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From: "Brassha'per"
Date: Fri, 23 Apr 1999 08:35:45 -0500
Subject: BHF Material Test: Middle Same Means Double Trouble?

I want to think about the Materials Test for a moment.. the *test*, not
the harps, clamp, or results.

The way it worked was as follows, where H1, H2, H3 are 3 harp "trials".

H1 was played
H2 was played

The listeners chose, always, Same or Different. In this case H1 = H2?

H3 was played.

The listeners chose Same or Different. i.e. H2 = H3?

H2 is in the middle, and participates in 2 different answers.

I'm afraid that single errors may propagate.

Let's look at an arbitrary set of 5 actually played combs A and B:
1 2 3 4 5
A B A A B , so correct answers are 0 0 1 0

then suppose what I heard or guessed was
A B B A B , so test answers are 0 1 0 0

In this example, I would have heard only #3 wrong, but I would have
gotten 2 wrong answers.

You say, that's because you're trying to identify comb material as A or
B instead of Same or Different, but I don't think so. As soon as I say
Same for the 2-3 trial, then if I correctly hear the next one as
different from what I wrongly thought was the same.. 2 wrong answers
from one wrong hearing.

As has been mentioned in a couple of posts, some hearings I was more
sure of than others. One test style could be, as Lynda suggested, on a
scale of Not Sure to Certain.

And as Vern suggested--I'm never satisfied. As in the first test, with
4 materials at a time, I certainly did not think it was fair to make me
pick the material, in the most recent test I *did* want to pick the
material, since there were only 2, and guess which one what I heard came
closer to, rather than same or different! There's no pleasing me... but
in this style test, the intermediate used-twice style seemed to compound
my errors and uncertainties.

Same old objection, or a different one? ARGH don't make me pick!

Thanks for the great work guys.

Brassha'per