causal-2023/slides.pdf3 Jun 2024: Randomization inference: General tests. Randomization provides the “reasoned basis” for Fisher’s exact test. ... Randomization inference: F-test. Setting: Neyman-Rubin model, A = {0,1,. ,k 1}. -
Will competition-winning methods for causal inference also succeed in …
www.statslab.cam.ac.uk/~qz280/publication/acic-competition-comment/paper.pdf3 Jun 2024: REFERENCES. Angrist, J. D. and Krueger, A. B. (1999). Empirical strategies in labor economics. ... TheAmerican Economic Review Papers and Proceedings 93 126-132. Keele, L. and Small, D. -
Sensitivity analysis for observational studies: Looking back and…
www.statslab.cam.ac.uk/~qz280/talk/yale-biostats-2020-2/slides.pdf3 Jun 2024: The Reviewof Economics and Statistics, 92(4):882–898, 2010. doi:10.1162/REST a 00036. C. ... Biometrics, 69:803–811, 2013. G. W. Imbens. Sensitivity to exogeneity assumptions in program evaluation.American Economic Review, 93:126–132, 2003. -
Confounder adjustment in large-scale linear structural models
www.statslab.cam.ac.uk/~qz280/publication/cate-mutual-fund/slides.pdf3 Jun 2024: I In R, run summary(lm(YX)).I Equivalent to a two-sample t-test with equal variance. ... Journal of Financial Economics, 33(1).7. Carhart, M. M. (1997). “On persistence in mutual fund performance.” Journal of Finance, 52(1). -
CAUSAL INTERPRETATIONS OF BLACK-BOX MODELS QINGYUAN ZHAO AND TREVOR…
www.statslab.cam.ac.uk/~qz280/publication/pdp/paper.pdf3 Jun 2024: ICE is first introduced to discover. interaction between the predictor variables and visually test if the function g is additive. ... Journal of Economic Perspectives, 31(2):87–106, 2017. Judea Pearl. Comment: Graphical models, causality and -
Two-Sample Instrumental Variable Analysis: Challenges and Some…
www.statslab.cam.ac.uk/~qz280/publication/two-sample-iv/slides.pdf3 Jun 2024: Future work: Goodness-of-fit test of the statistical model. Good statistical fit more confidence in the results? ... TheReview of Economics and Statistics, 92(3):557–561, 2010. M. Katan. Apoupoprotein e isoforms, serum cholesterol, and cancer. -
Lecture Notes on Causal Inference(with corrections) Qingyuan Zhao May …
www.statslab.cam.ac.uk/~qz280/teaching/causal-2023/notes-2021.pdf3 Jun 2024: The first approachtries to test the conditional independence A[n] Y[n](0) | X. ... A level-α randomisation test then rejects H0 if Pm α. 2.19 Theorem. Results that match 1 of 2 words
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What is a randomization test? | Qingyuan Zhao
https://www.statslab.cam.ac.uk/~qz280/talk/toronto-2022/3 Jun 2024: Search. What is a randomization test? Date. 2022-03-23 2:00 PM — 3:00 PM. -
Multiple conditional randomization tests | Qingyuan Zhao
https://www.statslab.cam.ac.uk/~qz280/publication/multiple-crts/3 Jun 2024: April 2021Abstract. We propose a general framework for (multiple) conditional randomization tests that incorporate several important ideas in the recent literature. ... We show that under a change of perspective, many existing statistical methods, -
www.statslab.cam.ac.uk/~qz280/talk/index.xml
www.statslab.cam.ac.uk/~qz280/talk/index.xml3 Jun 2024: talk/ccaim-summer-school-2022/ Multiple conditional randomization tests https://www.statslab.cam.ac.uk/qz280/talk/mcp-2022/ Wed, 31 Aug 2022 13:45:00 0000 ... ac.uk/qz280/talk/mcp-2022/ Multiple conditional randomization tests -
Testimonials from Our Clients | The Statistics Clinic
www.statslab.cam.ac.uk/clinic/testimonials.html1 Jul 2024: Heather, Department of Economics). Thank you, what a great free service for us "lost" biologists to be able to more accurately understand our data and hopefully avoid wrong interpretations. -
Dr Qingyuan Zhao | Statistical Laboratory
www.statslab.cam.ac.uk/person/qz2801 Jul 2024: FR Guo, Q Zhao. (2023). (link to publication). What is a Randomization Test? -
Publications | Statistical Laboratory
www.statslab.cam.ac.uk/publications?page=11 Jul 2024: 2024). 405,. 74. (doi: 10.1007/s00220-024-04960-5). Temporally Causal Discovery Tests for Discrete Time Series and Neural Spike Trains. -
What is a randomization test? | Qingyuan Zhao
