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What does factor function do in R?
Factors in R are stored as a vector of integer values with a corresponding set of character values to use when the factor is displayed. The factor function is used to create a factor. The only required argument to factor is a vector of values which will be returned as a vector of factor values.
What is strings as factors in Rstudio?
In summary, strings are read by default as factors (i.e. distinct groups). This has two consequences: Your data is stored more efficiently, because each unique string gets a number and whenever it’s used in your data frame you can store its numerical value (which is much smaller in size)
How do you factor variables in R?
To create a factor in R, you use the factor() function. The first three arguments of factor() warrant some exploration: x: The input vector that you want to turn into a factor. levels: An optional vector of the values that x might have taken.
How do you order a factor in R?
One way to change the level order is to use factor() on the factor and specify the order directly. In this example, the function ordered() could be used instead of factor() . Another way to change the order is to use relevel() to make a particular level first in the list.
What does stringsasfactors in Your Mean in base R?
One more thing to keep in mind is that while base data import functions (like read.csv and read.table) convert strings to factors by default, tidyverse functions (like read_csv from the readr package or read_excel from the readxl package) do not. With base R functions, to avoid conversion of strings to factors you would do, for example:
How are strings converted to factors in stringsasfactors?
Thus, when reading in such data files, strings are always converted to factors. As this conversion was always performed, irrespective of the stringsAsFactors settings, it will remain, but get modified to always use the C sort order in the conversions, to the effect that loading such data sets will become locale-independent.
When did stringsasfactors become default in your 2.4?
In R 2.4.0 (released 2006), data.frame () and read.table () gained a stringsAsFactors argument, defaulting to default.stringsAsFactors () , which in turn would use the stringsAsFactors option if set, and otherwise give TRUE by default.
How does stringsasfactors in data.frame ( ) work?
Looking at the usage section of sqlGetResults (on the same help page) you will find that there is an argument stringsAsFactors which uses the following default: Not the answer you’re looking for? Browse other questions tagged r dataframe or ask your own question.