[BlindMath] Reading an ascii math formula in nvda

Sun Jan 16 20:10:09 UTC 2022

Hello Pranav,

My help pages are generally started as a permanent record of what I've needed to share with students following their questions. Most are the "How do I do ... in R?" questions.

I might get a question about the Poisson distribution in the  online teaching environment and not be able to write out the content to answer them in that online teaching environment. (We use Moodle as it happens.) My solution is to write up a quick (R) markdown document and generate the HTML and then point the student to the pages I've made. Sometimes that means I point them to a page that I made last year which saves me a bit of time of course.

The upshot is though, that I don't have a comprehensive set of pages. There is one for the Poisson distribution.
https://R-Resources.massey.ac.nz/help/poisson.html
but it does not have any examples etc. It does include how to calculate probabilities using R because that is how we do it. (We do not use the formula anymore; this is the 21st century!) Examples are in the main course content, including practical workshops.

I can point you towards those workshops if you like, but they are not brief reference material, and they focus heavily on using R. That content is aimed at being a 20 to 50 minute exercise, depending on each student's background experience (extremely variable) and cover the normal, exponential, Poisson, and binomial distributions. These are  the most commonly taught distributions, and in reality, there is very little ned to teach any others because the principles needed to use every distribution are covered by teaching these four. The real question then becomes, which distribution should I be using in this context?

As for Bayes' Theorem: This help page sort of exists, but it is not up to the final standard I'd like yet. It does not have an example which really is necessary. I recall starting the content and finding that a colleague had answered the student's question before I finished it, and I quite obviously didn't get around to perfecting it . We didn't end up making it into a workshop either.

I'm theoretically back at work after the summer break now, but summer hasn't stopped and the farm is more appealing than the office. I'm doing physical work during the day and brain work in the evenings. Let me know what you need and I'll see what else I can offer.

Jonathan

-----Original Message-----
From: BlindMath <blindmath-bounces at nfbnet.org> On Behalf Of Pranav Lal via BlindMath
Sent: Monday, 17 January 2022 12:44 AM
To: 'Blind Math list for those interested in mathematics' <blindmath at nfbnet.org>
Cc: pranav.lal at gmail.com
Subject: Re: [BlindMath] Reading an ascii math formula in nvda

Dear Jonathan,

This page is exactly what I was looking for. Do these formulae apply to the bayes theorem?

Also, do you have any notes explaining probability distributions?

Many thanks
Pranav
-----Original Message-----
From: BlindMath <blindmath-bounces at nfbnet.org> On Behalf Of Jonathan Godfrey via BlindMath
Sent: Saturday, November 20, 2021 12:20 PM
To: Blind Math list for those interested in mathematics <blindmath at nfbnet.org>
Cc: Jonathan Godfrey <A.J.Godfrey at massey.ac.nz>
Subject: Re: [BlindMath] Reading an ascii math formula in nvda

Hello,

It is a slight change on a standard deviation formula.

In a standard deviation, the individual observations are compared to a constant mean. Your formula has a mean that is changing each day. In both situations, deviations get squared, then added up, divided by one less than the number of observations (sample not population) giving a variance type thing that then gets square root applied to get back to the original scale.

You end up with a single summary statistic that relates to the deviations from target. In your case, the target is shifting but the daily deviations should be very small if the portfolio is perfectly tracking the benchmark.

I think the authors could easily have simplified the presentation by using something like X and B for the two series, both subscripted with t for time, but we seldom get to correct any author's work other than our own.

Glad my stale finance degree can be put to better use than managing my mortgage payments.

Jonathan

-----Original Message-----
From: BlindMath <blindmath-bounces at nfbnet.org> On Behalf Of Pranav Lal via BlindMath
Sent: Saturday, 20 November 2021 7:19 PM
To: 'Blind Math list for those interested in mathematics'
<blindmath at nfbnet.org>
Cc: pranav.lal at gmail.com
Subject: Re: [BlindMath] Reading an ascii math formula in nvda

Dear Jonathan,

Many thanks and yes, I am comparing tracking error of exchange traded funds.
So, is this  just a covariance computation? 

