Creating a count of a string variable by a categorical variable

General
1

Hi all,

Trying to create a count of two categorical variables (total cases) for a linear model- dataset looks like below:

var1 weeks
positive week1
positive week1
positive week1
negative week1
positive week2
positive week2
positive week2
positive week3

I want to eventually create a linear regression of positives/ negatives by week, so

model <- lm(weeks ~ totalcases (sum of all var1), data = df)

2

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