Apologies for cross-posting.
The 2016 NHTS is underway and if you are interested in hearing about the
data collection effort, plans for the future along with understanding what
is takes to do large scale data collection and analyze the data for
transportation, health, and energy, the NHTS task force meetings, sessions,
and workshops are the place to be.
The calendar for all activities sponsored or co-sponsored by the Task Force
along with the TF meeting agenda are here:
http://rpubs.com/matungawalla/abj45T_2017AM
Look forward to seeing you all in DC.
Happy Holidays and Safe Travels,
Krishnan
We're hosting a gathering at TRB for young professionals interested in
health and transportation! See below for more information.
We hope you can join and *please* forward the information to anyone you
think might be interested in attending! Attendance at TRB is *not* required
to join for the gathering.
Thank you!
Calling all young professionals interested in health and transportation!
Working at the intersection of health and transportation can be
challenging. What careers are available in health and transportation? What
skills are necessary to succeed in this field? What's the best way to
infuse health perspectives into transportation and vice versa?
Join us at TRB on Monday, January 9th from 6-7:30 p.m.
<https://annualmeeting.mytrb.org/interactiveprogram/Details/6265> for the
initial gathering of Young Professionals in Health and Transportation. Come
meet other young professionals working in health and transportation and
discuss how we can grow and support emerging leaders in this field.
Questions? Contact Arielle Fleisher at alfleisher(a)gmail.com
**Attendance at TRB is NOT required to attend the gathering*
--
Arielle Fleisher
alfleisher(a)gmail.com
818.687.8899
Apart from my response yesterday, here are responses to Andy.
The title is deliberate and relates to the points I made yesterday.
The health effects are, as Andy says, predominantly due to physical activity and also depend on the mode these transit journeys replace -or trips not made. One study isn't generalisable but it is a good reminder to examine assumptions, such as Public transportation always increasing PA levels (not that anyone on this list believes in never or always, of course).
However, the average and range of the lengths of the journeys made, and the other options available, probably vary widely not only between countries but also within countries. London has far more buses and metro lines than anywhere else in the UK.
I am delighted that this paper is resulting in such widespread discussion!
We haven't published any Letters to the Editor yet, because we haven't received any. Feel free to submit one but perhaps take into account my comments?
Regards
Jenny
Sent from my Sony Xperia™ smartphone
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Today's Topics:
1. Re: Antwort: 'Transit Makes You Short' (mbrenman001(a)comcast.net)
2. Re: Antwort: 'Transit Makes You Short' (Sheryl Gross-Glaser)
3. Re: Antwort: 'Transit Makes You Short' (Andrew Dannenberg)
4. Re: Antwort: 'Transit Makes You Short' (ivanovb)
----------------------------------------------------------------------
Message: 1
Date: Thu, 1 Dec 2016 15:23:52 +0000 (UTC)
From: mbrenman001(a)comcast.net
Subject: Re: [H+T--Friends] Antwort: 'Transit Makes You Short'
To: "" <h+t--friends(a)chrispy.net>, "" <thomas.goetschi(a)uzh.ch>
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Date: Fri, 2 Dec 2016 10:43:29 -0500
From: Sheryl Gross-Glaser <grossglaser(a)gmail.com>
Subject: Re: [H+T--Friends] Antwort: 'Transit Makes You Short'
To: TRB Health and Transportation <h+t--friends(a)chrispy.net>
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Maybe we can match height of riders with need for petite clothing - a
business opportunity. My petite daughters would appreciate that.
On Thu, Dec 1, 2016 at 10:23 AM, <mbrenman001(a)comcast.net> wrote:
> What is "the power of large sample"? And of course correlation is not
> causality. One can imagine that in the us, transit riders are shorter than
> car driver s, because of ethnic difference s in users. And there have been
> various studies showing a correlation between height and higher pay, partly
> due to gender disparities.
