Statistical Analysis Stack Exchange
Statistical Analysis Stack Exchange

Questions tagged [aggregation]

Refers to "lumping together" potentially inhomogeneous groups of data.

Aggregation refers to "lumping together" potentially inhomogeneous groups of data. The laws of total expectation and variance can be thought of as providing a way to calculate the mean and variance of an aggregated data set, if the variable being conditioned on ($Y$ in the Wikipedia articles) is the grouping variable being aggregated over.

When aggregating data, the resulting distribution is marginal to the original datasets.

259 questions
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What's aggregation bias, and how does it relate to the ecological fallacy?

The context relates to a situation in I am interested to see whether class sizes predict test results. I have each individual's test results, and each individual's class size. I've been warned against simply calculating the test result for each…
user1205901 - Слава Україні
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Calculating an aggregated score

I'm out of my element when dealing with statistics, so I hope you'll be able to offer me some guidance. I'm working on a project where students will apply for scholarships, and then a panel of people (reviewers) will independently evaluate each…
Brian Brock
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Aggregation of overlapping intervals

Hello anyone and everyone, I have a data set of traffic flow data, particularly intensity data. I have the traffic counts per minute as the base data and then I am aggregating them into 3 and 5 minute interval. The question is, is it plausible to…
Igor M.
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Nomenclature for Aggregation of Binary Time Series Data with AND or OR

Lets say I have some hourly binary data over a couple days, Datetime Value 2016-01-01 00:00 1 2016-01-01 01:00 1 2016-01-01 02:00 0 2016-01-01 03:00 1 2016-01-01 04:00 0 ... I wish to aggregate this data up to a daily…
josh
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Aggregating Stats When Some Results Are Ignored

This is more of a methodology question than anything. Scenario: you are trying to report average stats between two different groups responding to a variety of optional survey questions. But, (this is the annoying bit) somebody says "if the number of…
Tbola
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Loss of variance in aggregated data?

I have a nested dataset where information on individual workplace characteristics is available on the case level, and data on recorded sick leave on the group level. 7k individuals are nested within approx. 40 groups and, consequently, the sick…
ym.87
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Multiple data points per subject? Aggregation to mean with or without considering subjects

I am currently arguing with someone on how to correctly treat data with multiple observations per subject. More specifically data was gathered from 100 participants 8 times per day for 5 days (resulting in 40 observations per participants for each…
Dimitar V
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