Dummy or indicator variables are used to include categorical or qualitative variables in a regression model.
Questions tagged [dummy-variable]
868 questions
2
votes
3 answers
Decide which category to drop in pandas get_dummies()
Let's say I have the following df:
data = [{'c1':a, 'c2':x}, {'c1':b,'c2':y}, {'c1':c,'c2':z}]
df = pd.DataFrame(data)
Output:
c1 c2
0 a x
1 b y
2 c z
Now I want to use pd.get_dummies() to one hot encode the two…
TiTo
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2
votes
2 answers
Using model.matrix() to create dummy variables
the following code doesn't work, could someone offer help?
dataframe1<-data.frame(x1 = c(1:5) , x2 = 1 , x3 = 0)
dataframe1
model.matrix(~x1 - 1 , dataframe1)
Mathilda Fang
- 353
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- 13
2
votes
2 answers
Can't figure out how to remove column name from dummy variable heading
I wrote this code and used
library('fastDummies'):
New_Data <- dummy_cols(New_Curve_Data, select_columns = 'CountyName')
I just want the actual county name that is Banks to be displayed and not CountyName_Banks etc.
There are like 100 dummy…
Eena29
- 23
- 2
2
votes
1 answer
How can I modify this code chunk to recode all ~400 variables in my dataframe and not just one?
I wrote this in R to dummy code a character variable that consists of either "0" or a character response (like "sh6sej"), so that all character responses go to 1 and all 0's go to 0. It works fine for the one variable.
However, is there a way to…
moomin_valley
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- 4
2
votes
2 answers
Create Dummy Columns for values in Single Pandas Column and Group into single row
I am trying to take a pandas dataframe and perform a pivot like operation on a single column. I want to take multiple rows (grouped by some identification columns) and convert that single column into dummy indicator variables. I know of…
Coldchain9
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- 31
2
votes
2 answers
Efficiently reshaping a non-standard dummy-coded matrix or table in R
I have a data frame that has several hundred thousand rows and 6 columns. Each column contains IDs (there are about 500 unique IDs in total). I would like to convert this data frame into a large table/matrix with each unique ID having its own…
donkeyshark
- 111
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2
votes
2 answers
Lasso Regression coefficients to find a linear model
I am doing linear models in R. My factors include birth rates, death rates, infant mortality rates, life expectancies, and region. region has 7 levels, using numerical numbers to represent each region:
East Asia & Pacific
South Asia
Europe &…
user14622762
2
votes
1 answer
How to create dummy variable based on the value of two columns in R?
The question title might not completely reflect my problem, and that's perhaps the reason why I cannot come up with a solution for my problem. I have read simmilar questions (e.g., Assign a value to column based on condition across rows or R:…
2
votes
1 answer
Creating a dummy variable and data wrangling
I have a dataframe that looks like this:
I need to create a new dataframe in which the student names are the index, the course number is the columns and the values are 0 or 1, depending on whether or not the student took that course.
I have tried…
Sofia
- 31
- 2
2
votes
1 answer
GNUPLOT - problems with "set dummy"
Hey i want to plot some functions but have problems with my dummy variables. Everytime i want to plot my second graphic gnuplot says that dummy M or x is not defined but i don't know why. Its not neccesary to have different dummy variables but it…
iPhil
- 33
- 3
2
votes
2 answers
Change structure of DF to dummy
I am looking for a way of changing structure of DF so I can use beta regression after. The df looks like this at the moment:
rating playerID
0.6 a1
NA b2
0.9 a4
NA b5
0 a3
NA …
K-tan
- 79
- 8
2
votes
1 answer
R Quantreg: Singularity with categorical survey data
For my Bachelor's thesis I am trying to apply a linear median regression model on constant sum data from a survey (see formula from A.Blass (2008)). It is an attempt to recreate the probability elicitation approach proposed by A. Blass et al (2008)…
C. Schrijver
- 23
- 3
2
votes
3 answers
Create numerically encoded dummy variables efficiently in R?
How can we transform data of the form
df <- structure(list(customer_number = c(3, 3, 1, 1, 3),
item = c("milkshake","burger", "apple", "burger", "water")
),
row.names = c(NA, -5L), class…
stevec
- 41,291
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2
votes
2 answers
creating dummy quantile variable from continuous variable
Here is the data I am working with:
x <- getURL("https://raw.githubusercontent.com/dothemathonthatone/maps/master/testmain.csv")
data <- read.csv(text = x)
I want to make a dummy variable for the top, middle, and lower third of the values in…
Collective Action
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2
votes
1 answer
Relevel factor and glm with effect coding
I'm having trouble understanding effect coding with glm. As an example:
data('mpg')
mpg$trans = as.factor(mpg$trans)
levels(mpg$trans)
[1] "auto(av)" "auto(l3)" "auto(l4)" "auto(l5)" "auto(l6)" "auto(s4)" "auto(s5)" "auto(s6)" …
W. Mooi
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