Q&A
Q: I had a question about the presentations for the final projects; since it is due during finals week, is it a live presentation in class or do we submit a video? If it is a live presentation, do we present during our designated final day/time on webreg?
A: Video submission!
Q: I also wanted to mention that the mid/pre-course extra credit surveys doesn’t reflect a change in grade on canvas. (For ex. if i put a 0 or 100 for E.C my grade stays the same).
A: Correct - I add these in at the end. Canvas can do many things, but it doesn’t handle EC well (from what I can tell).
Q: I’m overwhelmed/confused by “the code :’) it’s quite a bit to take in”
A: Yes! It’s a lot! This is why we have group mates on the case study. I encourage everyone to sit with the code after class and then work through it together as you complete the case study!
Q: For oral fluid you mentioned looking more into why there’s that big dip in specificity and that we should look more into that on Friday with eda but would that be slightly guided because I have no idea where to start with that.
A: I would make some plots that specifically look at the data/numbers there to figure out what could be leading to that drop at that particular time window.
Q: Why are specificity graphs so high? A: Good question - this is generally b/c people who didn’t smoke have values very close to zero across compounds…so they will rarely be above the cutoff, making this very effective at identifying individuals who did not smoke
Q: What is the dplyr::select notation, like is it a way to use select from dplyr without librarying first?
A: Yes!
Q: Also separate topic, but do we have information on impairment so we can account for that with recent use? A: Great question - impairment is very hard to define here. We (the researchers) have data on self-reported high and what the police officers determined, but y’all don’t have that data. So, we’re using knowledge from other studies (see 11-cs01-data notes) to understand what we know on impoairment but only focusing on detecting recent use here.
Q: I am unable to locate where to sign up for groups for the final project
A: This form was just released (sorry for delay). link to survey
Q: I think I need more time to digest how the code works together to produce the visuals that we saw.
A: I agree. I think I could balance and give more time in class…but I will say this is an exercise I want groups to work through together!