> Marc brenman
>
>
> Sent from XFINITY Connect Mobile App
>
>
> -----Original Message-----
>
> From: thomas.goetschi(a)uzh.ch
> To: h+t--friends(a)chrispy.net
> Cc:
> Sent: 2016-12-01 6:48:32 AM
> Subject: [H+T--Friends] Antwort: 'Transit Makes You Short'
>
> this may have some value for a journal club - I see flaws at various
> levels. How it may contribute to our understanding of any possible
> relationship between public transport and health escapes me.
>
>
>
> Thomas G?tschi, PhD
>
> ************************************************************
> *************************
> Regelm?ssig in Z?rich unterwegs?
> Hier f?r PASTA registrieren: https://survey.pastaproject.eu/zurich
> ************************************************************
> *************************
> _____________________________________________________________
> Universit?t Z?rich
> Bewegung und Gesundheit / Physical Activity and Health
>
> Institut f?r Epidemiologie, Biostatistik und Pr?vention
>
> (eh. Institut f?r Sozial- und Pr?ventivmedizin)
>
> Seilergraben 49
>
> CH-8001 Z?rich
> Schweiz
>
> Tel: +41 44 634 50 68 <+41%2044%20634%2050%2068>
> Email: thomas.goetschi(a)uzh.ch
> www.ebpi.uzh.ch<http://www.ebpi.uzh.ch>
> _____________________________________________________________
>
> [image: Inactive hide details for Ann Hartell ---12/01/2016 12:14:34
> PM---I'm not sure how many on this list follow David Levinson's bl]Ann
> Hartell ---12/01/2016 12:14:34 PM---I'm not sure how many on this list
> follow David Levinson's blog The Transportist (over here: https:
>
> Von: Ann Hartell <ahartell(a)gmail.com>
> An: TRB Health and Transportation <h+t--friends(a)chrispy.net>
> Datum: 12/01/2016 12:14 PM
> Betreff: [H+T--Friends] 'Transit Makes You Short'
> Gesendet von: h+t--friends-bounces(a)chrispy.net
> ------------------------------
>
>
>
> I'm not sure how many on this list follow David Levinson's blog The
> Transportist (over here: *https://transportist.org/*
> <https://transportist.org/> ), but he recently published a post about a
> working paper he co-authored with Alireza Emragun titled "Transit Makes
> you Short": On Health Impact Assessment of Transportation and the Built
> Environment.
>
> The blog post is here:
>
> *https://transportist.org/2016/11/28/u-study-says-transit-does-not-have-impact-on-public-health/*
> <https://transportist.org/2016/11/28/u-study-says-transit-does-not-have-impa…>
>
> The full paper is here:
> *http://conservancy.umn.edu/handle/11299/179812*
> <http://conservancy.umn.edu/handle/11299/179812>
>
> Abstract:
> The current research provides a test framework to understand whether and
> to what extent increasing public transit use and accessibility by transit
> affect health. To this end, the effect of transit mode share and
> accessibility by transit on general health, body mass index, and height are
> investigated, while controlling for socioeconomic, demographic, and
> physical activity factors. The coefficient-p-value-sample-size chart is
> created and effect size analysis are conducted to explore whether the
> transit use is practically significant. Building on the results of the
> analysis, we found that the transit mode share and accessibility by transit
> are not practically significant, and the power of large-sample
> misrepresents the effect of transit on public health. The results, also,
> highlight the importance of data and variable selection by portraying a
> significant correlation between transit use and height in a multivariate
> regression analysis. What becomes clear from this study is that in spite of
> the mushrooming interdisciplinary studies in the nexus of transportation
> and health arena, researchers often propose short- and long-term policies
> blindly, while failing to report the inherent explanatory power of
> variables. We show that there is a thin line between false positive and
> true negative results. From the weakness of p-values perspective, further,
> we strove to alert both researchers and practitioners to the dangerous
> pitfall deriving from the power of large- samples. Building the results on
> just significance and sign of the parameter of interest is worthless,
> unless the magnitude of effect size is carefully quantified post analysis.
