What is the procedure for loading a data set from a textbook in R?

[Eclair_de_XII]

Homework Statement

I'm using a textbook called "Introductory Statistics with R" by Dalgaard, and I am having trouble doing one of the problems. It asks me to isolate names from a data set called "juul". But the problem is that I am unable to locate said data set.

Homework Equations

Functions used:
data()
install.packages()

The Attempt at a Solution

The problem is that I am unable to bring it up using the data() function. I have already installed the package that complements the book by typing in "install.packages("ISwR")", but I am still unable to find the data set in question. Do I need to specify where to look for the data set in R, or something?

 

[scottdave]

I am sort of a newbie with R. I've used a different book, but I did find this (and several other links) when I googled "Juul dataset" I hope it helps. It looks like there may be a juul function? https://www.rdocumentation.org/packages/ISwR/versions/2.0-7/topics/juul

 

[Eclair_de_XII]

I don't think it's a function. In the textbook I'm using, it specifically states that it is a data set, one that I am unable to retrieve.

 

[scottdave]

Ok, I see now. now.
I think I got confused by the usage. If I come across something else, I will post it.

 

[gneill]

I don't suppose there's any chance that the name is a typo? It wouldn't be much of a stretch to see "jul" become "juul".

 

[FactChecker]

Have you tried the command that is in the link that @scottdave provided?

plot(igf1~age, data=juul)

If so, did it give an error message?

What specific data command did you try and what error messages did you get?

 

[Eclair_de_XII]

It wouldn't be much of a stretch to see "jul" become "juul".

The book specifically asks: "Write the logical expression to use to extract girls between 7 and 14 years of age in the juul data set".

If so, did it give an error message?

I tried the command and it returned this message:

"Error in eval(m$data, eframe) : object 'juul' not found"

I also tried typing in >data("juul") and it returned this message:

"Warning message:
In data("juul") : data set ‘juul’ not found"I'm sure I have already installed the data package that the book tells me to install. Is it possible that those data sets no longer exist on the internet? I'm led to believe this because of some things... First, I installed the package as indicated in the book in the opening post once more. Then I tried searching my entire computer for any instances of "juul".

Then I clicked on the first result, and it takes me to this page:

It shows only a single hyperlink. I click on it, and I am taken to this website. I start scrolling around for "juul".

So I scroll down to find my database "juul". The databases in purple are likely links I've already visited and was unable to find the corresponding data set for.

So I click on that link, and this is the error message that shows up, which leads me to believe that the database in question no longer exists.

Thoughts? Sorry for all the picture-spam. Please let me know if it's disruptive, and I'll try to replace them with just links, or downsize them a bit.

 

[FactChecker]

In the first screen-shot, it looks like you tried to access the data before you installed the package. That is certain to fail. I'm not sure that I understand what happened after that. Did you try those plot and data commands after installing the package? If so, what happened?

PS. You might try juul2. That may be the replacement of juul, which may have been deleted.

 

[Eclair_de_XII]

Hm, it still doesn't work...

 

[scottdave]

Perhaps you can get what you need from the juul.csv file available for download from here (scroll down to see the CSV file links):
https://people.sc.fsu.edu/~jburkardt/datasets/iswr/iswr.html

 

[Eclair_de_XII]

Thanks. But to be honest, it seems like too much work to copy all those text files, save them, and guess which directory I put them into for R to access.

I think I want to look for a different book, one whose exercises I can do without all this hassle.

 

[FactChecker]

I think that the package has not been completely installed and loaded for use. That will be a problem no matter what book you use. See http://mazamascience.com/WorkingWithData/?p=728 and make sure that the data has been loaded for use. If you are not running as administrator, you may want to set up a personal library.

 

[StatGuy2000]

From a quick glance at R Studio, the dataset "juul" is not currently loaded into the system. You've completed part of the step by typing

install.packages("ISwR")

All you've done here is install the R package. What you then need to do is to load the package into RStudio.

To do this, you need to run the following command:

library("ISwR")

This would actually load the library package. Once that's done, then the dataset should be there, and you could then go ahead and use the plot function.