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Questions tagged [dummy-variable]

Dummy or indicator variables are used to include categorical or qualitative variables in a regression model.

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How do I create a dummy variable in R based on a dataset's median?

My data has a median of 60. I'd like to create a dummy variable where 1 = >60 and 0 = <60.
E Bat
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Linear model in R with multiple dummies but no constant: Choice of included dummy variable levels

Consider a large panel consisting of bilateral trade data and policy dummy (levels 0 and 1, reference level 0). head(data) home partner year gdphome gdppartner exports policy Austria Albania 1988 133018182771 2126000000 8833653 …
Fusscreme
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Creating dummy variables from cells with multiple character values

I'm trying to create multiple dummy variables, based on one column called 'Tags' within my df (2 rows, 2 columns, Tags and Score. The problem is that in each cell of the column Tags there can be any number of chr values (up to about 30 values). I…
Benjamin Telkamp
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Run a within estimation with time dummies in R

I have a survey made of 13k observations: the dataset in an unbalanced panel based on a survey conducted every two years. The df is based on individual observations from 2010 to 2014. I wanted to run a two ways fixed effect regression and I used…
Laura R.
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How to add additional years to an individual/company after last observed year?

I have an unbalanced panel data set in Stata. With observations from 1993 to 2013. I have a variable named bankrupcty year which indicates the year each company went bankrupt. The problem is that my Stata file is missing up to 2 years before each…
Anne Karin Stensland
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Manage categorical variables with NA in R

I am using a national survey to run my regression. The df is based on deographic and economic variables and sometime there are missing values that R address as "NA". I have categorical variables but sometime I find problems: for example I have a…
Laura R.
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Trouble Converting a data frame into a design matrix in r

I started with R a few days ago and really could use some help :D I currently have a data.frame with 200 observations and 12 variables (they represent clicks, so they are named c1-c12). Background: A user clicks (up to 12 times) on fields. These…
sidebob
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Change default binary label in a dummy variable

I use model.matrix() method in R to generate dummy variables as: dd <- data.frame(a = gl(2,2)) model.matrix(~ a - 1,dd) Instead of 0 and 1 output labels, what parameter we need to set in model.matrix() so that output labels are -1 and 1?
Haroon Lone
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How to find observations whose dummy variable changes from 1 to 0 (and not viceversa) in a df in r

I have a survey composed of n individuals; each individual is present more than one time in the survey (panel). I have a variable pens, which is a dummy that takes value 1 if the individual invests in a complementary pension form. For example: df <-…
Laura R.
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SAS: Coding a dummy variable for a value of a variable by group within group

I have a dataset of CASE_ID (x y and z), a set of multiple dates (including duplicate dates) for each CASE_ID, and a variable VAR. I would like to create a dummy variable DUMMYVAR by group within a group whereby if VAR="C" for CASE_ID x on…
Deborah Weissner
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Tying new variable value to all responses by individual in long data

I'm using a longitudinal survey in long format, and I'm trying to create a dummy variable for if an individual has NOT got a college degree by the age of 25. My data looks something like this: ID CYRB VAR VALUE 1 1983 DEG98 1 1 …
Milhouse
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Excel Dummy Variable for R

I hope this question isn't off topic. I know how to code a dummy variable in R, however, I was wondering if I could create it in excel. Lets say I have 3 colors (red, blue, yellow) list under a color variable. R would import this as a factor with…
Danib90
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Creating Dummy Variable in R

I'm pretty new to R and I'm trying to create some new variables. Basically my dataset has individuals with a variable for mother ID (i.e. if two individuals have the same mother the value of this variable will be the same). Keeping it simple to…
Milhouse
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polycor package - hetcor error in optim

I'm trying to run a factor analysis on a set of 80 dichotomous variables (1440 cases) using the hector function from the polycor package and the instructions I found here:…
D. K.
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splitstackshape pkg - concat.split.expanded returning NA by coercion errors

I'm following the instructions here Dummy variables from a string variable to try to convert a column of strings (words separated by spaces) into dummy variables (0-1 to indicate a word being notused/used in the string in that row) using…
D. K.
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