# All Questions

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### In general, does $P(R|N)>P(R)$ implies $P(N|R)>P(N)$ ? Seems to be confirmed by Venn diagrams example but contradiction with Bayes' theorem

Let $R$ and $N$ be two dependent events, such that $P(R|N)>P(R)$. Does this implies that $P(N|R)>P(N)$. The odds are this is true (and equivalently $P(R|N)<P(R)$ implies $P(N|R)<P(N)$). I ...
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4 views

### Sample size for a vector of proportions and simulation

Currently, there are more than 10 variants of omicron virus. Say, variant proportions are X1=0.1, X2=0.35, X3=0.15, etc. I need to calculate the number of samples needed to detect the proportion of ...
8 views

### How to guess a random walk to achieve max sample correlation?

Define this 1-D discrete random walk start from 0: roll a die (the die may or may not be fair), if $d\in\{1,2,3\}$, go left for 1 step, 2 steps or 3 steps ...
• 53
4 views

### How to understand anova in the rms package

There is an example for calculating the Wald Statistics using anova.lrm of rms package. ...
• 47
5 views

### Inconsistent posterior from hierarchical survival model

I asked about this question on Stan forum but no one replied to dual posting here. I'd really appreciate some insight, as I'm completely stuck. I’m trying to do hierarchical survival modeling using ...
• 71
2 views

### What are the inputs of marketing mix modeling?

Given a hypothetical dataset: ...
• 971
15 views

### likelihood ratio tests on bounded parameters

I am confused by the likelihood ratio test's boundary condition limitation. A commonly stated is that it causes problem for variance parameter because it is bounded below by 0. Can these models ...
• 1,502
3 views

### Nonlinear indirect effect in lavaan & semTools

I would like to use semTools to examine several indirect effects. However, some predictors have nonlinear relationships (i.e., quadratic) with the mediators, but I found very little information online ...
• 11
30 views

### Question About Bayesian stats( from a DSP estimation theory book)

from "Fundamentals of Statistical Signal Processing, Volume I: Estimation Theory" It is a fundamental rule of estimation theory that the use of prior knowledge will lead to a more accurate ...
• 51
1 vote
11 views

### Help interpreting the use of Chi-square to determine if race course has any lanes with an advantage

Here's the situation. Say you're given a race course with lanes 1-8 on the water and it is suspected that some lanes are faster than others. Faster lanes would have more higher places (1st, 2nd, etc.)...
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11 views

### Testing difference between two models using WAIC and degrees of freedom of WAIC

I am conducting Bayesian penalised regression, horseshoe specifically, in R using the bayesreg package see here. One model is nested within the other, i.e. to the second model I have simply used all ...
• 2,161
6 views

### How can uncertainties in a generative model be propagated to an overall log-likelihood?

I am trying to use a Bayesian approach to carry out model selection and estimate the posterior distributions for parameters in a peak fitting scenario (quasi elastic neutron scattering). The ...
4 views

### Segmentation 3D architectures

I would like to ask you for advice on the best solution for my problem. I have a task to segment an object based on some of its signal. That is, I have input objects of size T x H x W, where T is time....
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### Incompatible confidence intervals between the series object and the summary output

I am facing a strange behavior with the CausalImpact package that I don't know how to interpret. Below is a reproducible example ...
8 views

### Normal distribution in SPSS [closed]

I have to make an research paper and after I check for my distribution wit kolgoomorov test in SPSS just 3 of my 10 variables didn't had signification, I normalized them with IDF normal from compute, ...
8 views

### Math behind the standardized effects from Minitab

I would like to understand the mathematics behind the Standardized effects (SE) as found in, e.g., Minitab. I'm far from an expert in statistics, but I found this page which treats the same question. ...
1 vote
15 views

### Choosing a unique visitor on the fly

I've been thinking of this as the "Prize of the Week" problem. Suppose you run a shop, and want to give out a prize once a week to someone making a randomly-selected purchase. You give out ...
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