Questions tagged [reproducible-research]

Research practice of making full experimental description, entire collected data, and all the data analysis scripts publicly available, so that the published results can be reproduced elsewhere.

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Can I use both a Kolmogorov–Smirnov test and a T-test to compare two distributions?

I have two distributions (N ~ 300, μ = 1.89 and σ = 0.97) and (N ~ 40, μ = 1.74 and σ = 1.18). A ks_2samp returns statistic = 0.2 and p-value = 0.057. Therefore, I cannot reject the null hypothesis ...
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Could we estimate replicability of empirical research with conformal predictions?

A review article Threats of a Replication Crisis in Empirical Computer Science reviews reproducibility issues. The authors present distinctions among repeatability, replicability, and reproducibility. ...
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Help interpreting event study methodology of a famous research article

I wonder if someone out there familiar with reading research articles, especially finance research can help me interpret which event study methodology the author uses in her famous research article. ...
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How to interpret difference-in-differences results?

I'm relatively new at working with R and I have some issues with interpreting my results. My goal is to analyse the vote share of left-wing parties in 4 countries after 2008 by using difference-in-...
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Using an online tool to compare different groups without raw data

I have a question regarding using the https://statpages.info/anova1sm.html tool that has been mentioned here and there for comparing means in different groups. I am currently looking to compare my ...
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Gauge R&R analysis - Preicision of a system

I never attempted to do a GR&R analysis before so I'm sharing an overview of what I would like to attempt to do and hopefully I would get some insight/advice/reference on which approach I should ...
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What is the best way to design a inter vs intra-operator reliability study?

I am hoping to get a good idea on how to create and write up a design to measure the variability and accuracy of an imaging technique involving transnational medical data. Ideally - the study would ...
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Understanding a simple post-hoc power analysis of effect size

I am trying to understand a relatively straightforward paragraph found in "Gun Shows and Gun Violence: Fatally Flawed Study Yields Misleading Results" by Wintermute et al that appeared in ...
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2 votes
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Help in re-producing the calculation of the standardised difference for a multinomial variable

I am interested in calculating the standardised difference for a multinomial variable. In R there is a package called tableone that produces such calculations (https://cran.r-project.org/web/packages/...
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1 vote
2 answers
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Random number generator seed in R

I have a question about the random number generator seed number in R. Recently, I am trying to solve the exercises in the book named "An Introduction to Statistical Learning". When I ...
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Best Practices in Sampling Large Datasets

I am working on a research paper concerning developing a CNN model for a multi-class classification on images. I have a large dataset consisting of 3 classes summing up to 20000 images. Class 1 has ...
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To what degree does reproducibility of research differ across disciplines?

Have there been any statistics meta studies that compare the reproducibility of results, as well as the willingness of researchers to provide reproducible data, analysis, and code, in their studies ...
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Data science project examples based on Cookie Cutter Data science template [closed]

Interested by production ready data science project do you have any public github reference concrete implementation? As an example i found this project template structure https://drivendata.github.io/...
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What is the right machine learning research methodology to compare two neural network approaches against eachother?

I am new to machine learning research, and I have a general question regarding how to compare different models on the same data set. How does a top researcher do this, and what is expected from a ...
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Ablation Study training until when?

Given that deep learning models can take weeks to train, having to train 20 different models becomes infeasible when performing an ablation study. Are there some formally accepted common practices on ...
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Predict values from complex Rjags model

It's the first time I'm working with R2Jags, MCM chains and Bayesian models and I'm having trouble to compute the predicted values for my model. The model is based on research by Hallmann et al. 2017, ...
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Reproducibility Between Remote and Local Computer [closed]

I am currently using R, RStudio, and a remote computer (using an R script) to run the same ...
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3 votes
1 answer
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Appropriate model for amount of statistical errors in articles

I recently started my PhD and I am currently working on a project about finding statistical reporting errors. Our work is similar to Nuijten et al. (2016) only for economics. So, I have a database ...
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Failing to replicate the signal-to-noise ratio from original lasso paper

I'm referencing example 1 under the simulations section from Tibshirani. In short there's a model in the form $$ y = \beta^Tx + \sigma \epsilon, $$ where $\beta = (3, 1.5, 0, 0, 2, 0, 0, 0)^T$ and $\...
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Random number generator independence

I have a naïve question about random number generators. Say I want to generate a set of random variables from different exponential distributions,$$X_i \sim \mathcal {Exp}(\lambda_i)$$ Assume the$X_i$'...
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Pearson's Correlation between samples after PCA dimensionality reduction

This question is closely related to [Is it acceptable to reverse a sign of a principal component score?. I have a matrix A with Samples in row and Features in column. I apply PCA on A and get a ...
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Research on neural networks mimicking behavior

My question is regarding neural networks mimicking noise specifically. The idea. I have clinically clean image generated by a ray tracer and a neural network (type does not matter) that is mimicking ...
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1 vote
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How to determine statistical significance of physics dataset?

I am working on a physics paper, which looks at the dependence of resistivity on physical temperature. I obtained data showing a linear trend of the form $$\rho(T)=\rho_0[1+\alpha(T-T_0)]$$ Based on ...
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Setting seeds despite repeated training of CNNs?

I would like to compare the classification performance (like accuracy, precision, recall etc.) of different CNN architectures. I'm using Google Colab (GPU support), Tensorflow and Keras. Since it is ...
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1 answer
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How to compare the performance of different SVMs and CNNs?

I'm a beginner in machine learning und I have a problem to find the best way to compare the performance (accuracy) of different SVMs and CNNs (Jupyter Notebook)? The CNNs I train in Google Colab with ...
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1 answer
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How to compare CNN models with non-reproducible results?