>
> ~~~~~~~~~~~~
> Ann Hartell
> Doctoral Candidate
> Institute for Multi-Level Governance and Development
> Wirtschaftsuniversit?t Wien/Vienna University of Economics and Business
> *https://www.wu.ac.at/en/mlgd/* <http://www.wu.ac.at/mlgd/en/>
>
> Personal: *annhartell.com* <http://annhartell.com/>
> Email: *ahartell(a)gmail.com* <ahartell(a)gmail.com>_____
> __________________________________________
> H+T--Friends mailing list
> H+T--Friends(a)chrispy.net
> https://www.chrispy.net/mailman/listinfo/h+t--friends
>
> _______________________________________________ H+T--Friends mailing list
> H+T--Friends(a)chrispy.net https://www.chrispy.net/
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>
>
>
>
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> H+T--Friends(a)chrispy.net
> https://www.chrispy.net/mailman/listinfo/h+t--friends
>
>
If you read the whole paper, it's a cautionary tale against confusing association with causation.
When an association intuitively (or because of our prejudices/preconceptions) seems correct, we ascribe greater emphasis than may be warranted. When we judge it wrong, we look for other explanations, such as residual confounding.
Although Bayesian approaches do incorporate our prior (evidence-based) beliefs, this paper is about less formal approaches to interpreting results.
Regards
Jenny Mindell
Sent from my Sony Xperia™ smartphone
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Today's Topics:
1. Re: Antwort: 'Transit Makes You Short' (mbrenman001(a)comcast.net)
----------------------------------------------------------------------
Message: 1
Date: Fri, 2 Dec 2016 17:13:09 +0000 (UTC)
From: mbrenman001(a)comcast.net
Subject: Re: [H+T--Friends] Antwort: 'Transit Makes You Short'
To: "Transportation, TRB" <h+t--friends(a)chrispy.net>
Message-ID:
<802275279.71064468.1480698789280.JavaMail.zimbra(a)comcast.net>
Content-Type: text/plain; charset="utf-8"
And the smaller the passengers, the more people can be crammed into a bus...
----- Original Message -----
From: "Sheryl Gross-Glaser" <grossglaser(a)gmail.com>
To: "TRB Health and Transportation" <h+t--friends(a)chrispy.net>
Sent: Friday, December 2, 2016 7:43:29 AM
Subject: Re: [H+T--Friends] Antwort: 'Transit Makes You Short'
Maybe we can match height of riders with need for petite clothing - a business opportunity. My petite daughters would appreciate that.
On Thu, Dec 1, 2016 at 10:23 AM, < mbrenman001(a)comcast.net > wrote:
What is "the power of large sample"? And of course correlation is not causality. One can imagine that in the us, transit riders are shorter than car driver s, because of ethnic difference s in users. And there have been various studies showing a correlation between height and higher pay, partly due to gender disparities.
Marc brenman
Sent from XFINITY Connect Mobile App
-----Original Message-----
From: thomas.goetschi(a)uzh.ch
To: h+t--friends(a)chrispy.net
Cc:
Sent: 2016-12-01 6:48:32 AM
Subject: [H+T--Friends] Antwort: 'Transit Makes You Short'
this may have some value for a journal club - I see flaws at various levels. How it may contribute to our understanding of any possible relationship between public transport and health escapes me.
Thomas G?tschi, PhD
*************************************************************************************
Regelm?ssig in Z?rich unterwegs?
Hier f?r PASTA registrieren: https://survey.pastaproject.eu/zurich
*************************************************************************************
_____________________________________________________________
Universit?t Z?rich
Bewegung und Gesundheit / Physical Activity and Health
Institut f?r Epidemiologie, Biostatistik und Pr?vention
(eh. Institut f?r Sozial- und Pr?ventivmedizin)
Seilergraben 49
CH-8001 Z?rich
Schweiz
Tel: +41 44 634 50 68
Email: thomas.goetschi(a)uzh.ch
www.ebpi.uzh.ch<http://www.ebpi.uzh.ch>
_____________________________________________________________
Ann Hartell ---12/01/2016 12:14:34 PM---I'm not sure how many on this list follow David Levinson's blog The Transportist (over here: https:
Von: Ann Hartell < ahartell(a)gmail.com >
An: TRB Health and Transportation < h+t--friends(a)chrispy.net >
Datum: 12/01/2016 12:14 PM
Betreff: [H+T--Friends] 'Transit Makes You Short'
Gesendet von: h+t--friends-bounces(a)chrispy.net
I'm not sure how many on this list follow David Levinson's blog The Transportist (over here: https://transportist.org/ ), but he recently published a post about a working paper he co-authored with Alireza Emragun titled "Transit Makes you Short": On Health Impact Assessment of Transportation and the Built Environment.
