Questions tagged [sample]

a sequence of objects or individuals collected from a larger (possibly infinite) population or process.

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What are the first four moments of a linear function of IID random variables?

Consider a sequence of IID random variables $X_1,X_2,X_3,...$ from a common distribution with mean $\mu$, variance $\sigma^2$, skewness $\gamma$ and kurtosis $\kappa$ (all finite). Given a sequence ...
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Calculating sample size for stratified sampling

I have an issue with determining sample sizes for a collection of strata. It regards comparing shares of a binary variable. I'm supposed to find the sample sizes for each strata using both ...
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Psychometric test validation question

We are trying to validate a test for young children using IRT analyses (rasch/2pl). Models do not converge due to a floor effect. Teachers also took this assessment. Would it skew results if i ...
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Finding the most equidistributed sample of a function's domain and the average of $f$ mapped on the sample?

Apologies if the notations aren't familiar. I don't have a statistics background and I hope that readers have a basic understanding of pure mathematics. ** Edit**: I want to find the sample of ...