# Tagged Questions

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### Is there a name for sum over one set divided by the cardinality of another set?

What is the summation of one set real numbers divided by the cardinality of another set called? $$A \subset\mathbb R$$ $$\frac{\sum A}{|B|}$$ I will try and be specific to my problem because I lack ...
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### Limiting probability of Markov chain(Terminology)

If I am asked to find the limiting probability of a Markov chain, what does this pertain to? $\lim \limits_{n \to \infty} P^n$? Where $P$ is the stepping matrix and $n$ is the number of steps. "What ...
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### Proper name for the generalized binomial distribution with two trials?

Two Bernoulli trials are performed, first with success probability $p_1$ and second with success probability $p_2 \not=p_1$. The resulting distribution for the number of positive outcomes is ...
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### What's the “ridge” in Ridge Regression?

In normal least squares, we try to find $\hat\beta$ which minimizes $$\|y-X\beta\|^2$$ Ridge regression expands this to "penalize" certain values of $\beta$ via a matrix $\Gamma$: ...
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### Descriptive statistics, percentage of values in interval

I have a list of values representing estimation errors, like { 1, 3, 7, 16, 5, 4, 3, 1 }. Now I determine the percentage of estimations below/equal a specified ...
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### For N-day moving average, how is N parameter called?

I'm looking for a good name for the variable. Average window length? Sounds like a term for a glass cutter.
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### What “whisker” means in box-and-whisker plot?

This is a bit off-topic but I can't help thinking about the reason behind naming box-and-whisker plot. "Whisker" according to dictionary is "any of the long stiff hairs that grow near the mouth of a ...
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### In statistics, dispersion denotes how stretched or squeezed a distribution is, but what is the formal definition?

In statistics, dispersion denotes how stretched or squeezed a distribution is, but what is the formal definition by mathematical properties?
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### Statistical Freedom

What is the English counterpart of the French term "statistique libre"? The following excerpt, translated by me from an excellent 70's French textbook in mathematical statistics ([BAR]), defines the ...
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### Basic terms for the elements of an observation, sample?

I'm trying to write a database schema for measurements in a variety of categories, and am having trouble coming up with names for some basic elements. Let's assume we are gathering heart rate and ...
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### Who established the word “ Degree of freedom ” in statistics?

I wonder who is the first one that established and applied the word : "degree of freedom" in statistics? Why he/she need degree of freedom in the calculation of many statistical values?
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### Scalar generalization of variance for multi-dimensionnal random variables

I am wondering how to define a scalar generalization of variance for multi-dimensionnal random variables. In the case of simple multi-dimensionnal spaces where all dimensions have a similar behaviour, ...
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### Probability distribution functions: factorization 3-way implies 2-way?

I recently asked a question about pairwise versus mutual independence (also related to this and this q). However, (1) I inadvertently used incorrect terminology: three events, A, B, C are ...
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### What is the difference between two variables being proportional versus being directly proportional?

I hear these expressions being thrown around, and realize that "proportional" may also incorporate inverse proportion, but are there any other differences?
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### How tuples or rows do usually called in statistics?

Is there a special term for couple of measured values of single event in statistics? This is called record, tuple or ...
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### What is WHSSETIT?

I am working through a 7 step statistical procedure for hypothesis testing. Step 7 has a field marked WHSSETIT?. What does this acronym stand for and what is the ...
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### Generously Feasible?

In my machine learning class I have been provided a weight vector that has the property that it is generously feasible ? Formally, what does generously feasible mean? I can't seem to find a ...
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