OK... Now we have a Spreadsheet supporting a Bar Graph. I suppose Next it will be a Pie Chart to support the Spreadsheet?
LOL. But my 1st Question still Hasn't been answered.
"How,
exactly, is "Prevalence of Vaping" quantitatively defined?"
I, fortunately, know where the Data came from...
"METHODS
Data for this study come from the annual Monitoring the Future (MTF) study, a nationallyrepresentative sample of students in the contiguous U.S. States. Personnel from the University of Michigan administered the surveys in classrooms throughout the U.S., and students selfcompleted questionnaires during a normal class period. The project has been approved by the University of Michigan Institutional Review Board. Data for this study come from independent samples of 12th, 10th, and 8th grade students surveyed in 2017 and 2018. Overall student response rates for these two years were 80% in 12th grade, 85% in 10th grade, and 88% in 8th grade. The great majority of non-response was due to student absence. For a detailed description of the survey methodology see Bachman et al."
https://www.nejm.org/doi/suppl/10.1056/NEJMc1814130/suppl_file/nejmc1814130_appendix.pdf
And I know how the Percentiles were calculated...
Vaping Measures Introduction to all vaping questions:
“To ‘vape’ is to use a device such as a vape-pen, an e-cigarette, an e-hookah, or e-vaporizer to inhale a mist or vapor into the lungs. Have you ever vaped?” Youth who report ever vaping are then asked the following questions on substance vaped. Vaped Nicotine On how many occasions (if any) have you vaped NICOTINE during the last 30 days? Coded 0 for response of “0” and 1 for response of “1-2” 3-5” 6-9” “20-30” or “40 or more” Vaped Just Flavoring On how many occasions (if any) have you vaped just FLAVORING, without any nicotine or marijuana in it during the last 30 days? Coded 0 for response of “0” and 1 for response of “1-2” 3-5” 6-9” “20-30” or “40 or more” Vaped Nicotine or Flavoring Coded 1 if either of the two above measures are coded 1, and 0 if both measures are 0.
https://www.nejm.org/doi/suppl/10.1056/NEJMc1814130/suppl_file/nejmc1814130_appendix.pdf
And it is in the Calculation that I have Issues/Concerns.
Because let me ask you this...
Does an Individual who takes 2 Hits on an e-Cigarettes and then Never vapes again receive the weighting as an Individual who vapes a Pod a Day?
Doesn't Everyone end up in that 20.9 Percentile? Regardless of Amount Used. And Regardless if they merely Tried an e-Cigarette once and No Longer use one. Or if they are Burning thru $300/Month in Vape Carts?
The Bar Graph above Isn't Necessarily Wrong. But it Presents a Very Distorted Representation as to what is Actually going on.
Because Clearly there is a Difference between someone who Tries something out of Curiosity or Peer Pressure, and than does Not Continue to use it. And someone who is 24/7 365 user of a Product.
But the Above Bar Graph does Quantify this. And Allows the Reader to draw their Own Conclusions. Which is a Fundamentally Flawed use of Statistics. Unless the Intent was to Deceive and or Inflate a result.
Look, I know you have a Thing about JUUL. Because you seem to run Lots of Threads Slamming them. And that OK. You are Entitled to your Opinion.
I just Don't like the use of Deceptive or Misleading "Statistical Methods". And I wish More people would Pull Back the Curtain sometimes when people present them with a Naked Statistic.
Because a Naked Statistic tell you Absolutely Nothing. And can be Used for about any means. Be them Good. Or be them Misleading.