On Fri, 22 Feb 2019 08:36:19 +1100, James
wrote:

On 22/2/19 4:13 am, Frank Krygowski wrote:
On 2/21/2019 4:24 AM, news18 wrote:
On Thu, 21 Feb 2019 11:33:58 +1100, James wrote:

Not sure if I mentioned this, but Professor Raphael Grzebieta has said
in a media release that in their as yet unpublished paper, they intend
to discredit the prior research into the health benefits of regular
cycling.

So much for the professor and his colleagues keeping an open mind,
remaining objective and following the science!

Speaking of "discrediting", has the data they collected been provided for
analysis?


Perhaps the classic regarding helmet data being provided for analysis:
When Thompson & Rivara first published their infamous helmet promoting
"85% benefit" paper in 1989, Dr. Dorothy Robinson asked for their data
set. (She used to post here, BTW.) She's a PhD statistician and
researcher in Australia.

Anyway, she was able to show that T&R's own data and techniques could be
used to "prove" that helmets prevented 75% of serious leg injuries.

For those who don't grasp the significance: She was really proving that
T&R's entire approach was faulty. Their "case" and "control" groups were
far from equivalent in matters other than helmet use. And in fact,
helmeted cyclists (mostly kids at that time) were seven times more
likely than non-helmeted ones to show up at ER.

Thompson & Rivara did not take kindly to her rebuttals. They never again
allowed her access to their data.



Dr Ian Walker from the uni of Bath tested driver interactions with
helmeted and non helmeted riders, and found that drivers drive closer to
helmeted riders.

Jake Olivier (one of the "Statisticians from the University of New South
Wales in Australia") examined the data and claimed Walker's results did
not indicate closer passing of helmeted riders.

Walker and Robinson re-crunched the numbers and have rebutted Olivier's
rebuttal!

https://forbes.com/sites/carltonreid.../#748572c05640


Olivier and Grzebieta are hell bent on proving the worth of helmets to
uphold the MHL.

See

The findings that the cars passed closer to helmeted riders in the
above reference seems to be a bit different then my own experiences,
which is not to say that conditions in Australia may not be different
:-)
https://travelhappy.info/what-you-ne...ngkok-traffic/
My experience, riding in city traffic has been that passing distances
appear to be related to traffic density. The heavier the traffic and
the slower the speeds the closer the passing distance while passing
distances on country roads seems to be more related to the speed of
the overtaking vehicle but generally more then in city traffic.


--
Cheers,
John B.