# Tagged Questions

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### Proper Sampling - can I collect a two-group sample this way without issues?

I need to collect a two group sample for a comparison analysis (perhaps using logistic regression). The population that I need to extract a sample from is all firms from country A with activities in ...
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### How to run a sensitivity analysis with dependent variables?

I am trying to run a sensitivity analysis on an efficiency indicator: the ratio between nitrogen outputs (milk, meat, crops) and nitrogen inputs (fertilizers, cattle feed, symbiotic fixation…). I ...
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### Which confidence intervals should be used?

I would like to plot 95% confidence intervals for my data. It seems there are multiple options for calculating them, e.g.: (examples shown using R code) ...
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### How to analyze factors that have missing by design values for certain observations?

I am using an analysis for an experiment that I consider suboptimal. I am asking for any suggestions to improve this. I will briefly outline the experiment and what I’ve done, then ask your advice. ...
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### Statistical faults of the article relating GDP growth with certain non-sensical variable

Colleague draw my attention to the following discussion paper. In my opinion this discussion paper is clearly intended as a critique of the routinely published articles in the field. The discussion ...
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### Using ANOVA to analyse a distribution

I found a method in an paper, which I do not quite understand. In this experiment the influence of a within subject factor was analysed. In order to analyse the influence of the factor not only on ...
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### Compare differences or ratios of factors by time

I observe a process in which particles could be detected on a start point, and sometimes cross a border. So I count the number of particles during the days. Which non-parametric method would you ...
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### Make decision which is the relevant value

How to make a decision which key has significant more value then the other for each week? I have no idea how to express this. I think I can only count the number of each key and could compare their ...
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### logdif modell different from log model

I'm not sure if a 1st difference transformation was a good idea. ADF of the dependent variable gave me 0.1177, so I couldn't reject unit root hypothesis, other unit root test though rejected the unit ...