# Tagged Questions

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### Sample Representing a Different Population

I have two sets of populations: containing 1.5 million and 5.5 million units. I need to select a sample out of 5.5 million population so that the sample represents the 1.5 million population based on ...
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### How can I calculate when a text corpus is representative of a language?

I am collecting and analyzing articles and other publications for building a text corpus. I'd like to know how to calculate when my text corpus is representative of a field. That is, how many texts, ...
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### How to best represent a geographical area as point

I need to check a relationship(?) between land surface temperature (LST) and total population census tract (shapefile) wise where i am trying to relate social factors (e.g. total population, female ...
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### Hand-picked items in the training set, good idea?

The training, validation and test sets for the classification problem I'm working on were randomly sampled from real data. Because of this, I am fairly confident that there are representative. I want ...
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### Instagram representative sample

I am doing a survey to study both sellers and consumers behaviour on Instagram in Kuwait. My question is how to decide on the sample size? What sampling design should I use since there is no sampling ...
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### Blocking and representative samples

I am trying to measure the Net Promoter Score of a segment of customers for an online product. There is an attribute of these customers that I believe might affect their Net Promoter Score. So I want ...
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### Splitting an i.i.d. sample in two by criterion - what survives of independence and population representation?

Assume that I have available a $k$-dimensional i.i.d. sample of size $n$, collected in the $n \times k$ matrix $\mathbf X$. Each column represents a series of realizations from a random variable. ...
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### Find sample size representative of data

I have data from multiple farms, showing how many healthy and lame animals are found on each farm, and how many animals were there in total. I would like to calculate, statistically, how many animals ...