1. We have added a Gift Upgrades feature that allows you to gift an account upgrade to another member, just in time for the holiday season. You can see the gift option when going to the Account Upgrades screen, or on any user profile screen.
    Dismiss Notice

[RD] Daily Graphs and Charts II: Another 10,000 to come.

Discussion in 'Off-Topic' started by Cutlass, Jun 14, 2020.

  1. Cutlass

    Cutlass The Man Who Wasn't There.

    Joined:
    Jan 13, 2008
    Messages:
    47,047
    Location:
    US of A
  2. Arakhor

    Arakhor Dremora Courtier Super Moderator

    Joined:
    Mar 27, 2009
    Messages:
    36,460
    Gender:
    Male
    Location:
    UK
    I think we've found something that doesn't immediately break down into red vs blue, right?
     
  3. Cutlass

    Cutlass The Man Who Wasn't There.

    Joined:
    Jan 13, 2008
    Messages:
    47,047
    Location:
    US of A

    The mix is definitely odder than many that you see. It's a trend partially like red blue, but with more mixing.
     
    hobbsyoyo likes this.
  4. Lohrenswald

    Lohrenswald 老任森林

    Joined:
    Mar 4, 2013
    Messages:
    6,108
    Location:
    The end
    rip thread

    here's from an experiment I did that I reported on in an exam I just did



    It's about a "car" sliding down a slope.
    X-axis says "angle [radians]" (of the slope), y-axis says acceleration. The blue one says "theoretical value" (meassuered from slope) the red one says "meassuered with stop-watch" (and length of the slope) and the yellow one says "meassured with doppler shift" (fairly complex process)

    that they don't overlap is bad and I don't know why they don't
     
    stfoskey12 and hobbsyoyo like this.
  5. hobbsyoyo

    hobbsyoyo Deity

    Joined:
    Jul 13, 2012
    Messages:
    26,549
    Red and blue can be understood as essentially overlapping, depending on the confidence levels given to the error bars of the red line. A stopwatch is going to be a pretty bad measurement technique if operated by hand, so I would expect your confidence level to be pretty low for any given measurement, meaning that it is plausible that the 'real' measurement could be at the extreme ends of the error bars rather than clustered closely to the measured data points. Another way to look at it -

    Let's say in one instance you have a computer trigger the stopwatch as the car passes. In this instance, we would still have error bars on the measurement, but we would be fairly confident that the 'real' measurement would be very close to what was actually measured rather than out on the error bar. This is because generally computers are stable and we do not expect much variation in how they measure things even as we still leave open the possibility of uncertainties.

    Now in another instance you have a person measure the car with a stopwatch. In this instance, we do not expect the person to be very precise or repeatable. In this case we would say that we have low confidence in the measurements such that we would not be surprised if the 'real' measurement was actually way out on your error bar rather than very close to the actual measurement.

    There are more formal, precise ways to explain confidence but they're beyond my understanding.

    For Doppler shift, it is again almost overlapping the predicting value except in the last measurement. In this case you could either claim there are unknown variables either in your prediction itself or in the Doppler shift measurement technique.

    I'm just spitballing though and I could be entirely wrong.
     
    SS-18 ICBM and Lohrenswald like this.
  6. Lohrenswald

    Lohrenswald 老任森林

    Joined:
    Mar 4, 2013
    Messages:
    6,108
    Location:
    The end
    That sounds pretty reasonable. And it was a person meassuring with the stop watch yea (though not me)

    I do kinda believe there were unknown variables of some kind, here's a figure for the last measurement


    x-axis says time in seconds and y-axis says velocity in m/s. The velocity is calculated by the most dominant frequency meassured at each point in time in relation to the frequency meassured when at rest. The two spikes is related in some way with the car crashing to the bottom of the slope. At this angle (which I think was a bit more than 10 degrees) it bounced up a bit which is why there are two spikes I'm pretty sure.

