Repeated runs of my example generate different samples. How can I reproduce one run? *Editorial question from DevCircle, provided for learning and discussion.*

I want records whose score is above a threshold, excluding missing scores. *Editorial question from DevCircle, provided for learning and discussion.*

mean returns NA because some observations are missing. How can I ignore them? *Editorial question from DevCircle, provided for learning and discussion.*

I have tabular data with numeric and text columns. Which structure should I use? *Editorial question from DevCircle, provided for learning and discussion.*

I need to store values of different types without converting them all to one type. *Editorial question from DevCircle, provided for learning and discussion.*