# All Questions

138,959 questions
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### Confidence intervals for state space models

i'm looking for on how to calculate the following ICs: smoothing, on-line filter and prediction on state space models. I'm not able to find any formula about them or any matlab command/class. Thanks....
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### Re-scaling of exponentially distributed random numbers

I am trying to generate $M$ random numbers which are exponentially distributed and whose sum adds up to $N$ (for simplicity, $N=1$). I found that the generated numbers are initially exponentially ...
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### How to deal with repeated words in training and testing set using CART?

I have a dataset where a child read a passage out loud. Each row is one word (I’m order of the passage). I have a 1/0 for whether they read the word incorrectly or correctly. I’m trying to predict ...
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### Comparer deux groupes [on hold]

J'ai deux groupe classe, un qui a reçu un cours de mathématique en utilisant la tablette et un autre ayant reçu un enseignement traditionnel. Je dois voir si la tablette a aidé les élèves à obtenir ...
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### Estimation of NegEntropy in MATLAB

I am trying to evaluate the different ICA algorithms using MATLAB. To do that, one of the measure which I use is to estimate the non-gaussianity using NegEntropy. I am trying to find a function which ...
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### Measuring effects of IV (constant) on DV

I have an independent variable (a bias) that is technically a constant. I want to measure the effects of the IV on the DV. How do I do this? I'm using SPSS. Let's say, participants produced A or B ...
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### StepAIC with tslm function in R

I wish to forecast a timeseries and so I use something like this : Suppose I have a data xtrain with V1,V2,V3,V4 as the attribues. Then, I will create a model as follows : form=as.formula(train ~ ...
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### Most influencer city

My Problem goes like this: Suppose the cities of world, each city has a degree of economic collaboration with other cities. I need to detect communities such that the degrees among different cities ...
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### R-Squared for a non linear curve

At the start, please forgive me if my question is too elementary. I am fitting a non-linear curve. Say a parabola. The data points I have are close to a parabola and the best output I get is a ...
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### Local Significance test for composite anomalies

Suppose I have the following 20 points: ...
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### Moderation analysis with non-significant main effects but significant interaction

I am doing a simple moderation analysis with one independent variable (IV), one moderator (M) and one dependent variable (DV). Results indicate that a regression model containing both main effects (...
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### Which statistical tool would be useful to check whether a variable has changed significantly over years

I have precipitation data of around 40 years of 10 stations but some missing data in the middle. I want to check whether the precipitation has changed significantly over the decades in the region so ...
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### How to show a UMVUE exists only if $g(p)$ is a polynomial of degree at most $n$?

Let $X\sim Bin(n,p)$. The problem is to show that a UMVUE can exist for $g(p)$ only if $g(p)$ is a polynomial in $p$ of degree at most $n$. For the case when $g(p) = \frac{1}{p}$ we can show that it ...
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### BayesFactor anovaBF syntax

I want to get Bayes factors for ANOVAs that are analogous to the classical F-tests, and I just want to make sure I understand correctly how to write the syntax, especially regarding subject IDs. For ...
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### hoc test and pearson corelation

Please can you help me how to report post hoc multiple comparison? is it write to report them in that way (M=...., SD=......), i wrote them in that way. And another question how can I report a ...
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### How to transform Beta distribution of second kind into Beta distribution of first kind?

! I tried to solve it in a way but I can't complete in as I don't get any idea how to integrate the Beta kind two integrand within a finite boundary.
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### Use of adjusted R^2 when regressing using overlapping data

Context: Taking time series levels and converting to 10 day changes in levels. Then doing a linear regression on the 10 day changes over a period of time eg 500 overlapping samples, where Y is the ...
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### measurements with gaussian error

I'm reading a printed document(learning material) which says "Person A made measurements of a quantity, with Gaussian errors". To me this expression seems odd and the meaning is unclear. Is that a ...
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### confidence interval for the variance with unknown distribution

Let $X_i \sim \text{iid}(\mu, \sigma^2)$ (the question does not specify whether or not $\mu$ and $\sigma^2$ are known). I have to show the confidence interval for the variance. Since $X_i$ is not ...
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### Why is random sampling a non-differentiable operation?

This answer states that we cannot back-propagate through a random node. So, in the case of VAEs, you have the reparametrisation trick, which shifts the source of randomness to another variable ...
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### Commonly used example data sets

Is there a place where one can get standard example data for various statistics tools to try on? For example, if one is learning about ARIMA models, where would one get data that can be modelled well ...
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### Probability of sparse spectrum

Consider a vector $v$ such that $v \sim \mathrm{Unif}(\mathbb{S}^{d-1})$, the uniform distribution on the unit sphere in $d$ dimensions. Question: is there an upper bound on the probability that $v$ ...
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### Is this a crossover design?

I am working with collaborators who are conducting an education research study to see if there is a difference in learning outcomes between two learning experiences, one with a technology tool (let’s ...
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### What is an appropriate technique for large number of correlated predictor variables with interactions?

I want to allow the effects of a large number of continuous predictor variables to be different depending on which treatment group the individual is a part of. If I had only three continuous ...