# Questions tagged [population]

A population is the entire set of units from which a sample may be drawn.

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### question of a Poisson random effect model

Assume a Poisson random effect model (with a random intercept) $$\log E(Y_{it}|b_i,x_i)=\beta_0+\beta_1x_i+b_i$$ $$b_i \sim N(0,\tau^2)$$ How to derive the population-averaged effect of one unit ...
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### When I have population data do I need probability and can I infere? [duplicate]

Say I have data about a population and I want to analyze them, then in my understanding the "sample" is the population. And then do I need probability, like p-values, confident intervalls ...
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I'm working on measuring the usage patterns of an app for a population of users. I want to find out if they usually log in at the same hours or if their usage times vary a lot. The variance of the ...
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### Combining results of 2 survey sources

In my study, I have data from 2 survey sources (from 2 groups of people). They are very different from each others. A few major differences: First group did not get paid to answer the survey while ...
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### Another question on population vs. sample

The problem that bugs me can be boiled down to: "What is population? (Really)." This is my thought experiment I've dealing with for a few days. There is a researcher A, who gathers data from ...
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### How to compare trend of two different datasets?

I have two different datasets (ID 1 and 2) which show the number of animals per hectare for each year. I need to know if the trend for the first periode is different then the trend for the second ...
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### Analysing PSI for much smaller sample size

I would like to analyse if data of my customers have changed recently, hence wanna check Population Stability Index. However, number of my customers have decreased recently, hence number of samples ...
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### Sample Bias in Study

I have following Study statement: A council wishes to study the digital awareness of its resident senior population (over 65 years), so it questioned in person 50 residents randomly chosen from a ...
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### What actually is Population of Data?

I have just started my statistics journey and as part of assignment I was given one statement and had to deduce population, sample etc from it. The statement is as follows: A council wishes to study ...
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### Effect size calculation?

We are currently analyzing medical records data. During the study period, we have a minimum of 60,000 population patients in group ...
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### Does it make sense to have error bars if there is no uncertainty in calculating the percentage?

I know a couple questions have been asked on this site that are similar, but they were slightly different from mine, and the answers don't seem to apply to me directly. I have the following simple ...
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### What sort of statistical test should I use to determine significance between independent groups in my (kind of unprecedented and strange) study?

I have designed a study where I am collecting price data from a particular niche of businesses in my state. Some of these businesses are owned by a conglomerate, and others are not. I want to know ...
1 vote
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### Do I know the population or just a sample?

I have to analyze an artifact (a pencil), more specifically I need to analyze the production of the last semester of 2021 (during 2022 the artifact is still being produced but in my analysis I'm not ...
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### non-parametric inference assumption

This may be somewhat of a philosophical or foundational question. In parametric inference, we make a distribution assumption to relate sample to population. Even in a non-parametric technique such ...
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### What's population, what's sample, in a website conversion hypothesis test?

Context I am a marketer; and I run marketing campaigns and website design tests a lot. There are many tools - such as online A/B testing calculators - out there to help me test the statistical ...
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### Sample size of population to be representative of all names

Im not a mathematician but need some help trying to calculate the sample size of a population needed to be indicative of the whole population with respect to the prevalence of names. Assuming sample ...
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### Can I use an I-MR chart for a process in which the sampling time is random, or not regular?

I am currently studying a process which produces one sample for testing at one time. Not only that, the time at which the sample is taken for inspection is also not fixed but it varies. The process ...
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### Comparing capture efficiencies of sampling gear?

I have capture data for a fisheries population assessment. Two different crews were used that did surveys separately, each with variations in specifications of the gear that they used (same gear type/...
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### Population growth projection

Que ) Population grows in such a manner that [1/P(t) ] dP(t)/dt is a linear function of log P(t) where P(t) is the population size at time t . Obtain the explicit expression for P(t)* In this question ...
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