Models

stan_glm
 family:       gaussian [identity]
 formula:      mpg ~ displacement + 1
 observations: 398
 predictors:   2
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             Median MAD_SD
(Intercept)  35.2    0.5  
displacement -0.1    0.0  

Auxiliary parameter(s):
      Median MAD_SD
sigma 4.7    0.2   

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* For help interpreting the printed output see ?print.stanreg
* For info on the priors used see ?prior_summary.stanreg
Characteristic Beta 95% CI1
(Intercept) 35 34, 36
displacement -0.06 -0.06, -0.06
1 CI = Credible Interval