On Sun, 10 Sep 2017 08:27:12 +0100
Someone Somewhere wrote:
On 09/09/2017 19:12, Graeme Wall wrote:
SMS initially.


It can be SMS, it could even be electronic billboards or display
screens. Imagine walking on to a tube platform, to be greeted by a
display with an advert from Boots - "Hey Someone Somewhere - you haven't
bought Preparation H recently. If your arse grapes are still troubling
you, you'll be pleased to know that we currently have 50p off our jumbo
tube" or similar....

Of course there is always the option - possibly heresy for Millenials - to
switch off wifi on your phone. I know, its radical, but it might just work.

--
Spud

In message , at 13:43:05 on Mon, 11 Sep
2017, d remarked:
It can be SMS, it could even be electronic billboards or display
screens. Imagine walking on to a tube platform, to be greeted by a
display with an advert from Boots - "Hey Someone Somewhere - you haven't
bought Preparation H recently. If your arse grapes are still troubling
you, you'll be pleased to know that we currently have 50p off our jumbo
tube" or similar....

Of course there is always the option - possibly heresy for Millenials - to
switch off wifi on your phone. I know, its radical, but it might just work.

You've raised a *very* interesting point. This survey may be of only
that self-selecting subset of passengers who *do* keep their wifi on [on
the tube].

Does the associated article mention whether they attempted to correct
for this built-in bias?
--
Roland Perry

On 11/09/2017 14:53, Roland Perry wrote:
In message , at 13:43:05 on Mon, 11 Sep
2017, d remarked:
It can be SMS,Â* it could even be electronic billboards or display
screens.Â* Imagine walking on to a tube platform, to be greeted by a
display with an advert from Boots - "Hey Someone Somewhere - you haven't
bought Preparation H recently.Â* If your arse grapes are still troubling
you, you'll be pleased to know that we currently have 50p off our jumbo
tube" or similar....

Of course there is always the option - possibly heresy for Millenials
- to
switch off wifi on your phone. I know, its radical, but it might just
work.

You've raised a *very* interesting point. This survey may be of only
that self-selecting subset of passengers who *do* keep their wifi on [on
the tube].

Does the associated article mention whether they attempted to correct
for this built-in bias?

Are you presuming that there is a correlation between whether people
keep wifi on and choose particular routes? If we assume they are
independent then TfLs analysis still stands.

Presumably by analysing ticket data we can see what percentage of
passengers are carrying a device with wi-fi enabled (although in my case
that is often 3 or more - before you ask, personal phone, work phone and
kindle)

In message , at 15:16:32 on Mon, 11 Sep
2017, Someone Somewhere remarked:
On 11/09/2017 14:53, Roland Perry wrote:
In message , at 13:43:05 on Mon, 11 Sep
2017, d remarked:
It can be SMS,* it could even be electronic billboards or display
screens.* Imagine walking on to a tube platform, to be greeted by a
display with an advert from Boots - "Hey Someone Somewhere - you haven't
bought Preparation H recently.* If your arse grapes are still troubling
you, you'll be pleased to know that we currently have 50p off our jumbo
tube" or similar....

Of course there is always the option - possibly heresy for
Millenials - to
switch off wifi on your phone. I know, its radical, but it might
just work.
You've raised a *very* interesting point. This survey may be of only
that self-selecting subset of passengers who *do* keep their wifi on
[on the tube].
Does the associated article mention whether they attempted to
correct for this built-in bias?

Are you presuming that there is a correlation between whether people
keep wifi on and choose particular routes? If we assume they are
independent then TfLs analysis still stands.

Actuall, it's worse than that, because different types of traveller
might have smartphones or not, at all. Older passengers might have fewer
phones/device, and might make decisions based more on step-free or long
term habit, than short term optimisation. Conversely, younger people in
a hurry, with more devices, might bail out to alternative less obvious
routes more impatiently.

Presumably by analysing ticket data

You might be able to make a stab by comparing the number of ticket
barrier entries/exits at a non-interchange station or two, then the
number of unique phones you detect on the platforms.

we can see what percentage of passengers are carrying a device with
wi-fi enabled (although in my case that is often 3 or more - before you
ask, personal phone, work phone and kindle)

Well, that's going to bias the results too, because you'll perhaps show
up as three trips not one. And maybe people with lots of devices are
more prone to be fussy about choosing the quickest route.
--
Roland Perry

On Mon, 11 Sep 2017 15:16:32 +0100
Someone Somewhere wrote:
On 11/09/2017 14:53, Roland Perry wrote:
Does the associated article mention whether they attempted to correct
for this built-in bias?

Are you presuming that there is a correlation between whether people
keep wifi on and choose particular routes? If we assume they are
independent then TfLs analysis still stands.

