N-back training Should I do multiple daily sessions, or just one? Others do one session in the morning and one in the evening so they can focus better on each one. There is some scientific support for the idea that evening sessions are better than morning sessions, though; see Kuriyama on how practice before bedtime was more effective than after waking up.
Detailed feedback about statistics in a critical review Michael McCarthy says: This paper by Amrhein et al. The example concerns a woman who is carrying twins, both male as determined by sonogram and we ignore the possibility that gender has been observed incorrectly. The parents-to-be ask Efron to tell them the probability that the twins are identical.
Read full report This paper by Amrhein et al. This is my first open review, so I'm not sure of the protocol. But given that there appears to be errors in both Efron b and the paper under review, I am sorry to say that my review might actually be longer than the article by Efron athe primary focus of the critique, and the critique itself.
I apologize in advance for this. To start, I will outline the problem being discussed for the sake of readers. This problem has various parameters of interest.
The bone of contention in the Efron papers and the critique by Amrhein et al. The paper by Amrhein et al. Apparently, the doctor knows that one third of twins are identical 2. Now, what would happen if we didn't have the doctor's knowledge? In contrast, Amrhein et al. No one is violating logic — they are merely expressing ignorance by specifying equal probabilities to all states of nature.
Whether this is philosophically valid is debatable Colyvanbut this example does not lend much weight to that question, and it is well beyond the scope of this review. Now the problem has two aspects that are uncertain.
Uncertainty in the state of x refers to uncertainty about this particular set of twins. A key point is that the state of one particular set of twins is a different parameter from the frequency of occurrence of identical twins in the population.
Alternatively, Efron b notes another alternative for an uninformative prior: Here I disagree with Amrhein et al. Although there is one data point a couple is due to be parents of twin boys, and the twins are fraternalEfron does not use it to update prior knowledge.
The data about the twin boys is not useful by itself for this purpose — they are a biased sample the data have come to light because their gender is the same; they are not a random sample of twins. Further, a sample of size one, especially if biased, is not a firm basis for inference about a population parameter.
While the data are biased, the claim by Amrheim et al. However, the data point the twins have the same gender is entirely relevant to the question about the state of this particular set of twins. And it does update the prior. This updating of the prior is given by equation 1 above.
This possible confusion between uncertainty about these twins and uncertainty about the population level frequency of identical twins is further suggested by Amrhein et al. Third, we find it at least debatable whether a prior can be called an uninformative prior if it has a fixed value of 0.
Therefore, both claims in the quote above are incorrect. It is probably easiest to show the lack of influence of the prior using MCMC sampling. However, given the biased sample size of 1, the posterior distribution for this particular parameter is likely to be misleading as an estimate of the population-level frequency of twins.
Further, Amrhein et al. The parents simply know that the twins are both male. Whether they are fraternal is unknown fraternal twins being the complement of identical twins — that is the question the parents are asking.
This error of interpretation makes the calculations in Box 1 and subsequent comments irrelevant. Box 1 also implies Amrhein et al. This is different from the aim of Efron a and the stated question.Latest environmental news, features and updates.
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As a follow-up to Tuesday’s post about the majority-minority public schools in Oslo, the following brief account reports the latest statistics on the cultural enrichment of schools in Austria.
Vienna is the most fully enriched location, and seems to be in roughly the same situation as Oslo. Many thanks to Hermes for the translation from urbanagricultureinitiative.com We hypothesized that if we increase voltage of an electrical stimulus in a frog muscle we will see an increase in stimulation amplitude and if we Fair Use Policy (Carvalho, Gomes and Navas ).
Frog locomotion is dependent on muscles, particularly skeletal muscles, which are muscles connected to the skeleton (Marsh and Olson Download-Theses Mercredi 10 juin