[BlindMath] Reading an ascii math formula in nvda

[pranav.lal at gmail.com]

Hi Peter,

Many thanks for your interpretation.
Rb,t denotes the daily return of the benchmark at time t, Rx,t denotes the
daily return of the fund x at
time t and N denotes the total number of trading days considered. T Ed is
usually scaled by a factor of v
252

I have to compute the tracking error of some exchange traded funds.
Pranav
-----Original Message-----
From: BlindMath <blindmath-bounces at nfbnet.org> On Behalf Of prayner--- via
BlindMath
Sent: Saturday, November 20, 2021 6:58 AM
To: Blind Math list for those interested in mathematics
<blindmath at nfbnet.org>
Cc: prayner at unimelb.edu.au
Subject: [BlindMath] Reading an ascii math formula in nvda

Is ascii math  the same as LATeX? This looks like standard LATeX to me.
Interpretation below Pranav Lal via BlindMath writes:
>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? 
You have two objects R_b and R_x. Probably they're two different types of
the thing R (whatever that might be in this context). The R things have
values at t=1, t=2 ... t=N. t is commonly time but that doesn't matter here.
For each of those values of t you take the difference between the R_b thing
and the R_x thing at that value of t. Then you add up all N of them, that's
what the \sum_{t=1}^N means. Then you divide that sum by N-1 and finally
take the square root.
cheers
Peter
>I am using the add-on called access8Math.
>
>I went to http://asciimath.org  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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