knitr::opts_chunk$set( collapse = TRUE, comment = "#>" )
library(tidyverse) knitr::read_chunk("external_code.R") source("external_code.R")
library(tidyverse) data(diamonds) ggplot(data=diamonds) + aes(x = carat , y = price) + geom_point()
We can see in Figure \@ref(fig:diamond-plot) a scatterplot.
res = sqrt_function(9) res
This paper develops a generalization of the widely used difference‐in‐differences method for evaluating the effects of policy changes.[@athey2006identification]
Some people say that [@vadrevu2018intercomparison] while others [@athey2006identification]
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