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daroczig / CEU-R-intro

Data Analysis 1a: Foundation of Data management in R @ CEU
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Question on Week 2, exercise 9 homework #13

Closed AdamSanyo88 closed 6 years ago

AdamSanyo88 commented 6 years ago

Dear Gábor,

I have some issues understanding this question in this week's homework: "The mtd object from the previous exercises is still available in your R sessions. Create a new summary data.table object called mtdgear, where you count the number of cars (stored in the cars column) and the average horsepower (stored in the avg_hp column)."

If I understand this exercise correctly, I should create a 3 by 3 data.table with the gear, cars, and avg_hp columns. Could you clarify if I'm on the right track with this approach?

Thanks, Adam

daroczig commented 6 years ago

That's right -- I've just updated the description to reflect that this is to be done by gears:

The mtd object from the previous exercises is still available in your R session. Create a new data.table object called mtdgear, where you count the number of cars (stored in the cars column) and the average horsepower (stored in the avg_hp column) per gear.

Please reopen / comment if that's still not clear.