Top new questions this week:
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I'm looking at the amount of carbon in seven forest pools. For dead trees left on the landscape across many locations and over several harvest retention (logging) treatments, there is an extreme value ...
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Suppose I have two data samples $\mathbf{x}=(x_1,x_2,..,x_n)$ and $\mathbf{y}=(y_1,y_2,..,y_n)$, where $x_i\in\{0,1\},y_i\in\{0,1\}$, where the entries with the same index are related (e.g., come from ...
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I’m trying to understand the common assumptions in machine-learning optimization theory, where a “well-behaved” loss function is often required to be both L-Lipschitz and β-smooth (i.e., have β-...
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I am using Ordinal Semiparametric Regression (Frank Harrell's rms package) to model overall survival in patients with brain tumor. I am thinking of centering the Age covariate, because I want Age = 0 ...
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How should I handle a mass-point in the dependent variable when running OLS regression in R?
I’m working with a a household expenditure dataset (Living Costs 2019) where the dependent variable is the ...
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I am trying to understand how to obtain the confidence interval for a function fitted with scipy.optimize.least_squares. If my understanding is correct, I'd need to take the "Modified Jacobian ...
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I am designing a causal inference analysis using observational data and I am trying to determine the sensitivity of my study design given a fixed sample size.
Study Details:
Goal: Estimate the Average ...
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Greatest hits from previous weeks:
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I was wondering what the difference between the variance and the standard deviation is.
If you calculate the two values, it is clear that you get the standard deviation out of the variance, but what ...
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I recently used bootstrapping to estimate confidence intervals for a project. Someone who doesn't know much about statistics recently asked me to explain why bootstrapping works, i.e., why is it that ...
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I have a monthly average for a value and a standard deviation corresponding to that average. I am now computing the annual average as the sum of monthly averages, how can I represent the standard ...
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In particular, I am referring to the Pearson product-moment correlation coefficient.
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Are multiple and multivariate regression really different? What is a variate anyways?
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I got this question during an interview with Amazon:
50% of all people who receive a first interview receive a second interview
95% of your friends that got a second interview felt they had a good ...
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How to interpret the Null and Residual Deviance in GLM in R? Like, we say that smaller AIC is better. Is there any similar and quick interpretation for the deviances also?
Null deviance: 1146.1 on ...
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Can you answer these questions?
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This question may already have been answered elsewhere, but if so I'm having trouble relating it to what I want to do, so I'm asking it again here.
In short, my study involves asking participants to ...
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I am estimating repeatability (a type of intra-class correlation) from mixed models with negative binomial and beta distributions and want to confirm that the variance transformations to obtain ...
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I have run a second-order LCA model in Mplus.
In the %OVERALLA% , I merely changed "c1 c2 on c" to "c2 c1 on c", which caused changes in the "C Classes (Rows) by C1 Classes (...
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