serial seven test in E-prime

[Meer, Nelly-van-der]

Dear all,

I was wondering whether someone could help this lay-person who tries to
programme the serial seven test in E-prime. The task goes as follows:

Serial Sevens involves presenting a participant with a starting number
from which they must subtract 7, then subtract 7 from the resultant
number and so on. A randomly generated starting number between 800 and
999, which disappears at the first key-press, is displayed on the
monitor of a desktop computer. Responses are made in the form of
three-digit numbers, which are recorded via the numeric keypad. Each
key-press results in an asterisk being displayed in the first, second or
third position, as appropriate, in a box on the screen. Pressing the
'enter' key signals the end of each response and clears the three
asterisks in the box ready for the next three-digit number. Duration ot
the task: 2 minutes. The task is scored for both total number of
subtractions and number of errors. In the case of a mistake, subsequent
responses are scored as positive if they are correct in relation to the
new number.

This task is particularly difficult to design because there are no set
correct and incorrect answers, as this relies on the previous response.
However, I am sure that it is possible to programme E-prime to determine
whether an answer is correct based on a previous answer.... but how...?

Thank you very much in advance for your responses,

Nelly van der Meer

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