Questions tagged [population]
A population is the entire set of units from which a sample may be drawn.
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What is the statistics term for overlapping populations
Given this image from another question:
I have two populations, from which some software has given me the x̄ and s. I want to quantify the overlap, preferably with an equation or formula that can be ...
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How can the standard error measure how accurately a sample represents the population, when we don’t have access to the population’s data?
If I got it correct, the standard error is a statistic that measures the variability of a sample’s data and how accurately a statistic represents the corresponding parameter.
Please suggest any ...
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Matching Strategy
I am seeking to compare two populations - one exposed to a drug after surgery and the other not exposed to the drug after surgery - controlling for a series of health related factors. The "...
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Comparing a population odds ratio to a sample odds ratio
Is it possible to compare and quantify the accuracy of a population odds ratio to a sample odds ratio?
I have survey data that is sampled (stratified sampling by race and ethnicity categories) from ...
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Request for reference: How do they estimate the proportion of identical and fraternal twins in the population?
In this blog post about teaching calculus, Andrew Gelman makes a slight digression about another subject, namely about him using the example of "How do they estimate the proportion of identical ...
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How to evaluate population/abundance trends using citizen science derived data?
I currently have access to some standardised survey data from Birdlife Australia, which provides counts of specific bird species (see more info on context of the data here https://birdata.birdlife.org....
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Estimate the number of affected individuals (medical problem)
My problem can be framed in medical terms. A country with population N has C individuals with a specific condition. However, this condition is underdiagnosed, and the objective is to estimate the ...
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Calculating population estimators when number of units sampled in a stratum is $\leq$ 1
A survey of 100 houses across 20 states in a country is conducted with each state being used as a stratum. To find the population mean I know i need to use the formula
$$\bar{y}_{str}=\sum^{20}_{h=1} \...
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Why is the second assumption (i.e., known population variance) unrealistic when calculating Z-interval for a mean?
I'm learning the calculation of confidence interval about the mean by Z-interval. The lecture said that:
... the second assumption about the population variance being known is
unrealistic. After all, ...
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hypothesis testing short term data against long term population with much higher standard deviation - a.k.a. how to test apples v. oranges
Actual question, in as general terms as possible
Suppose that I have a Gaussian superpopulation of known mean and standard deviation. Suppose that I know that this superpopulation is actually a ...
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Weighting imbalanced sample to reflect population distribution
I have a population (pop) with some characteristics (V1 ~ region, V2 ~ occupation type), all predictors are categorical. I have another dataset which includes only a part of population ~ 50% with an ...
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What scale do I need to consider when calculating a body condition index?
I'm trying to calculate a body condition index (scaled mass index [SMI]; Peig and Green 2009) for groups of frogs and I'm having trouble understanding what scale I need to consider when calculating a ...
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Probability of having the same Name and DOB
I have a population of 40,000,000 who might call my company. They can provide first name, last name and DOB.
I am assuming that 1.9% of people in the population have the same first name, last name and ...
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What is the interpretation of outlier-robust principal component analysis?
There's a set of methods called "robust" principal component analysis (here, "robust" means resistant to influence from outliers). One example is Hubert et al., "ROBPCA: A new ...
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What is the meaning of confidence intervals when NOT using sample data and instead have data on the whole population? [duplicate]
I'm trying to understand why you would need confidence intervals or compute statistical tests (for comparing proportions) when your data is NOT from a sample and you have data on the whole population.
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