https://www.statslab.cam.ac.uk/~qz280/publication/single-crt/3 Jun 2024: A new term—‘quasi-randomization test’—is introduced to define significance tests based on theoretical models and distinguish these tests from the ‘randomization tests’ based on the physical act of randomization. ... The proposed terminology -
Multiple conditional randomization tests | Qingyuan Zhao
https://www.statslab.cam.ac.uk/~qz280/talk/ims-2022/3 Jun 2024: Search. Multiple conditional randomization tests. Date. 2022-06-27 5:10 PM — 5:30 PM. -
Multiple conditional randomization tests | Qingyuan Zhao
https://www.statslab.cam.ac.uk/~qz280/talk/mcp-2022/3 Jun 2024: Search. Multiple conditional randomization tests. Date. 2022-08-31 1:45 PM — 2:15 PM. -
Multiple conditional randomization tests
www.statslab.cam.ac.uk/~qz280/talk/berkeley-2021/slides.pdf3 Jun 2024: Slides: http://statslab.cam.ac.uk/qz280/. The role of randomization tests became obscure. Fisher (1935): To substitute t-test when normality is not true and to restore randomization as “thephysical ... Conditional randomization tests for discrete -
Discussion on (quasi-)randomization inference | Qingyuan Zhao
https://www.statslab.cam.ac.uk/~qz280/post/randomization-hyunseung/3 Jun 2024: I personally think the Freedman and Lane’s example with “randomizing” gender makes the distinction between the classic randomization test and your quasi-randomization tests more clear than the example you ... Personally, I would define -
Rachel Kelz | Qingyuan Zhao
https://www.statslab.cam.ac.uk/~qz280/author/rachel-kelz/3 Jun 2024: Falsification tests for instrumental variable designs with an application to tendency to operate. -
Sensitivity Analysis | Qingyuan Zhao
https://www.statslab.cam.ac.uk/~qz280/tag/sensitivity-analysis/3 Jun 2024: It only tests the sharp null hypothesis; 3. It assumes treatment effect homogeneity to obtain a confidence interval of …. 2024. Powered by the Academic theme forCite. -
Selective Randomization Inference for Adaptive Experiments | Qingyuan …
https://www.statslab.cam.ac.uk/~qz280/publication/selective-randomization/3 Jun 2024: In a nutshell, our approach applies conditional post-selection inference to randomization tests. ... Lastly, we demonstrate our method and compare it with other randomization tests using synthetic and real-world data. -
Selective Inference | Qingyuan Zhao
https://www.statslab.cam.ac.uk/~qz280/tag/selective-inference/3 Jun 2024: We apply ideas from post-selection inference to randomization tests for adaptive experiments. -
On testing mean proportionality of multivariate normal variables |…
https://www.statslab.cam.ac.uk/~qz280/publication/proportionality-testing/3 Jun 2024: We show that the usual likelihood ratio χ2-test is valid non-asymptotically. ... Our proof relies on expressing the test statistic as the minimum eigenvalue of a Wishart variable and using a representation of its distribution using Legendre polynomials. -
www.statslab.cam.ac.uk/~qz280/publication/index.xml
www.statslab.cam.ac.uk/~qz280/publication/index.xml3 Jun 2024: qz280/publication/pathgps/ Wed, 04 May 2022 00:00:00 0000 https://www.statslab.cam.ac.uk/qz280/publication/pathgps/ What is a randomization test? ... 21 Jul 2021 00:00:00 0000 https://www.statslab.cam.ac.uk/qz280/publication/fda-comment-2021/ Multiple -
How the Clinic Works | The Statistics Clinic
www.statslab.cam.ac.uk/clinic/service.html1 Jul 2024: Research. Show our clients novel, cutting edge methods that may be used to understand data better, make more precise predictions and test hypotheses more reliably. -
Dr Qingyuan Zhao | The Statistics Clinic
www.statslab.cam.ac.uk/clinic/person/qz2801 Jul 2024: 2023). (link to publication). What is a Randomization Test? Y Zhang, Q Zhao. – -
Group Members
www.statslab.cam.ac.uk/~rjs57/Group.html18 Jun 2024: Yining Chen (Assistant Professor then Associate Professor, Department of Statistics, London School of Economics and Political Science). ... Tengyao Wang (Lecturer, Department of Statistical Science, University College London; Associate Professor, London -
Practical: Randomization inference
www.statslab.cam.ac.uk/~qz280/teaching/siscer-2023/P1.pdf3 Jun 2024: Here are some points you mayconsider. • How do the two randomization tests compare with each other? ... Why?• How can you "invert" the randomization tests to obtain an interval estimator of the treatment. -
CAUSAL INFERENCE Part III / Michaelmas 2023Example Sheet 1 ...