I try to compare different CNN models. I use Keras and for training, I use a GPU, Google Colab with Tensorflow backend. Unfortunately I'm not able to create the same initial conditions for the CNNs (...
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Does a high negative concordance imply reproducible features

Does a high negative(-1) Lin's concordance correlation coefficient(Lins CCC) imply reproducible features ? I am calculating Lin's CCC of radiomic features between two different CT scan settings , ...
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2 votes
1 answer
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Is most published research indeed false?

I have come across (Ioannidis, 2005) which explains several reasons (mainly statistics-related, that's why I post this question here) to justify the claim that most published research is indeed false. ...
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2 votes
1 answer
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Reproducible numbers in Keras/TensorFlow

Every time I run a Keras/TensorFlow code gives different results. Can someone suggest how to get reproducible numbers?
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8 votes
1 answer
384 views

Why do people use PCA when it has so many issues?

(This is a soft question) Recently I'm learning Principal Component Analysis, and it appears to have a lot of issues: You have to transform the data to roughly the same scale before applying PCA, but ...
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1 vote
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Replicating a wrong analysis

A study measures the performance of patients and controls in two tasks. In task 1, a t-test reveals no significant differences between patients and controls. In task 2, a t-test reveals significant ...
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4 votes
1 answer
110 views

Why replication studies use two-tailed tests?

I have been searching replication studies and I found that all of them use two-tailed tests. For example: Open Science Collaboration. (2015). Estimating the reproducibility of psychological science....
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7 votes
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Has the reproducibility crisis affected confidence intervals as well?

The reproducibility crisis has given many pause over the value (?) of $p$-values to measure the relevance of statistical findings. Given the interpretation of a $p$-value and some knowledge of ...
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What is a good machine learning academic research workflow/tools? [closed]

I'm interested in ML research and want to get some insights into how its done in practice. In particular: What kind of data are you dealing with? How are you dealing with hyper-param optimization? ...
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Use Deep learning or RL to maximize long term hit in caching file?

Suppose I have F video files with different file size and with different popularity. I have a memory cache of fixed size. What I have to do is following: I want to cache n files (n < F) in ...
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6 votes
2 answers
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Choosing the "Correct" Seed for Reproducible Research/Results

I have created this post to spark a discussion around an idea I had regarding the choice of the seed number used to replicate the results of a statistical model. Here is some background on how I came ...
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2 votes
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Put Together Results from GLM Gamma Models

I have a set of healthcare data in which I used GLM Gamma to model the healthcare spending. Then I am trying to put together the results in a style that is similar to this: http://onlinelibrary.wiley....
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6 votes
1 answer
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"report the statistical results of the analysis without the covariate"

This is from Psychological Science 22(11), p.1363: If an analysis includes a covariate, authors must report the statistical results of the analysis without the covariate. Reporting covariate-...
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1 answer
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When to calculate Cronbach's alpha for a paper?

I am doing my undergraduate thesis, and I wonder if I need to do the Cronbach's alpha from my data set, or if I should use the Cronbach's alpha from the commercial questionnaire I will use for this ...
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0 votes
1 answer
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I have all negatives in (some) of my folds in cross validation. Seeking best way to calculate AUC using R in this scenario?

Problem The title explains my problem. I cannot calculate AUC as things currently stand because some of my data sets have only negatives. I have three possible solutions and I need input from more ...
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1 vote
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Two samples t-test and ANOVA

B) When doing a two way ANOVA After calculating the sum of squares column(between), the sum of squares error(within), and the sum of squares block. 1. Are there any other sum of squares? 2. What is ...
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0 votes
1 answer
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Simple questions about reproducibility

Suppose we made $m$ tests in 2 samples from the population. For simplicity, we compared $m$ traits (i.e. bmi, temperature, height, etc) for equality in means between 2 groups of people (i.e. Germans ...
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1 vote
1 answer
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How to prove two methods are "similar"?

We are testing two imaging machines. One of the machines has been validated numerous times. However, we built the new machine and we need to prove that it is similar/comparable to the validated ...
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Calculate Cronbach's alpha for three observers

I have a dataset which contains 100 observations, and I asked three expert to describe each observation by one of the letters {A,B,C}. The following three tables shows a sample of the dataset with the ...
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1 vote
1 answer
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Evidence for data mining (specification search) in published results [duplicate]

Is there an established way to assess the prevalence of data mining (as in specification search, not in the machine learning sense) in academic publications? I vaguely remember hearing something ...
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6 votes
1 answer
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Statistical significance, repeatability, and sample size (50 shades of grey)

Reading about the problems with significance I wondered how one would approach an experiment in the right way, considering that in practice the sample size cannot be arbitrarily large. While some ...
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95 votes
2 answers
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How much do we know about p-hacking "in the wild"?

The phrase p-hacking (also: "data dredging", "snooping" or "fishing") refers to various kinds of statistical malpractice in which results become artificially statistically significant. There are many ...
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1 answer
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How to calculate Cronbach's alpha

For my dissertation I am observing horse race videos to see if horses are right or left handed. In flat races where the horse comes out of the starting stalls I observe which leg (right or left) they ...
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7 votes
1 answer
653 views

Ethics of publishing covariate matrix

I am planning to submit a paper with a Structural Equation Model applied into a dataset built with measurements from schizophrenic patients. In the spirit of promoting an open research culture I've ...
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4 votes
1 answer
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How can I define a multiple-record ID variable for a Cox model in R?

I'm reproducing and translating data from an old Stata file into R for future expansion and analysis. The original data uses a Cox proportional hazard model with ...
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