Add fixed designs from Griskevicius et al (2011)

[drbenvincent]

Griskevicius et al (2011) provide a set of 7 fixed delay discounting questions and 7 fixed risky choice questions. It would be useful to include these, in the same way that we include the 27-item fixed set from Kirby.

It could be instructive to include these in the parameter recovery simulations so that we can just have another point of comparison for our approach.

Delay Discounting Questions

• £100 tomorrow, or £110 ninety days from now?
• £100 tomorrow, or £120 ninety days from now?
• £100 tomorrow, or £130 ninety days from now?
• £100 tomorrow, or £140 ninety days from now?
• £100 tomorrow, or £150 ninety days from now?
• £100 tomorrow, or £160 ninety days from now?
• £100 tomorrow, or £170 ninety days from now?

Risky Choice Questions

• a 50% chance of getting £800, or £100 for sure? 

• a 50% chance of getting £800, or £200 for sure?
• a 50% chance of getting £800, or £300 for sure?
• a 50% chance of getting £800, or £400 for sure?
• a 50% chance of getting £800, or £500 for sure?
• 
a 50% chance of getting £800, or £600 for sure?
• a 50% chance of getting £800, or £700 for sure?

Tasks

• [x] add class for delayed choices
• [x] add class for risky choices
• [x] add basic unit tests

Reference Griskevicius, V., Tybur, J. M., Delton, A. W., & Robertson, T. E. (2011). The influence of mortality and socioeconomic status on risk and delayed rewards: A life history theory approach. Journal of Personality and Social Psychology, 100(6), 1015–26. http://doi.org/10.1037/a0022403

[drbenvincent]

42 makes these new designs available from the GUI menu (chooser.py) in PsychoPy