Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I'm trying to forecast the daily electricity market price, with a dataset of 3 years before of daily prices, and we want to correct some seasonal effect because we cannot predict the prices, we want to do a dummy to diferentiate everyday of the week, like everymonday, everytuesday and so on.
Can someone explain me how to make dummies in R in order to diferentiate the days on the week? Thank you so much.
You don't have to do that, in R, you can use as. You may also want to check how to treat dates in R , for instance, you can extract the day of the week using weekdays :.
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In R it is seldom the case the you need to compute standalone derived variables for models. Dummies are create automatically when a factor variable is included in a model formula.
Simple transformations are made symbolically in a formula.
So to answer your question, depending on the modeling functions you are using, create a factor variable for day of the week. For long-term time effects things like regression splines or periodic splines are often helpful. Learn more.
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