[BlindRUG] I can't go on learning R like this!

[Amy Albin]

>From the Regression chapter of the Blind R book


There are non-graphical substitutes for the standard residuals
analysis graphs that show the presence of non-constant variance; they
are seldom taught as part of the standard introduction to regression
analysis. A formal hypothesis test for non-constant variance can be
conducted using either the Breusch-Pagan test found using the bptest()
function, the Goldfeld-Quandt test found using the gqtest() function,
both from the lmtest package, or the Non-constant Variance test found
using the ncvTest() from the car package. These tests are simple to
use if you are comfortable with hypothesis testing, but you will need
to

My professor said these types of tests are bad because:

1. If the sample is large, we will find significance even if it doesn't matter.
2. If the sample is small, we may miss significance when there
actually is a problem.

I've never heard of the tests mentioned above, but would the same
principles apply?

Is the real answer to this question that blind people don't have as
good methods available as sighted people?

On 3/8/22, Amy Albin <amyralbin at gmail.com> wrote:
> Hello All,
>
> I keep trying to learn R but keep running into problems I just can't
> figure out how to solve.
>
> Some of the problems are specific to how to make things screen reader
> friendly.
>
> In other situations, I'm doing exactly what the script says (bootstrap
> function) but it doesn't work! I'm being a good student and trying to
> logically trouble shoot and type it different ways but it still
> doesn't work!
>
> For this entire thing, I've probably spent about 2 hours on it, and I
> don't even know how to read the regression coefficients or test for
> homosastecity.
>
> It is so discouraging because in my field, we are expected to be able
> to do these things! And I am dedicated! And I do put in the hours! But
> I still can't figure it out.
>
> I am thinking of getting a tutor at my school, but they probably
> wouldn't know how to make things screen reader friendly.
>
> Can someone hear read the files I attached and give me suggestions?
>
> Thanks!
>
> Best,
>
> Amy Albin
> Pronouns: she/her/hers
>