# Questions tagged [subset]

One set, A, is a subset of another, B, if and only if all elements of A are elements of B.

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### How to filter in R with subsets [migrated]

I have a dataframe with columns: coast, weight gain, length gain, release weight, release length. Coast is categorical ("E" or "W") and the other variables are numeric. I would ...
94 views

### Is there a name for the increase in variance upon remeasurement after subsetting with a cut-off value?

Context: My problem relates to estimating effect sizes, such as Cohen's d, when looking at a subset of the population defined by a cut-off threshold. This effect size is the difference in two ...
25 views

### When is subsetting survey data prior to analysis NOT a problem?

Survey researchers are typically advised to not subset their data prior to analysis because it will produce incorrect variance estimates. My understanding of the inferential issue is that removing ...
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### Need help understanding paper by Jolliffe - various methods in choosing subsets for PCA

There's a paper I'm trying to base some work off of called Variable Selection and the Interpretation of Principal Subspaces which uses some various methods to choose subsets of variables. Their ...
7 views

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### Problem with significance of results from regression on subset of data

I have performed a hedonic regression with a database where all the variables are very significant and according to the calculations made in R with a squared R = 0.6123. I have performed the same ...
27 views

### Represent roles intersections

I have 11 roles, who defines rights (read, edit, write) on my application. For exemple I have "Inventory" who contains ressources_read and ...
289 views

### What statistical distribution test to use for comparing Dataset and its subset? [duplicate]

I have two sets, A and B ,containing height of students. Set A contains height of all students in the class and Set B contains height of some students from the same class. Hence, Set B is a subset of ...
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### Which is the event, sample and population, notation confusion

I am really struggling with the notation for this. Below is the slide material followed by what I think it means/where I get stuck. "Some unknown real world quantity $\Theta$ takes values in $\Omega$....
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### Determining whether it matters which subset I pick from my dataset

I'm going to simplify my own research problem with the following example: Lets suppose I have N=40 students in my classroom. I need to select 20 of them to participate in a national math competition. ...
3k views

### Proper variable selection: Use only training data or full data?

I'm going through the lab exercises in "Introduction to Statistical Learning" and am having difficulty understanding the proper way to do best subset selection. On page 248, it states that: ... We ...
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### Foundational sufficient statistics

I've been reading through Casella and Berger's Statistical Infererence and have am having a little trouble understanding something in their explanation of sufficient statistics. Here is the passage ...
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### Resample dataframe by random subset of years

I have a dataset of 59 years worth of daily rainfall data. I'd like to resample the data by 6 randomly selected years 1,000 times, using the entire year of data for each of the 6 years (so 2190 ...
My textbook says that the above follows from the observation: $\{W\leq w\}=\{X\leq w\},\{Y\leq w\}$, How do we prove the above observation?