www.statslab.cam.ac.uk/~qz280/teaching/causal-2023/E1.pdf3 Jun 2024: Compare this with Fisher’s exact test in the randomization model discussedin lectures. ... i. This test should compare T with quantilesof the standard normal distribution after scaling. -
Confounder Adjustment in Multiple Hypothesis Testing
www.statslab.cam.ac.uk/~qz280/publication/cate/slides.pdf3 Jun 2024: Model andInference. Model andIdentifiability. Estimation. Hypothesis Tests. NumericalExamples. Summary. 12/49. Association test. ... Estimation. Hypothesis Tests. NumericalExamples. Summary. 38/49. Significance test for confounding. Theorem (Wang, Z., -
SISCER Module 12 Lecture 4: Matched Case-Control Studies
www.statslab.cam.ac.uk/~qz280/teaching/siscer-2023/L4.pdf3 Jun 2024: I Mantel–Haenszel test. I Logistic regression adjusting for treatment, stratum indicators (and potentiallyother covariates). ... multiple 22 tablesI Consider sensitivity analysis for Fisher’s exact test in one 22 table. -
Multiple conditional randomization tests | Qingyuan Zhao
https://www.statslab.cam.ac.uk/~qz280/talk/berkeley-2021/3 Jun 2024: Search. Multiple conditional randomization tests. Date. 2021-09-29 9:30 PM — 10:30 PM. -
STATISTICAL MODELLING Part IIC, Michaelmas 2019Practical 1:…
www.statslab.cam.ac.uk/~qz280/teaching/modelling-2022/P1S.pdf3 Jun 2024: examinable) tells us is a valid approximationto the exact distribution of the test statistic under the null. ... the (approximate) p-value for thetwo-sided test statistic. This is known as a permutation or exact test, and you can read a briefdescription -
STATISTICAL MODELLING Part IIC, Michaelmas 2019Practical 6: Binomial…
www.statslab.cam.ac.uk/~qz280/teaching/modelling-2022/P6S.pdf3 Jun 2024: This test cannot reject the simpler model without interactions between mumMyopic and dadMyopic. ... To test the hypothesis thatthe effects are equal, we can use the z-test for this coefficient.mumPlusdadMyopic <- (dadMyopic == "Yes") (mumMyopic == -
STATISTICAL MODELLING Part IIC, Michaelmas 2021Practical 6: Binomial…
www.statslab.cam.ac.uk/~qz280/teaching/modelling-2022/P6.pdf3 Jun 2024: 2 609 439.60 8 40.478 2.61e-06. In contrast to the lm case, here we need to specify that we want to perform a likelihood ratio test (test= ... To formally test this hypothesis, we should createa variable. > mumPlusdadMyopic <- (dadMyopic == "Yes") -
SISCER Module 15 Practice 3: DID
www.statslab.cam.ac.uk/~qz280/teaching/siscer-2023/S4.pdf3 Jun 2024: Estimate Std. Error t value Pr(>|t|)## -0.036548937 0.012646474 -2.890049673 0.003893424# cluster-robust standard error with CR2 small-sample correctioncoeftest.twfe <- coef_test(fit.twfe,. ... 2. mod <- lm(form, data = df). # using arguments from here:# -
Falsification tests for instrumental variable designs with an…
https://www.statslab.cam.ac.uk/~qz280/publication/iv-falsification/3 Jun 2024: Search. Falsification tests for instrumental variable designs with an application to tendency to operate. ... We demonstrate this test using an IV known as tendency to operate (TTO) from health services research. -
SISCER Module 12 Lecture 5: Instrumental variables
www.statslab.cam.ac.uk/~qz280/teaching/siscer-2023/L5.pdf3 Jun 2024: IV in Economics: Effect of military service on earnings (Angrist, 1990). ... American Economic Review, 80(3):313–336. Gamazon, E. R., , Wheeler, H. E., Shah, K. -
Sensitivity analysis via stochastic programming
www.statslab.cam.ac.uk/~qz280/talk/icsds-2023/slides.pdf3 Jun 2024: Blattman, Christopher and Jeannie Annan (2010). “The Consequences of ChildSoldiering”. In: The Review of Economics and Statistics 92.4, pp. ... In:American Economic Review 93, pp. 126–132. Saltelli, Andrea et al. (2004). -
STATISTICAL MODELLING Part IIC, Michaelmas 2021Practical 5: ANOVA and …
www.statslab.cam.ac.uk/~qz280/teaching/modelling-2022/P5.pdf3 Jun 2024: interaction.plot(Photo, Quality, fitted.values(EssayMarksLM2)). > interaction.plot(Quality, Photo, fitted.values(EssayMarksLM2)). To test for the presence of interactions, we again use an F-test:. > ... Would it be possible to com-pare the models -
Simultaneous Hypothesis Testing using Internal Negative Controls…
www.statslab.cam.ac.uk/~qz280/publication/ranc/slides.pdf3 Jun 2024: Den. sity. Protein under investigation negative control. (a) P-values from a two-sample “t-test”. ... Enabled by validity PRDS. Global/intersection null: Simes’ test;. FWER: Hochberg-Hommel procedure (closure of Simes’ test);. -
Cross-screening in observational studies that test many hypotheses |…
https://www.statslab.cam.ac.uk/~qz280/publication/cross-screening/3 Jun 2024: Search. Cross-screening in observational studies that test many hypotheses. -
STATISTICAL MODELLING Part IIC, Michaelmas 2021Practical 4: More on…
www.statslab.cam.ac.uk/~qz280/teaching/modelling-2022/P4.pdf3 Jun 2024: If the goal is to test the significanceof some coefficients, post model-selection inference is needed to control statistical errors. ... Note that we supplied the models in order of nestedness, and so the anova functionperforms F-tests between adjacent
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