Evaluate a variable so that it can appear in a code block for R markdown












2















I am using R Markdown to generate practice problems for a statistics class, and I like to include some randomness so that there can be multiple versions of the same problem. The students are just starting to use R themselves and I would like to be able to show the correct values in the answer R code. Basically I want to achieve something like this...



Question:



```{r, include=FALSE}

conf <- sample(c(0.9,0.95,0.99), 1)

```

What is the `r conf * 100`% confidence interval for the slope coefficient of your regression "reg"?


Answer:



To get the correct answer run the following code

```{r}

confint(reg, level = magic_function(conf))

````


where the magic_function is some function that will make the code block in the generated document look something like this...



confint(reg, level = 0.95)





r r-markdown knitr







share|improve this question


















  • 3





    I think this can be done using knit_expand; see the regression model example in the knit_expand vignette.

    – user2554330
    Nov 28 '18 at 17:33
















2















I am using R Markdown to generate practice problems for a statistics class, and I like to include some randomness so that there can be multiple versions of the same problem. The students are just starting to use R themselves and I would like to be able to show the correct values in the answer R code. Basically I want to achieve something like this...



Question:



```{r, include=FALSE}

conf <- sample(c(0.9,0.95,0.99), 1)

```

What is the `r conf * 100`% confidence interval for the slope coefficient of your regression "reg"?


Answer:



To get the correct answer run the following code

```{r}

confint(reg, level = magic_function(conf))

````


where the magic_function is some function that will make the code block in the generated document look something like this...



confint(reg, level = 0.95)





r r-markdown knitr







share|improve this question


















  • 3





    I think this can be done using knit_expand; see the regression model example in the knit_expand vignette.

    – user2554330
    Nov 28 '18 at 17:33














2












2








2








I am using R Markdown to generate practice problems for a statistics class, and I like to include some randomness so that there can be multiple versions of the same problem. The students are just starting to use R themselves and I would like to be able to show the correct values in the answer R code. Basically I want to achieve something like this...



Question:



```{r, include=FALSE}

conf <- sample(c(0.9,0.95,0.99), 1)

```

What is the `r conf * 100`% confidence interval for the slope coefficient of your regression "reg"?


Answer:



To get the correct answer run the following code

```{r}

confint(reg, level = magic_function(conf))

````


where the magic_function is some function that will make the code block in the generated document look something like this...



confint(reg, level = 0.95)





r r-markdown knitr







share|improve this question














I am using R Markdown to generate practice problems for a statistics class, and I like to include some randomness so that there can be multiple versions of the same problem. The students are just starting to use R themselves and I would like to be able to show the correct values in the answer R code. Basically I want to achieve something like this...



Question:



```{r, include=FALSE}

conf <- sample(c(0.9,0.95,0.99), 1)

```

What is the `r conf * 100`% confidence interval for the slope coefficient of your regression "reg"?


Answer:



To get the correct answer run the following code

```{r}

confint(reg, level = magic_function(conf))

````


where the magic_function is some function that will make the code block in the generated document look something like this...



confint(reg, level = 0.95)





r r-markdown knitr




r r-markdown knitr






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Nov 28 '18 at 17:19









Joseph StoverJoseph Stover

46729




46729








  • 3





    I think this can be done using knit_expand; see the regression model example in the knit_expand vignette.

    – user2554330
    Nov 28 '18 at 17:33














  • 3





    I think this can be done using knit_expand; see the regression model example in the knit_expand vignette.

    – user2554330
    Nov 28 '18 at 17:33








3




3





I think this can be done using knit_expand; see the regression model example in the knit_expand vignette.

– user2554330
Nov 28 '18 at 17:33





I think this can be done using knit_expand; see the regression model example in the knit_expand vignette.

