Shuffle datamatrix and update correct response

aswv

In my experiment, I have a learning phase as below, where participants are asked to learn the source-target pairing. (i have 6 pairs in original exp)

      var1                            var2
sourceword1             targetword1
sourceword2             targetword2
sourceword3             targetword3

In the testing phase, participants are presented with full factorial pairing and asked to pick the correct combination.

I am using data matrix to read variables from file.

1. I want to randomize the pairing per participant in the learning phase. For example, for the next participant, I want sourceword1 to be paired with targetword3(randomly). How can I do that in data matrix?
2. Even if I shuffle the learning phase, how can i update the "correct response" for testing phase ? For example, for the first participant S1 - T1 is the correct pair, but for next participant S1-T3 is the correct pair.
   Now I am reading the full factorial test data also from a file, is it possible to set the correct response inside the code?

regards,
aswv

sebastiaan

Hi,

I don't fully understand what you're trying to do, but here's an idea to get you started: Instead of specifying the words directly, you specify variable names, like so:

var1                     var2
[sourceword0]            [targetword0]
[sourceword1]            [targetword1]
[sourceword2]            [targetword2]

And you keep the pairing constant: [sourceword1] is always paired with [targetword1], etc. This makes it easy to determine which pairings are correct during the test phase, right? Because you can just hard-code that.

Then, to nevertheless randomize which words are paired for each participant, you randomly assign actual words to the sourceword[x] and targetword[x] variables. For example like so:

import random

source_words = ['dog', 'cat', 'bunny']
target_words = ['tree', 'house', 'bottle']
random.shuffle(source_words)
random.shuffle(target_words)

for i, (source_word, target_word) in enumerate(zip(source_words, target_words)):
    var.set('sourceword%d' % i, source_word)
    var.set('targetword%d' % i, target_word)

Do you see what I mean? That should make life easier, right? And you don't need to do anything fancy with DataMatrix.

Cheers,
Sebastiaan

aswv

Dear Sebastiaan,

In this thread i asked for a solution, which is the reason why I am using data matrix.

But maybe I can read take the values from the data matrix to a list and manipulate the results as above.