Pranav

-----Original Message-----
From: BlindMath <blindmath-bounces at nfbnet.org> On Behalf Of Jonathan Godfrey via BlindMath
Sent: Saturday, November 20, 2021 8:03 AM
To: Blind Math list for those interested in mathematics <blindmath at nfbnet.org>
Cc: Jonathan Godfrey <A.J.Godfrey at massey.ac.nz>
Subject: Re: [BlindMath] Reading an ascii math formula in nvda

Looks like the Euclidean distance between two series. Given it is finance, I suspect returns series of two asset classes, or perhaps one asset compared to an index of some description.
It is being adjusted for the lengths of the series.

The square root puts it back on the original scale; without the square root, I'd call it a covariance.

HTH
Jonathan

-----Original Message-----
From: BlindMath <blindmath-bounces at nfbnet.org> On Behalf Of Neil Soiffer via BlindMath
Sent: Saturday, 20 November 2021 2:47 PM
To: Blind Math list for those interested in mathematics <blindmath at nfbnet.org>
Cc: Neil Soiffer <soiffer at alum.mit.edu>
Subject: Re: [BlindMath] Reading an ascii math formula in nvda

In a new browser tab, open
https://apc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmathjax.gi%2F&data=04%7C01%7Ca.j.godfrey%40massey.ac.nz%7C3322ebb4f41f4b138aad08d9d8e5b4eb%7C388728e1bbd0437898dcf8682e644300%7C1%7C0%7C637779303386229805%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=aNUuHgbochf%2BT4vs4M3iJff%2Feu9dwNEmy5DznAyyCsU%3D&reserved=0
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thub.io%2FMathJax-demos-web%2Finput-tex2chtml.html&data=04%7C01%7Ca.j.go
dfrey%40massey.ac.nz%7Cbeda1318cb0846ba6ac208d9abc7ccef%7C388728e1bbd0437898
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MC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=
4yw7s43zYPoEPvRIvpvBtaX07VytKD470ec%2Bacgl2eE%3D&reserved=0.
This is a MathJaX demo page where you can paste in TeX and get the result displayed with MathML accessible to AT.
Select the example text in the edit area and replace it with your expression (which is TeX).
Click "Render TeX"
Move to the focus to the area below and you should be able to hear it and interact with it. I only tried MathPlayer, but the same is probably true for acess8math.

Hope this help,

Neil Soiffer

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<#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>

On Fri, Nov 19, 2021 at 4:43 PM Pranav Lal via BlindMath < blindmath at nfbnet.org> wrote:

> Hi all,
>
> I need to read the following formula written in ascii math with nvda. 
> I see that math player is not an option. I am not as familiar as I 
> should be with ascii math notation.
> E_d = \sqrt{\frac{\sum_{t=1}^{N}(R_{b,t} - R_{x,t})}{N-1}}
>
>
> For instance, what does \sum_{t=1}  mean? What is being added?
>
> I am using the add-on called access8Math.
>
> I went to
> https://apc01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fascii
> math.org%2F&data=04%7C01%7Ca.j.godfrey%40massey.ac.nz%7Cbeda1318cb
>
0846ba6ac208d9abc7ccef%7C388728e1bbd0437898dcf8682e644300%7C1%7C0%7C63772969
6919301735%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBT
iI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=xtUxksyEcTwiC4EzMaxs6EpxpNMJexHY2
cY1V%2FxIzP8%3D&reserved=0  and rendered the above formula. The math content is being displayed but I am unable to navigate amongst different parts of the expression. NVDA is reading  the entire expression as a block of text.
>
> It may be easier for me to just read the above formula as is, so could 
> someone translate it into plain English perhaps?
>
> Note:
> I am doing a course relating to finance which is where the above 
> formula is being used.  The people have not had a blind student before 
> and are happy to help in whatever way they scan.
>
> I am using NVDA version 2021.2.
> Firefox version = 94.0.1 (64-bit)
> Windows version = 21H2 (OS Build 22000.318)
>
> I tried the formula in google chrome. I can hear the rendering too but 
> it sounds different than it does in firefox. Hitting enter on the 
> clickable expression does nothing and I cannot interact with the 
> expression in parts to understand it.
> Google chrome Version 96.0.4664.45 (Official Build) (64-bit) Pranav
>
>
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