– user2554330
Nov 28 '18 at 17:33












1 Answer
1






active

oldest

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2














Thanks to user2554330 for putting me on the right path. The following gets me the desired result, although there may be a better way to do this



Answer:



To get the correct answer run the following code

```{r, include=FALSE}

code <- c("```{r}", knit::knit_expand(text = "confint(reg_result, level = {{conf}})", conf = conf), "```")

```

`r paste(knitr::knit(text = code), collapse = 'n')`


UPDATE



It seems that if you want to have more than one such code chunk, you will need to use knit_child instead of knit, like so



Answer:



To get the correct answer run the following code

```{r, include=FALSE}

code <- c("```{r}", knit::knit_expand(text = "confint(reg_result, level = {{conf}})", conf = conf), "```")

```

`r paste(knitr::knit_child(text = code), collapse = 'n')`





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    1 Answer
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    1 Answer
    1






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    2














    Thanks to user2554330 for putting me on the right path. The following gets me the desired result, although there may be a better way to do this



    Answer:



    To get the correct answer run the following code
    
```{r, include=FALSE}
    
code <- c("```{r}", knit::knit_expand(text = "confint(reg_result, level = {{conf}})", conf = conf), "```")
    
```
    
`r paste(knitr::knit(text = code), collapse = 'n')`


    UPDATE



    It seems that if you want to have more than one such code chunk, you will need to use knit_child instead of knit, like so



    Answer:



    To get the correct answer run the following code
    
```{r, include=FALSE}
    
code <- c("```{r}", knit::knit_expand(text = "confint(reg_result, level = {{conf}})", conf = conf), "```")
    
```
    
`r paste(knitr::knit_child(text = code), collapse = 'n')`





    share|improve this answer






























      2














      Thanks to user2554330 for putting me on the right path. The following gets me the desired result, although there may be a better way to do this



      Answer:



      To get the correct answer run the following code
      
```{r, include=FALSE}
      
code <- c("```{r}", knit::knit_expand(text = "confint(reg_result, level = {{conf}})", conf = conf), "```")
      
```
      
`r paste(knitr::knit(text = code), collapse = 'n')`


      UPDATE



      It seems that if you want to have more than one such code chunk, you will need to use knit_child instead of knit, like so



      Answer:



      To get the correct answer run the following code
      
```{r, include=FALSE}
      
code <- c("```{r}", knit::knit_expand(text = "confint(reg_result, level = {{conf}})", conf = conf), "```")
      
```
      
`r paste(knitr::knit_child(text = code), collapse = 'n')`





      share|improve this answer




























        2












        2








        2







        Thanks to user2554330 for putting me on the right path. The following gets me the desired result, although there may be a better way to do this



        Answer:



        To get the correct answer run the following code
        
```{r, include=FALSE}
        
code <- c("```{r}", knit::knit_expand(text = "confint(reg_result, level = {{conf}})", conf = conf), "```")
        
```
        
`r paste(knitr::knit(text = code), collapse = 'n')`


        UPDATE



        It seems that if you want to have more than one such code chunk, you will need to use knit_child instead of knit, like so



        Answer:



        To get the correct answer run the following code
        
```{r, include=FALSE}
        
code <- c("```{r}", knit::knit_expand(text = "confint(reg_result, level = {{conf}})", conf = conf), "```")
        
```
        
`r paste(knitr::knit_child(text = code), collapse = 'n')`





        share|improve this answer















        Thanks to user2554330 for putting me on the right path. The following gets me the desired result, although there may be a better way to do this



        Answer:



        To get the correct answer run the following code
        
```{r, include=FALSE}
        
code <- c("```{r}", knit::knit_expand(text = "confint(reg_result, level = {{conf}})", conf = conf), "```")
        
```
        
`r paste(knitr::knit(text = code), collapse = 'n')`


        UPDATE



        It seems that if you want to have more than one such code chunk, you will need to use knit_child instead of knit, like so



        Answer:



        To get the correct answer run the following code
        
```{r, include=FALSE}
        
code <- c("```{r}", knit::knit_expand(text = "confint(reg_result, level = {{conf}})", conf = conf), "```")
        
```
        
`r paste(knitr::knit_child(text = code), collapse = 'n')`






        share|improve this answer














        share|improve this answer



        share|improve this answer








        edited Nov 28 '18 at 20:32

























        answered Nov 28 '18 at 19:27









        Joseph StoverJoseph Stover

        46729




        46729
































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