# Tagged Questions

Refers generally to making substantive conclusions from the results of a statistical analysis.

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### Is it possible to get an interaction in Split Plot ANOVA (p = .02) and at the same time get a profile plot for estimated marg. M with no interaction?

In Split Plot/Mixed Design between-within (2by2 ANOVA with 3 DV) I got a significant interaction for one of my DV at F(1,196) = 5.467, p = .02. But when checked a profile plot for estimated marginal ...
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### How to interpret R Pearson's correlation test?

I am trying to learn a bit of R and statistics so as "toy project" I have started from the famous Iris dataset (150 rows, 3 classes). I have applied to two features the "correlation test" in this way: ...
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### How to report the results of a GLM from R output

I am currently writing up my 4th year dissertation in Ecology having completed fieldwork and analysis on the effects of various environmental variables on Butterfly abundance. I have conductuded a ...
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### The meaning of Classification Accuracy

I'm working on San Francisco Crime dataset, and only get about 20% classification accuracy. I used Random Forest Method. So how I can Interpret the result? I did EDA firstly, but how can I use EDA to ...
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### How to interpret a log transformed (x+c)? [duplicate]

I need to use log-log regression and because I have lots of zero values I tried to add a very small constant c=8E-12 to x and it works pretty good. Xs are very small probabilities. lnY= a + b ln ...
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### Does rounding introduce variance into estimates?

It is often recommended to round parameter estimates to avoid suggesting more precision than the data really have, e.g. here. I understand rounding does not introduce bias, as long as an unbiased ...
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### VAR impulse response interpretation when differencing

I am trying to formulate a way of how to think about differencing when interpreting impulse responses produced by VARs. There are two different views I came up with. First view is that a temporary ...
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### Correlation & Stationarity

In a purely historical or backward-looking, descriptive context, is it incorrect to naively compute the covariance $$\mathbf{E}(XY) - \mathbf{E}(X)\mathbf{E}(Y)$$ and Pearson correlation coefficient ...
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### What is the difference between a cross-level Interaction and a random slope in a mixed effect model?

Can someone please articulate the differences between a "cross-level interaction" and a mixed effects model? Two areas that are unclear: - Are all random slopes the same as "cross-level ...
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### How to interpret glmmPQL summary value

I'm doing a GLMM with quasi-Poisson to check for a spatial correlation between some predator bugs and their prey (count data of predator and prey + added distance of plots). I've added everything into ...
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### Kolmogorov–Smirnov test vs. t-test

I'm having some difficulty in understanding the interpretation of the 2 sample KS test, and how it is different from a regular t test between 2 groups. Lets say I have males and females doing some ...
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### Intuitive explanation of logloss

In several kaggle competitions the scoring was based on "logloss". This relates to classification error. Here is a technical answer but I am looking for an intuitive answer. I really liked the ...
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### Interpretation of coefficients

I know that probably a lot of people already asked about the interpretation of coefficients especially in log-linear models. Unfortunately, I was not able to find an answer to my specific question: I ...
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### How to identify the prediction equation from a regression model using splines

I find it difficult to connect the coefficients of a regression model that includes splines to the actual prediction equation. For example, how could that be done with the following model? ...
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### Interpreting t-test results : Need a sanity check regarding t-statistic sign

Rookie stat question here, hoping to get a sanity check... So lets say that I have two groups, A and B. I run a two tailed t test in R, t.test(A, B, var.equal = TRUE). If my t-statistic value ...
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### Understanding the price elasticity interaction in a regression model

The question that follows is derived from a SAS User's Group paper available on the web (Price and Cross Price Elasticity Estimation Using SAS). The objective is to calculate price elasticities (own ...
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### ANCOVA interpretation

I have a continuous independent variable (AGE_CONT), a categorical independent variable (EXP_CATER, within subject, three ...
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### How to interpret categorical data in model selection table

I am trying to interpret a categorical result in my AIC model selection table. The model is a glmm binomial distribution with individual pair (dyad) as the random factor. The categorical result I ...
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### Fitting Zipf Mandelbrot and use Chi-square test in R

I have a dataset with hashtags and their frequencies (~370k frequencies), as for example (after a sort): ...