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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 make 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.

Setup Stata Engine

(If necessary, manually specify the Stata executable location.)

library(Statamarkdown)

## Stata found at /Applications/StataNow/StataMP.app/Contents/MacOS/StataMP

## The 'stata' engine is ready to use.

An Example

In this example we load the data and calculate a new variable in a first code chunk. Then in a later code chunk we also use the data, including the new variable.

First code block:

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

Second code block:

Then you can use the data and 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
------------------------------------------------------------------------------

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