Top new questions this week:
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If we have an underpowered study but manage to reject the null hypothesis, anyway, it makes sense to wonder if we have overestimated the effect size. However, such a concern seems unwarranted if we …
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I was looking for the difference between spline regression and piecewise regression. Can someone please explain it to me? Also, if someone can provide me good reference on these 2 topics, with …
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I was solving an exercise for a probability theory course and stumbled upon the following problem. Given a continuous random variable $X$, and $\max(a,b) = a$ if $a > b$ and $b$ otherwise, is $$ E[\…
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As I understand it the p-value for some hypothesis H and some test-statistic T is defined as the probability of observing a test-statistic T’ which is at least as extreme as T, conditional on H being …
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So, I understand that for two vectors of numbers X and Y the mean of X/Y is different from the mean of X divided by the mean of Y. But I’m not sure when it is appropriate to use each. Specifically, I …
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I have a super simple chi-square in R question, but I’m struggling to wrap my head around it. The question was to take a random 20 people from the dataset, count males and females and then use chi-…
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Regarding boosting in the context of machine learning. One definition I have encountered talks about turning multiple weak learners into one strong learner, and another talks about starting with a …
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Greatest hits from previous weeks:
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I found two questions here and here about this issue but there is no obvious answer or explanation yet.I enforce the same problem where the validation error is less than training error in my …
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How should one understand the keys, queries, and values that are often mentioned in attention mechanisms? I’ve tried searching online, but all the resources I find only speak of them as if the reader …
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What is the difference between data mining, statistics, machine learning and AI? Would it be accurate to say that they are 4 fields attempting to solve very similar problems but with different …
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In a standard normal distribution how do I deal with a $Z$ value greater than 3? I know that z-score ranges form -3 to 3 Consider this one … mean = 70, standard deviation = 4 I need to …
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I’m using Python Keras package for neural network. This is the link. Is batch_size equals to number of test samples? From …
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Say I have some historical data e.g., past stock prices, airline ticket price fluctuations, past financial data of the company… Now someone (or some formula) comes along and says “let’s take/use …
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I’m currently working on a quasi-experimental research paper. I only have a sample size of 15 due to low population within the chosen area and that only 15 fit my criteria. Is 15 the minimum sample …
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Can you answer these questions?
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I have a dataset that has a categorical factor and numerical response variables as proportions. A simplified deput() included at the end of the body. But, here is …
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Outcome #1 Outcome #2 Source #1 a b Source #2 c d Let p1 denote proportion of outcome #1 for source #1, p2 denote proportion of outcome #1 for source #2. I’m trying to calculate P(odds(p1)>odds(…
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Good morning, I have two groups of participants, and the same variable, measured in three different moments (categorical data- non-parametric test, between groups). I would like to know which test …
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