Merge pull request #208 from hneth/master

Minor

vignettes/guide.Rmd

@@ -47,11 +47,17 @@ url_JDM_html  <- "https://journal.sjdm.org/17/17217/jdm17217.html"
 url_JDM_pdf   <- "https://journal.sjdm.org/17/17217/jdm17217.pdf"
 
 url_JDM_doi <- "https://doi.org/10.1017/S1930297500006239"
+doi_JDM     <- "10.1017/S1930297500006239"
 
 email_contact <- "Nathaniel.D.Phillips.is@gmail.com"
 url_contact   <- "https://www.linkedin.com/in/nathanieldphillips/"
 ```
 
+<!-- FFTrees logo: --->
+
+<!-- <img src = "../inst/logo.png" align = "right" alt = "FFTrees" width = "160" /> -->
+
+
 <!-- Brief intro: -->
 
 The R package **FFTrees** [@phillips2017FFTrees; @FFTrees-pkg] makes it easy to create, visualize, and evaluate fast-and-frugal decision trees\ (FFTs). 
@@ -215,7 +221,7 @@ For an accessible introduction to FFTs, we recommend reading our article in the
 - Phillips, N. D., Neth, H., Woike, J. K. & Gaissmaier, W. (2017). 
 FFTrees: A toolbox to create, visualize, and evaluate fast-and-frugal decision trees. 
 _Judgment and Decision Making_, _12_ (4), 344–368. 
-doi\ [10.1017/S1930297500006239](`r url_JDM_doi`) 
+doi\ [`r doi_JDM`](`r url_JDM_doi`) 
 
 <!-- PDF available at `r url_JDM_pdf` -->