    Anyway the point is that we kind of expected the velocity to increase linearly from it was let go off until it crashed (because just gravity pulled it down), but as you can see the line isn't straigth
     
    hobbsyoyo likes this.
  7. hobbsyoyo

    hobbsyoyo Deity

    Joined:
    Jul 13, 2012
    Messages:
    26,549
    Oh yeah, that makes a lot of sense. Depending on how narrow your measurement device's field of view is, it can totally pick up on the velocity of a part of the car rather than the average velocity of the entire vehicle itself. So as you say, you hit a bump and the bumper flairs up a bit and the device adds that bit of bumper velocity to the vehicle's average velocity as it can't tell between the two.
     
    Lohrenswald likes this.
  8. Kyriakos

    Kyriakos Alien spiral maker

    Joined:
    Oct 15, 2003
    Messages:
    61,535
    Location:
    Thessalonike, The Byzantine Empire
    And so passes Winner, erased from the histories frontpage of CFCOT forever. Rather sad, tbh :)
     
  9. Samson

    Samson Deity

    Joined:
    Oct 24, 2003
    Messages:
    8,165
    Location:
    Cambridge

    From Nature. I am not sure who "announced" the pandemic, we have been talking about it since the new year.
     
  10. Hrothbern

    Hrothbern Deity

    Joined:
    Feb 24, 2017
    Messages:
    8,007
    Gender:
    Male
    Location:
    Amsterdam
    On March 11 the WHO declared officially that Covid-19 was a pandemy.
    As getting mustard and ketchup after you finished your meal

    The dip on the graph starts a couple of days earlier. But that still fits that the WHO did either prepare the PR to come with that statement and/or fits that the WHO was forced by newsmedia attention to declare it pandemic.
    That newsmedia surge I guess from the rapidly rising deaths in Italy.
     
    Samson likes this.
  11. Hrothbern

    Hrothbern Deity

    Joined:
    Feb 24, 2017
    Messages:
    8,007
    Gender:
    Male
    Location:
    Amsterdam
    Last edited: Jun 16, 2020
  12. gay_Aleks

    gay_Aleks communism will win.

    Joined:
    Feb 20, 2013
    Messages:
    10,825
    Location:
    Nightvale, US
    it's a bit funny, doesn't this mean there's like ~70% of the population outright disbelieving the press in the U.K
     
  13. Samson

    Samson Deity

    Joined:
    Oct 24, 2003
    Messages:
    8,165
    Location:
    Cambridge
    I think it does, from the same article, 28% of the UK says "I think you can trust most news most of the time":

    Q6_1. Please indicate your level of agreement with the following statement: I think you can trust most news most of the time.
    Base: Total sample in each market ≈ 2000, Taiwan = 1027
     
    Hakim and The_J like this.
  14. Takhisis

    Takhisis Jinping, wer fragt uns?

    Joined:
    Jul 11, 2005
    Messages:
    52,105
    Location:
    up yours.
    Disbelieving some significant sector, more likely. You have ‘sides’ one of which includes the Telegraph, Mail, Mirror, Sun, etc. while another includes the Independent and Grauniad, and so on.
     
  15. Samson

    Samson Deity

    Joined:
    Oct 24, 2003
    Messages:
    8,165
    Location:
    Cambridge
  16. Samson

    Samson Deity

    Joined:
    Oct 24, 2003
    Messages:
    8,165
    Location:
    Cambridge
    The electromagnetic spectrum, with some reference:
     
    Ferocitus, The_J and Hrothbern like this.
  17. Cutlass

    Cutlass The Man Who Wasn't There.

    Joined:
    Jan 13, 2008
    Messages:
    47,047
    Location:
    US of A
    I don't find that an easy graph to make sense of...
     
  18. Paul in Saudi

    Paul in Saudi Emperor

    Joined:
    Apr 20, 2008
    Messages:
    1,530
    Location:
    Dammam, Saudi Arabia
    9-11 victims. It is rather large.

    Spoiler for image :
     
    Last edited by a moderator: Jun 30, 2020
  19. Cutlass

    Cutlass The Man Who Wasn't There.

    Joined:
    Jan 13, 2008
    Messages:
    47,047
    Location:
    US of A
  20. Birdjaguar

    Birdjaguar Hanafubuki Super Moderator Supporter

    Joined:
    Dec 24, 2001
    Messages:
    42,404
    Location:
    Albuquerque, NM
    The Missouri-Ohio-Mississippi drainage is simple huge.
     
    hobbsyoyo and stfoskey12 like this.

Share This Page