select attribute

The select attribute determines the method by which individual items are selected for presentation on a given trial.

Member of

/ select = integer

/ select = selectionmode

/ select = selectionmode(pool)

/ select = dependency(stimulusname)

/ select = dependency(listname)

/ select = listname

integer

An integer value.

selectionmode

One of the following values:

Value	Description
noreplace	Randomly selects without replacement.
sequence	Selects items in sequential order.
noreplacenorepeat	Randomly selects without replacement and without selecting any single item multiple consecutive times.
noreplacecorrect	Randomly selects without replacement unless an incorrect response is given.
noreplaceerror	Randomly selects without replacement unless a correct response is given.
replace	Randomly selects with replacement.
replacenorepeat	Randomly selects with replacement and without selecting any single item multiple consecutive times.
constant	Selects a single constant value.

dependency

One of the following values:

Value	Description
noreplacenot	Randomly selects without replacement, reselecting the item if it matches the currently selected item of the specified stimulus or list.
replacenot	Randomly selects with replacement, reselecting the item if it matches the currently selected item of the specified stimulus or list.
current	Selects the current item of the specified stimulus or list.
next	Selects the next item of the specified stimulus or list.

stimulusname

The name of a stimulus defined elsewhere in the script.

listname

The name of a list defined elsewhere in the script.

pool

A set of numbers representing the selection pool.

The default value is noreplace.

On each trial, the following stimulus selects the vice president who served with the corresponding president:

<text vicepresidents>
/ items = vicepresidentitems
/ select = current(presidents)
</text>

The following first selects Jefferson, then Adams, and then Washington:

<text presidents>
/ items = ("George Washington", "John Adams", "Thomas Jefferson")
/ select = sequence(3, 2, 1)
</text>

The following randomly selects mountain pictures and ensures that the selected item isn't the same as the currently selected valley item:

<picture moutains>
/ items = ("rainier.bmp", "baker.jpg", "sainthelens.gif")
/ select = noreplacenot(valleys)
</picture>

The following randomly selects sound files without replacement, except if an incorrect response is give on the trial:

<sound rock>
/ items = ("beatles.wav", "stones.wav", "thewho.wav")
/ select = noreplacecorrect
</sound>