This recurring thread will be for general discussion on whatever math-related topics you have been or will be working on this week. This can be anything, including:
- math-related arts and crafts,
- what you've been learning in class,
- books/papers you're reading,
- preparing for a conference,
- giving a talk.
All types and levels of mathematics are welcomed!
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Background: over the course of iCarly, Carly Shay has gone through multiple boyfriends and love interests, as evidenced by this video. She's broken up with many people too, as evidenced here. Reading the comments, however, leads to horrifying insights.
"Carly is so shallow"
"Carly clearly has a type, and they all look like Freddie"
Now, this is the insight that any introductory economics student would make. This is a simple regression, perhaps logistic, of the probability of Carly dating a guy on a vector of his characteristics: hair color, height, muscle size, hobbies, talents, the number of competitors you have on the dating market, et cetera. However, this analysis is insufficient for gleaning the proper mechanisms behind why Carly dates whom she dates. Even if we add a lot of controls (and have enough data to avoid collinearity), instrument to fix reverse causality (the potential of dating Carly causes guys to change their characteristics), all we get are treatment effects: we don't have structural insights into why Carly chooses and breaks up with the guys she does, because those internal motivations are unobservable to the econometrician.
Dating is a dynamic decision-making process, and in our econometric analysis, we need to take that into account. Guiding our econometrics using economic theory will let us take account of Carly's aforementioned unobservable motivations. So let us proceed.
In each period t, Carly has two actions: she can choose to date a guy or not. Her action a gives her, in each period, utility U, which is composed of two additively separated components: u and epsilon.
u is a "direct" utility function that is affected by the characteristics of the guy she dates (assuming that she chooses to date him), the number of times she has dated him, and the utility parameters she places on those characteristics. The characteristics are represented by e, the parameters are represented by theta, and n is the number of times she has dated the guy in the past.
Epsilon are Type 1 Extreme Value, i.i.d. utility shocks in each period. There are epsilon shocks for when Carly chooses to date guys of certain characteristics, and epsilon shocks for when she chooses not to date. We normalize u = 0 when she chooses not to date.
All-in-all, during the dating process, this is what her utility looks like.
... keep reading on reddit ➡Phil
Sudden Lee
Go post NSFW jokes somewhere else. If I can't tell my kids this joke, then it is not a DAD JOKE.
If you feel it's appropriate to share NSFW jokes with your kids, that's on you. But a real, true dad joke should work for anyone's kid.
Mods... If you exist... Please, stop this madness. Rule #6 should simply not allow NSFW or (wtf) NSFL tags. Also, remember that MINORS browse this subreddit too? Why put that in rule #6, then allow NSFW???
Please consider changing rule #6. I love this sub, but the recent influx of NSFW tagged posts that get all the upvotes, just seem wrong when there are good solid DAD jokes being overlooked because of them.
Thank you,
A Dad.
Because a toothbrush works better
So far nobody has given me a straight answer
I am currently in the hospital. I had a back operation yesterday. The surgical nurse came in my room and started asking questions about my back. She asked me if I had any falls during the last year. I responded just one. It was after summer.
She laughed and said in 20 years of doing this she never was told that joke.
Indian places are naan profit, Vietnamese places are pho profit.
..... Will get a reward.
The Bushes
Because they work on many levels
Well, toucan play at that game.
Me : For starters, I bring a lot to the table
Argon does not react.
Windows
Martin Freeman, and Andy Serkis.
They also play roles in Lord of the Rings.
I guess that makes them the Tolkien white guys.
She said apple-lutely
I want to talk about my father and the wonderful influence he has had on my life,' he told the audience. 'He is a shining example of parenthood, and I love him more than words could ever do justice.'
At this point he seemed to struggle for words. After a pause, he looked up with a sly grin and said, 'Sorry, but it's really hard to read my father’s handwriting.'
This happened a few years ago when my son was 6ish. When my kids hurt themselves and it doesn’t look serious I always do the “we might have to amputate that bruised hand” shtick with them. I’ve done it enough that they now roll their eyes.
So, my son got hit lightly in the face with a rubber ball. It wasn’t a hard hit and I could tell he was more upset by the shock of it rather than the pain. So I say “looks like we will have to amputate your nose.” To which he replies “then how will I smell?” And I say “terrible!”
It was my greatest dad joke ever. I felt like I could retire after that.
I’d have $8.40
'Eye-do'
This is my first post pls don't kill me lol.
The people in the comment section is why I love this subreddit!!
Cred once again my sis wants credit lol
Keep in mind, my son is 4 years old, so everything is an original to him.
I had to work late into the evening yesterday, and he was just going to bed when I got home. I had left home for the office nearly 14 hours prior, had a long day, lots of meetings, traffic, etc.
When I walked through the door, I was exhausted, run down, and starving. My wife hugged me and asked how my day was, and I replied, "Done. It was a good day, but has got me exhausted. I just want to grab a bite and go to bed. I'm hungry."
From my son's bedroom, I hear him shout, "Hi Hungry! Nice to meet you!"
Not only did it make me laugh, but I completely forgot about how hungry and tired I was. I went to his bedroom, and we laughed together about it. It was exactly what I needed.
Edit: Thanks for all the awards, kind strangers! I'll let my son know y'all enjoyed his joke too!
I heard parents named their children lance a lot.
First post please don't kill me
Edit: i went to sleep and now my inbox is dead, thank you kind strangers for the awards!
To get to the... Bottom...
(as told by my 5yo son, I'm so proud)
Japan.
Now, I'm living in a flat.
Hi /r/mathhelp,
I'm learning about the parametric vector form of a line and am just wondering about the rules around scaling the direction vector.
For example, I was given the problem to convert
3x + 2y = 6
to parametric vector form.
My answer was
x = <0, 3> + lambda<1, -3/2>
The given answer is
<0, 3> + lambda<2, -3>
Now I can see that the given answer is the same as mine with the direction vector scaled by 2. Is this allowed because scaling of the direction vector doesn't actually change the line produced by the equation (e.g. both lines are still collinear)?
I used the method of subbing in x for lambda in this case. If I selected y = lambda instead I'd get the vector
x = <2, 0> + lambda<-2/3, 1>
Is this an equivalent answer and if so is there an intuitive way for me to understand / see that it is?
Thanks
"No, the regular kind!" I laughed.
second hand stores!
it's Hans free now..
