Loop by group in a variable and selecting by conditional
Hello, I must select the families "family" that meet the condition of having children. base example (see image 1) Array
For this I must 1. make a cycle for each family 2. create a new column that selects those families that have children "Est_post_98" (see image 2) Array
3. Eliminate Families that do not have children (see image 3) Array Could someone help me, I have tried foreach but I could not
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