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Source: Statistics Blog

Source: Statistics Blog

Ken Cor and Gaurav Sood write: Many claims in a scientific article rest on research done by others. But when the claims are based on flawed research, scientific articles potentially spread misinformation. To shed light on how often scientists base their claims on problematic research, we exploit data on cases where problems with research are […]
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The post Endless citations to already-retracted articles appeared first on StatsBlogs. [...]

Mon, Jul 15, 2019Source: Statistics Blog

As I was attending Lionel Riou-Durand’s PhD thesis defence in ENSAE-CREST last week, I had a look at his papers (!). The 2018 noice contrastive paper is written with Nicolas Chopin (both authors share the CREST affiliation with me). Which compares Charlie Geyer’s 1994 bypassing the intractable normalising constant problem by virtue of an artificial […]
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The post noise contrastive estimation appeared first on StatsBlogs. [...]

Sun, Jul 14, 2019Source: Statistics Blog

As I was attending Lionel Riou-Durand’s PhD thesis defence in ENSAE-CREST last week, I had a look at his papers (!). The 2018 noice contrastive paper is written with Nicolas Chopin (both authors share the CREST affiliation with me). Which compares Charlie Geyer’s 1994 bypassing the intractable normalising constant problem by virtue of an artificial logit model with additional simulated data from another distribution ψ.
“Geyer (1994) established the asymptotic properties of the MC-MLE estimates under general conditions; in particular that the x’s are realisations of an ergodic process. This is remarkable, given that most of the theory on M-estimation (i.e.estimation [...]

Sun, Jul 14, 2019Source: Xian Blog

The discriminant of a quadratic equation ax + bx + c = 0 is Δ = b – 4ac. If the discriminant Δ is zero, the equation has a double root, i.e. there is a unique x that makes the equation zero, and it counts twice as a root. If the discriminant is not zero, […]
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The post Discriminant of a cubic appeared first on StatsBlogs. [...]

Sun, Jul 14, 2019Source: Statistics Blog

While reading Dr.Nina Zumel’s excellent note on bias in common ensemble methods, I ran the examples to see the effects she described (and I think it is very important that she is establishing the issue, prior to discussing mitigation). In doing that I ran into one more avoidable but strange issue in using xgboost: when … Some Details on Running xgboost
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The post Some Details on Running xgboost appeared first on StatsBlogs. [...]

Sun, Jul 14, 2019Source: Statistics Blog

Gerd Gigerenzer writes: Behavioral economics began with the intention of eliminating the psychological blind spot in rational choice theory and ended up portraying psychology as the study of irrationality. In its portrayal, people have systematic cognitive biases that are not only as persistent as visual illusions but also costly in real life—meaning that governmental paternalism […]
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The post Gigerenzer: “The Bias Bias in Behavioral Economics,” including discussion of political implications appeared first on StatsBlogs. [...]

Sun, Jul 14, 2019Source: Statistics Blog