In greta: Simple and Scalable Statistical Modelling in R

Lightspeed

Lightspeed estimates a linear normal model without predictors. The data are 66 measurements from Simon Newcomb and represent the time required for light to travel roughly 7500 meters.

See also the Stan examples for details.

data

y <- c(28, 26, 33, 24, 34, -44, 27, 16, 40, -2, 29, 22, 24, 21, 25, 
       30, 23, 29, 31, 19, 24, 20, 36, 32, 36, 28, 25, 21, 28, 29, 
       37, 25, 28, 26, 30, 32, 36, 26, 30, 22, 36, 23, 27, 27, 28, 
       27, 31, 27, 26, 33, 26, 32, 32, 24, 39, 28, 24, 25, 32, 25, 
       29, 27, 28, 29, 16, 23)
n <- length(y)

greta code

beta  <- variable()
sigma <- variable(lower = 0)

distribution(y) <- normal(beta, sigma)

Stan code

cat(readLines('https://raw.githubusercontent.com/stan-dev/example-models/master/ARM/Ch.8/lightspeed.stan'), sep = '\n')

greta documentation built on Sept. 8, 2022, 5:10 p.m.