The blog post is here:
https://transportist.org/2016/11/28/u-study-says-transit-does-not-have-impa…
The full paper is here:
http://conservancy.umn.edu/handle/11299/179812
Abstract:
The current research provides a test framework to understand whether and to what extent increasing public transit use and accessibility by transit affect health. To this end, the effect of transit mode share and accessibility by transit on general health, body mass index, and height are investigated, while controlling for socioeconomic, demographic, and physical activity factors. The coefficient-p-value-sample-size chart is created and effect size analysis are conducted to explore whether the transit use is practically significant. Building on the results of the analysis, we found that the transit mode share and accessibility by transit are not practically significant, and the power of large-sample misrepresents the effect of transit on public health. The results, also, highlight the importance of data and variable selection by portraying a significant correlation between transit use and height in a multivariate regression analysis. What becomes clear from this study is that!
in spite of the mushrooming interdisciplinary studies in the nexus of transportation and health arena, researchers often propose short- and long-term policies blindly, while failing to report the inherent explanatory power of variables. We show that there is a thin line between false positive and true negative results. From the weakness of p-values perspective, further, we strove to alert both researchers and practitioners to the dangerous pitfall deriving from the power of large- samples. Building the results on just significance and sign of the parameter of interest is worthless, unless the magnitude of effect size is carefully quantified post analysis.
~~~~~~~~~~~~
Ann Hartell
Doctoral Candidate
Institute for Multi-Level Governance and Development
Wirtschaftsuniversit?t Wien/Vienna University of Economics and Business
https://www.wu.ac.at/en/mlgd/
Personal: annhartell.com
Email: ahartell(a)gmail.com _______________________________________________
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I'm not sure how many on this list follow David Levinson's blog The
Transportist (over here: https://transportist.org/ ), but he recently
published a post about a working paper he co-authored with Alireza Emragun
titled "Transit Makes you Short": On Health Impact Assessment of
Transportation and the Built Environment.
The blog post is here:
https://transportist.org/2016/11/28/u-study-says-transit-does-not-have-impa…
The full paper is here:
http://conservancy.umn.edu/handle/11299/179812
Abstract:
The current research provides a test framework to understand whether and to
what extent increasing public transit use and accessibility by transit
affect health. To this end, the effect of transit mode share and
accessibility by transit on general health, body mass index, and height are
investigated, while controlling for socioeconomic, demographic, and
physical activity factors. The coefficient-p-value-sample-size chart is
created and effect size analysis are conducted to explore whether the
transit use is practically significant. Building on the results of the
analysis, we found that the transit mode share and accessibility by transit
are not practically significant, and the power of large-sample
misrepresents the effect of transit on public health. The results, also,
highlight the importance of data and variable selection by portraying a
significant correlation between transit use and height in a multivariate
regression analysis. What becomes clear from this study is that in spite of
the mushrooming interdisciplinary studies in the nexus of transportation
and health arena, researchers often propose short- and long-term policies
blindly, while failing to report the inherent explanatory power of
variables. We show that there is a thin line between false positive and
true negative results. From the weakness of p-values perspective, further,
we strove to alert both researchers and practitioners to the dangerous
pitfall deriving from the power of large- samples. Building the results on
just significance and sign of the parameter of interest is worthless,
unless the magnitude of effect size is carefully quantified post analysis.
~~~~~~~~~~~~
Ann Hartell
Doctoral Candidate
Institute for Multi-Level Governance and Development
Wirtschaftsuniversität Wien/Vienna University of Economics and Business
https://www.wu.ac.at/en/mlgd/ <http://www.wu.ac.at/mlgd/en/>
Personal: annhartell.com
Email: ahartell(a)gmail.com