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Questions - dummy-variable

Why does ppmlhdfe give different results for manually interacted variables?

I am running a regression using ppmlhdfe with two dummy variables and the interaction between them. This is constructed as follows: gen interaction = D1*D2 ppmlhdfe y D1#D2 control i.year, vce(robust...
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Pia

regression

stata

interaction

dummy-variable

Votes: 0

Answers: 1

Latest Answer

Following advice received on Statalist by Jeff Wooldridge and Carlo Lazzaro I tried ppmlhdfe trunk high_price##foreign headroom, vce(robust) and ppmlhdfe trunk high_price c.high_price#c.foreign forei...
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Pia

Creating a conditional dummy variable column in R

I'm working with a cross-country panel dataset, one of my variables (cc_dummy) takes the value of 1 & 0 (there are also missing values indicated by NAs). I want to create a new column such that if...
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user3227641

r

dataframe

dplyr

conditional-formatting

dummy-variable

Votes: 0

Answers: 1

Latest Answer

Here's a way to do it using data.table::rleid and dplyr grammar: library(dplyr) df %>% group_by(country, m = data.table::rleid(cc_dummy)) %>% mutate(newcol = ifelse(n() >= 3 & cumsu...
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Maël

Variable Importance Dummy Variables R

How can I determine variable importance (vip package in r) for categorical predictors when they have been one-hot encoded? It seems impossible for r to do this when the model is built on the dummy var...
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mapleleaf

r

feature-selection

dummy-variable

Votes: 0

Answers: 1

Latest Answer

From the caret documentation, we see that variable importance in linear models corresponds to the absolute value of the t-statistic for each covariate. So, we can manually compute it, as I do in the c...
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riccardo-df

Trying to generate a dummy variable based on a range of data and one cell

I have a dataset that consists of two Date columns. Both of the date columns are in reference to different events happening. I want to generate a dummy variable that equals 1 if both of the dates and ...
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Ronan Dunne

r

date

dummy-variable

Votes: 0

Answers: 1

Latest Answer

From your description, I think your columns are datetime and not just dates, correct? It’s an important distinction to make because dates and datetimes are separate classes in R. It’s also helpful if ...
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