Presumably by analysing ticket data we can see what percentage of
passengers are carrying a device with wi-fi enabled (although in my case
that is often 3 or more - before you ask, personal phone, work phone and
kindle)

You have to carry a work phone? You have my sympathies. There's nothing worse
than the invisible leesh tying you to the office when its not really required
by the job (ie you're not a travelling salesman or on site engineer etc).

--
Spud

On Tue, 12 Sep 2017 08:35:41 +0000 (UTC), d wrote:

On Mon, 11 Sep 2017 15:16:32 +0100
Someone Somewhere wrote:
On 11/09/2017 14:53, Roland Perry wrote:
Does the associated article mention whether they attempted to correct
for this built-in bias?

Are you presuming that there is a correlation between whether people
keep wifi on and choose particular routes? If we assume they are
independent then TfLs analysis still stands.

Presumably by analysing ticket data we can see what percentage of
passengers are carrying a device with wi-fi enabled (although in my case
that is often 3 or more - before you ask, personal phone, work phone and
kindle)

You have to carry a work phone? You have my sympathies. There's nothing worse
than the invisible leesh tying you to the office

Sheesh! My dog would tell you he's mostly on a leash.

How many spills can a spellchucker check?

On Tue, 12 Sep 2017 16:23:53 -0700
Nobody wrote:
On Tue, 12 Sep 2017 08:35:41 +0000 (UTC), d wrote:

On Mon, 11 Sep 2017 15:16:32 +0100
Someone Somewhere wrote:
On 11/09/2017 14:53, Roland Perry wrote:
Does the associated article mention whether they attempted to correct
for this built-in bias?

Are you presuming that there is a correlation between whether people
keep wifi on and choose particular routes? If we assume they are
independent then TfLs analysis still stands.

Presumably by analysing ticket data we can see what percentage of
passengers are carrying a device with wi-fi enabled (although in my case
that is often 3 or more - before you ask, personal phone, work phone and
kindle)

You have to carry a work phone? You have my sympathies. There's nothing worse
than the invisible leesh tying you to the office

Sheesh! My dog would tell you he's mostly on a leash.

How many spills can a spellchucker check?

You're confusing me with someone who gives a ****.

--
Spud

On 13/09/2017 09:35, d wrote:
On Tue, 12 Sep 2017 16:23:53 -0700
Nobody wrote:
On Tue, 12 Sep 2017 08:35:41 +0000 (UTC), d wrote:

On Mon, 11 Sep 2017 15:16:32 +0100
Someone Somewhere wrote:
On 11/09/2017 14:53, Roland Perry wrote:
Does the associated article mention whether they attempted to correct
for this built-in bias?

Are you presuming that there is a correlation between whether people
keep wifi on and choose particular routes? If we assume they are
independent then TfLs analysis still stands.

Presumably by analysing ticket data we can see what percentage of
passengers are carrying a device with wi-fi enabled (although in my case
that is often 3 or more - before you ask, personal phone, work phone and
kindle)

You have to carry a work phone? You have my sympathies. There's nothing worse
than the invisible leesh tying you to the office

Sheesh! My dog would tell you he's mostly on a leash.

How many spills can a spellchucker check?

You're confusing me with someone who gives a ****.

Well indeed, and the reason I carry a work phone is that I don't have an
office and can therefore work wherever I feel like but obviously need to
be in contact.

On 11/09/2017 14:53, Roland Perry wrote:
In message , at 13:43:05 on Mon, 11 Sep
2017, d remarked:
It can be SMS,Â* it could even be electronic billboards or display
screens.Â* Imagine walking on to a tube platform, to be greeted by a
display with an advert from Boots - "Hey Someone Somewhere - you haven't
bought Preparation H recently.Â* If your arse grapes are still troubling
you, you'll be pleased to know that we currently have 50p off our jumbo
tube" or similar....

Of course there is always the option - possibly heresy for Millenials
- to
switch off wifi on your phone. I know, its radical, but it might just
work.

You've raised a *very* interesting point. This survey may be of only
that self-selecting subset of passengers who *do* keep their wifi on [on
the tube].

Which will be most, how many people actually bother switching it on and off?


Does the associated article mention whether they attempted to correct
for this built-in bias?

In the noise.

--
Graeme Wall
This account not read.

In message , at 16:46:41 on Mon, 11 Sep
2017, Graeme Wall remarked:

You've raised a *very* interesting point. This survey may be of only
that self-selecting subset of passengers who *do* keep their wifi on
[on the tube].

Which will be most, how many people actually bother switching it on and off?

Who knows? Different demographics perhaps, which is the whole point.

I switch my wifi off whenever out and about because it's too patchy to
warrant the battery consumption.
--
Roland Perry