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I am confused as to what an argument is. I thought they were variables, but the columns are called that. If I want to analyze the time a participant takes to point to a point on the screen, what would that be called? An argument or a variable?

asked 01 Oct '11, 05:38

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david ♦
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An argument is one item in a matrix variable. So, if you have a column called "reach", you can use the vocab editor to create multiple arguments. For example, "reach" could have two items that are coded in each cell: [hand], [target]. Hand and targets are arguments within the variable "reach".

Analyzing times involves the onsets and offsets of cells. The onsets and offsets of cells are treated as built-in arguments of a cell. Every cell has an onset and an offset. You can code the onset of a cell as the time a person starts to move their hand and the offset of the cell as the time that they reach the point. Subtracting the onset from the offset will give you the time to reach.

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answered 01 Oct '11, 08:00

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JohnFranchak ♦
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If you have time, you might read through this paper on MacSHAPA:

http://dx.doi.org/10.1006/ijhc.1994.1077

Section 2.3.1 on p.649 describes all the data types and the authors' suggestions on how to use them.

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answered 20 Oct '11, 03:18

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Antony
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question asked: 01 Oct '11, 05:38

question was seen: 3,839 times

last updated: 20 Oct '11, 03:18

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