Data Science Fact @DataSciFact
Daily data science tweets from @JohnDCook. JohnDCook.com Houston Joined November 2010-
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R package for generating synthetic data sets synthpop.org.uk
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One person's meta data is another person's data. It's all data, just different perspectives.
'Data inherently has all of the foibles of being human. Data is not a magic force in society; it's an extension of us.' -- Mark Hansen
A small p-value means the data you saw were unlikely, assuming the null hypothesis AND assuming all your implicit assumptions are true.
Best fit to three data points johndcook.com/blog/2023/07/0…
'homoscedastic' means constant variance, e.g. for regression errors
Retraction Watch retractionwatch.com
The Kalman filter does not assume Gaussian noise but is optimal in the case of Gaussian noise.
Interim analysis, futility monitoring, and predictive probability johndcook.com/blog/2016/10/1…
The Mount Everest Regression Fallacy emilkirkegaard.com/p/mount-everes…
logit(p) = log(p/(1-p)) is used as a link function in logistic regression
'If more than 10% of what you do ends up being directly useful, you are doing well.' -- Sir David Cox
Given a binomial(n, p) sampling distribution, the beta distribution is a conjugate prior on p. johndcook.com/blog/conjugate…
By convention, statistics often uses Roman letters for observables and Greek letters for parameters.
Posterior odds = prior odds * likelihood ratio
Instead of 'confidence interval,' let's say 'uncertainty interval' andrewgelman.com/2010/12/21/let…
Occam's razor and Bayes' theorem johndcook.com/blog/2011/01/1…
'We can only connect the dots that we collect.' -- Amanda Palmer
The sample variance of normally distributed data has a gamma distribution.
'Variance is the tendency to learn random things irrespective of the real signal.' -- Pedro Domingos
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