This was my soapbox FB post to family...

2,441 Views | 11 Replies | Last: 5 yr ago by AggieBaseball06
jetescamilla
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... who are still attending birthday parties and going to social gatherings. My grandparents I was told are isolating home but family who still work or go out into groups are still "visiting and checking" on them not realizing how this virus spreads. If you feel it it's useful pir like my graphs feel free to share.

Quote:

Disclaimer: I'm not a virologist or microbilogist, I'm just and engineer who likes numbers and graphs.

I guess I'll get on my soapbox once again and give a graphical update of what I've been tracking regarding COVID-19. Rember, on my last update on the 13th the US only had about 2,000 confirmed cases. At that time Italy seemed an apocalyptic country that didn't have it together to keep their healthcare system from being overwhelmed. I mentioned exponential growth and the scary effects of it. Let's see how we've progressed since then...

The 1st graph shows the # of confirmed COVID 19 cases in real time. The US is the "baby blue" curve on the bottom that takes a very sharp upward turn and is now in 2nd place as of today on my graph. USA! USA! USA! oh wait...that's not a good thing right? Watch out Italy, we're coming for you.

On the 2nd and 3rd graphs I've moved the countries I'm tracking to start "day 0" when each respective country hit 100 confirmed cases. These graphs would show how quickly the virus spread from that point forward. Now we can compare timeline "apples to apples".

In the 2nd graph can you see the curve that starts off low then shoot up to be the quickest to surpass 20,000 active cases? USA, USA, USA! Suck it Italy! Again, not a good thing. Actually, it's really scary. We're still growing on a 1.35 to 1.4 daily multiplier. This is EXPONENTIAL GROWTH, compounding interest. Daily compounding interest with a rate of 35%. Perhaps that was how it was explained to Trump to finally get him on the bandwagon. If this exponential growth rate continues on at the same rate by next week we'll have 200,000 confirmed cases and a hospital system that is just as jammed as Italy.

The 3rd graph is the same as the 2nd except it is in a "log scale" the numbers on the vertical axis are magnitudes of 10 greater than the one below. 1, 10, 100, 1000, etc. This is how earthquakes are measured, a 7.0 is actually 10x's stronger than a 6.0 and 100x's stronger than a 5.0, did you know that? The beauty of log graphs are that exponential curves become straight lines now. The slope of the curve (rise/run) shows you how fast your growth rate is. Would you like to guess who has the steepest curve at this point? I'll give you a hint..usa, usa, usa. Want to know a new scary trend that shows up here? Our line is still very linear (straight). There is no curve down yet. We still have the same exponential growth. Other countries are starting to flatten out, even Italy. Don't worry, we'll probably catch up to them in total number soon. USA, am I right?!








LoneStarAg10
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Ok, now divide those numbers by population of country and regraph. Please and thank you.
jvanbeek
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I calculated that over 99.995% have not been tested positive for COVID-19.
Jim VanBeek '85, '99
TXAggie2011
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AGS10TAK said:

Ok, now divide those numbers by population of country and regraph. Please and thank you.
What's your point? That this isn't a big deal? Or what?

That logarithmic scale is important. Exponential growth can pop out of control real fast.
combat wombat™
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Have you had a talk with your grandparents regarding who they should allow into their home to check on them?
pocketrockets06
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You realize this betrays some math ignorance, right? When graphing on a log scale, normalizing for the population size only changes the intercept not the slope of the line.


rate = n/N ( cases divided by population)
log(rate) = log(n/N)
= log(n) - log(N)
jetescamilla
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AGS10TAK said:

Ok, now divide those numbers by population of country and regraph. Please and thank you.


Sure, we have more people. Here's the thing, every 8 days we're crossing one of those horizontal lines. Each of those lines is 10x's the one below. I understand it can't stay linear forever, but I would have hoped that we'd be seeing a downward trend. Pretty scary how straight it still is. Believe me, I'd rather be wrong than right with how large this could become. If you don't look at those graphs and think there's some serious potential for bad things then your heads still in the sand.

As of right now we have another 8400 confirmed cases. By the end of the day we're still tending the same.
jetescamilla
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combat wombat said:

Have you had a talk with your grandparents regarding who they should allow into their home to check on them?


I have. They or some of my family members don't really comprehend the severity or potential. Just today more photos of a large portion of them were at a quinceanera and then some of the relatives went to "check on my grandparent". Mexicans, am I right? :/
Shooz in Katy
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pocketrockets06 said:

You realize this betrays some math ignorance, right? When graphing on a log scale, normalizing for the population size only changes the intercept not the slope of the line.
.

rate = n/N ( cases divided by population)
log(rate) = log(n/N)
= log(n) - log(N)


Portrays
pocketrockets06
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Betrays is correct (portrays could also work).

https://www.quora.com/Whats-the-use-of-this-phrase-to-betray-ones-ignorance-What-does-it-mean

Shooz in Katy
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pocketrockets06 said:

Betrays is correct (portrays could also work).

https://www.quora.com/Whats-the-use-of-this-phrase-to-betray-ones-ignorance-What-does-it-mean




Well I'll be damned. It's still a double negative in my book though.
djmeen95
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Exponential growth is hard for folks to comprehend. Easy to laugh at early. But when the numbers catch up, all hell breaks loose.

https://tasks.illustrativemathematics.org/content-standards/tasks/533

AggieBaseball06
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I was a liberal arts major so I beg forgiveness in advance- my math skills aren't on par with a lot of TexAgs.

But didn't they tell us we would see a huge uptick in cases as testing capabilities improved? And due to the long incubation period of covid, isn't it supposed to be about 2 weeks before we see positive results of some sort? I feel like quarantines didn't really start until 10 days ago or so and a lot of people didn't get serious about it until a week ago. So in the next 4-7 days, we should start to see this graph calm down a bit in theory...
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