# Questions tagged [example]

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### Practical examples of multiplicative regression model

Majority of the examples of multiple regression in practice is written as additive model. Can you give me some practical examples of a multiplicative regression model (i.e. a model that can be fitted ...
33 views

1 vote
407 views

### Downward slope but Spearman correlation coefficient is positive and vice versa

Why the slope and the Rho value not the same? For examples, graph H-DSI shows downward slope but the Rho value is positive (P value=0.9603; r=0.009867). Hope someone can explain it. Thank you. H DSI ...
99 views

### Is there a real example in which a correlation finally leads to the discovery of a non-trivial causal relationship?

More specifically, I am wondering if there is such an example satisfying the following criteria: The example happened after 1888, it would be better to be after 1900—I think few people have the ...
16 views

### Examples of correlated Xs with opposite effect on Y [duplicate]

Could someone give me a simple real life example of how two things can be positively correlated, but they have different (opposite) effects on a third variable? I encountered this scenario and I'm ...
470 views

### Symmetric distribution with finite Mean but no Variance

Is there a symmetric continuous distribution that has a finite mean, but no variance? What I've found so far: For instance the Pareto distribution satisfies everything but the symmetry, so I was ...
156 views

### concrete example of degenracy

I was reading on degeneracy. Can someone give concrete example of following definition. A kernel $h$ is symmetric if it is invariant under permutations of its inputs. $S_m$ be symmetric group ...
867 views

### Real-life example in which Markov chain Monte Carlo is desirable? [duplicate]

A typical introduction to the Metropolis--Hastings algorithm, and hence to Markov chain Monte Carlo techniques in general, starts with the following assumptions on some probability distribution $P(x)$ ...
1 vote
96 views

### Kwiatkowski–Phillips–Schmidt–Shin (KPSS) and Augmented Dickey–Fuller (ADF) Tests

I have been searching for a sample usage of the KPSS and ADF tests, however I can only find pages reporting examples using R or Python. The mathematical definition of the KPSS test also seems to be ...
3k views

### How to use missForest in R for test data imputation?

I want to use the R missForest() function at work to perform missing value imputation. However, after reading up on the algorithm more, I can't decide how to impute ...
129 views

### On the difference between the main effect in a one-factor and a two-factor regression

Consider a linear regression (based on least squares) on two predictors including an interaction term: $$Y=(b_0+b_1X_1)+(b_2+b_3X_1)X_2$$ $b_2$ here corresponds to the conditional effect of $X_2$ when ...
164 views

### Statistics/Data Science: Real world example for a donut destribution?

I'm looking for different real world examples for donut distribution (in the statistic meaning). https://i.stack.imgur.com/VrGq4.jpg For the most other distributions, I found good examples. But for ...
1 vote
28 views

### Am I understanding correctly the Maximum Entropy concept using a sentence?

In the sentence "The house is white", each word carries a different amount of information. If I remove the "The" from the sentence, almost nothing happens: you are still able to ...
116 views

### Examples of positive definite periodic covariance matrices

My aim is to find a few examples of positive definite covariance matrices $\pmb{R} = \{R(s,t)\}_{s,t=1}^n$ that satisfy $$R(s,t) = R(s+T, t+T),~~~1\leq s,t \leq n-T,$$ where $T$, $1\leq T\leq n-1$, is ...
29 views

### Question about latent variables in Co-integration Regression

I have a question about cointegration regression models as follows: Is it common to have latent variables or regressors with measurement error in the cointegrating regression model? Is it highly ...
519 views

### Two random variables not correlated with normal distribution, whose sum is normal but which are not independent

The example based on the Rademacher distribution of two random variables, $X$ and $Y$, normally standard distributed, not correlated, but not independent, is well known. Additionally, in this example ...
1 vote
107 views

766 views

### Regression example for one-dimensional input

For some educational purposes, I need a realistic regression example where the input space is one-dimensional, i.e. $x\in\mathbb{R}$. I do not want to use any dummy approaches such as simulation from ...
1 vote
604 views

### Difference between instance-based and example-based Learning

I've read both the terms instance-based and example-based learning in some contexts, e. g. instance-based learning for label ranking and example-based for general text classification tasks. Is there ...
2k views

### Negative autocorrelation in linear regressions : examples and consequences

I am wondering if there are classical (or not so classical) examples of negative autocorrelation in a regression model. To expalin the context : I am explaining OLS limitations, heterosckedasticity ...
4k views

### Real world practical Outliers/Anomalies

I want to have some real life and practical examples for anomalies that can be expressed like a scenario. For example in a country following left-hand driving, a vehicle moving in a wrong direction ...
1 vote