Each code chunk in your dynamic markdown document runs as a separate
batch file in Stata. This means that the results of one code chunk do
not automatically carry over to the next. You
can have the results of a chunk carry over to all subsequent chunks by
using the collectcode=TRUE
chunk option.
Collected code accumulates, and runs silently before each subsequent chunk.
(If necessary, manually specify the Stata executable location.)
library(Statamarkdown)
Stata found at C:/Program Files/Stata17/StataSE-64.exe
Found a 'sysprofile.do'
The 'stata' engine is ready to use.
In this example we calculate a new variable in a first code chunk. Then in a later code chunk we also use the new variable.
In the first code chunk, use the collectcode
option.
```{stata first-Stata, collectcode=TRUE}
sysuse auto, clear
generate gpm = 1/mpg
summarize price gpm
```
Which looks like this in your document:
sysuse auto, clear
generate gpm = 1/mpg
summarize price gpm
(1978 automobile data)
Variable | Obs Mean Std. dev. Min Max
-------------+---------------------------------------------------------
price | 74 6165.257 2949.496 3291 15906
gpm | 74 .0501928 .0127986 .0243902 .0833333
Then you can use the new variable in a later code chunk.
```{stata second-Stata}
regress price gpm
```
Which looks like this in your document:
regress price gpm
Source | SS df MS Number of obs = 74
-------------+---------------------------------- F(1, 72) = 35.95
Model | 211486574 1 211486574 Prob > F = 0.0000
Residual | 423578822 72 5883039.19 R-squared = 0.3330
-------------+---------------------------------- Adj R-squared = 0.3238
Total | 635065396 73 8699525.97 Root MSE = 2425.5
------------------------------------------------------------------------------
price | Coefficient Std. err. t P>|t| [95% conf. interval]
-------------+----------------------------------------------------------------
gpm | 132990 22180.86 6.00 0.000 88773.24 177206.7
_cons | -509.8827 1148.469 -0.44 0.658 -2799.314 1779.548
------------------------------------------------------------------------------