Top new questions this week:
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Suppose I have two sets of three numbers: $x_1, x_2, x_3$ and $y_1, y_2, y_3$ and I want to test the Null hypothesis that they are drawn from the same distribution using the Wilcoxon-Mann-Whitney test….
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As the title suggests, what is it about the nature of GAMs that make them so popular in ecology? Is it their ability to model latent variables? If so, why wouldn’t they be more universally popular, …
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I read an article published in 2020 which claimed that the South Korean population had declined “for the first time”, the number of deaths (~300,000) outpacing births (~275,000). However, …
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I trained a logistic regression model with two binary variables $x_1$ and $x_2$ where my target binary variable is $y$: $$\log\left(\frac{p}{1-p}\right) =\beta_0+\beta_1x_1+\beta_2x_2$$ Looking at p-…
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If a regression has 100 observations and 100 variables and none of them are collinear, what is the r squared? I know that it means that the full rank assumption is satisfied, so does this mean the r …
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Sex DiabetesNOTPresent DiabetesYESPresent Female 50 55 Male 124 70 So I have this chi-squared test that I performed. My result was statistically significant. The data relates to heart failure in …
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I want to perform a competing risks regression analysis. There are 3 competing risks + censored data. I would like to know if there is a way to calculate the minimal observations I will need per event …
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Greatest hits from previous weeks:
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The waiting times for poisson distribution is an exponential distribution with parameter lambda. But I don’t understand it. Poisson models the number of arrivals per unit of time for example. How is …
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In some literature, I have read that a regression with multiple explanatory variables, if in different units, needed to be standardized. (Standardizing consists in subtracting the mean and dividing …
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In linear regression, we often get multiple R and R squared. What are the differences between them?
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In a group of students, there are 2 out of 18 that are left-handed. Find the posterior distribution of left-handed students in the population assuming uninformative prior. Summarize the results. …
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I found this confusing when I use the neural network toolbox in Matlab. It divided the raw data set into three parts: training set validation set test set I notice in many training or learning …
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What are principal component scores (PC scores, PCA scores)?
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Well, we’ve got favourite statistics quotes. What about statistics jokes?
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Can you answer these questions?
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Suppose the functions $f_1\sim\mathcal{GP}(m_1,K_1)$ and $f_2\sim\mathcal{GP}(m_2,K_2)$ are drawn from independent Gaussian Processes, and let $$f=f_1+f_2.$$ Then $$f\sim\mathcal{GP}(m,K)$$ where $m=…
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For context, I am a beginner and this is my first time attempting to implement a machine-learning algorithm. This is for school. I am attempting to predict whether a 100-meter dash athlete wins a …
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I have a dataset starting from 2015 to the current time. There is no complexity of “delayed entry”. Now whenever a person subscribe to my company, they are instantly enrolled into my dataset….
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