Instructor Notes
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Before we Start
Introduction to R
Starting with Data
Instructor Note
Why do we use <- instead of =?
= works for assigning values to objects. However
= is also used when we specify values of arguments in
function calls. This means that = functions differently
depending on context, whereas <- always function in the
same way. This means that we do not have to have a deeper understanding
of the context when we encounter <-. That reduces the
cognitive load, and we are stressed enough as it is.
Data Wrangling with dplyr and tidyr
A couple of plots. And making our own functions
Instructor Note
The purpose is mostly to have additional material. Introducing ggplot is probably too complicated, so we stick to the base-plotting functions.
Instructor Note
The ~ is often difficult to locate. AltGr +
¨/^ is used on most computers running Windows. We do not
encounter many Linux-users, and they tend to either know where to find
it, or are on a Windows-computer. Macs… option+¨.
Sometimes. Depending on the model.
Considder emphasizing the connection to the formula notation of
R. We are making a boxplot of imdb_score as a function of
genre.
Instructor Note
The output of the function is by default the result of the last
operation called in the function definition. Using return()
to control the output is discouraged, unless we have a function that
returns early - eg where a logical control yields different results.