# All Questions

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### How to find “theoretically best” model?

Given the common problem of predicting response variable $Y$ from predictor variables $X$ and $Z$, is there any way to determine the "theoretical best" prediction possible for a response variable? ...
261 views

### Approximate $e$ using Monte Carlo Simulation

I've been looking at Monte Carlo simulation recently, and have been using it to approximate constants such as $\pi$ (circle inside a rectangle, proportionate area). However, I'm unable to think of a ...
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### Using a dichotomous categorical variable that has an underlying continuous dichotomy in a multiple regression?

FINAL EDIT I just found a good answer to this question in another thread in the forum here, therefore, I think this question could be closed. Thanks so much for your help and the clarification about ...
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### Regression discontinuity design

I am trying to apply an RRD design to a set of spatial data from rasters. The approach has been widely used in the development economics literature and I know that it is a sound methodological ...
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### How to combine two measurements of the same quantity with different confidences in order to obtain a single value and confidence

Back in the lab at university, we were taught to measure the quantity of interest some number of times (call this N), and then calculate the standard error. The underlying assumption here is that you ...
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### Statistical reasoning in board game [duplicate]

In each round of the board game "The Resistance" three players are randomly and secretly chosen to be spies while the rest of the players are part of the resistance. The spies are then made aware of ...
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### Interpretting results in Association - market basket [on hold]

I'm doing a market basket analysis in RapidMiner. The goal is to figure out whether to stop selling a group product "x", there will be drop in sales of other products. The group of product "X" is ...
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### References for Combine Seasonal Period in Seasonal Time Series

I'm in a middle writing my thesis. I got confused for find the references which said period of seasonal could be chosen from the small period which already containing another periods. Here is my ...
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### which technique will be appropriate for my problem

suppose i have three independent variables x1 x2 x3 and one dependent variable y with following defination x1=test1 scores (20% of final score) x2=test2 scores (10% of final score x2=test3 scores (30% ...
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### Proving a property of the Wishart distribution

I would like to prove that, if $X \sim W(V,n)$, then $CXC^T \sim W(CVC^T,n)$ where $W$ is a Wishart distribution. A point in the right direction would be welcome - happy to admit that I may have ...
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### Calculate state change probability

I am having telco order management data and need to calculate the probability of each order going through different stages. data is like this: Order No; product_type; time spent in step1; time ...
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### Can you give an intuition behind the FTRL update step?

The follow-the-regularized-leader proximal gradient descent uses this update step: $$w_{t+1}= argmin_w( w\cdot \sum_{s=1}^t g_s +\frac{1}{2}\sum_{s=1}^t\sigma_s(w-w_s)^2+\lambda_1|w| )$$ We are on ...
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### Two-stage sampling with R [on hold]

I have been trying to do a two-stage survey sampling using the mstage function. My sampling frame consists of 23 primary sampling units (...
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### Having trouble making a scatterplot out of my data in R studio. [on hold]

As the title says. Instead of a typical scatterplot with an x and y axis, I get something with a third increment on the right side of the graph. What am I doing wrong?
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### If you transform response time data, e.g. to generate a CI, do you transform the values back for interpretation? [duplicate]

I would like to create a CI or highest density interval for response time data. The distribution of the response times is quite skewed and I think about transforming them by LN(y). However, my ...
5 views

### Node dimension does not match in WinBUGS [on hold]

I'm using WinBUGS14, though I am not adept at it. I have worked through several problems before, however, this error seems to be tripping me up. Node dimension does not match This EXACT code has ...
45 views

### How estimate straight line using linear regression with some outliers

I have a data set ...
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### Conceptual help with scalar invariance testing

I'm having trouble understanding why scalar invariance is needed in testing a certain type of model. Let's say I have employee and supervisor ratings of deviance. I want to look at what happens when ...