This folder contains the data from Experiment 2 reported in the following publication:

Petrov, A.  (2010). Category rating is based on prototypes and not instances: 
  Evidence from feedback-dependent context effects. 
  Journal of Experimental Psychology: Human Perception and Performance, ?, ??-??.   
PDF preprint available at http://alexpetrov.com/pub/jephpp10/

= Experiment 2 =

The data was collected at the Ohio State University in 2009.  
This experiment was developed and stored under the name "CRFeedback2" (or "CRFB2" for short).

The raw data files are in ASCII format and are available in data/
See  data/raw_data_readme.txt for a description of the raw data format.  

The raw data were preprocessed by Matlab script prog/CRFB2_import_data.m into a Matlab structure
D, which was stored in data/D.mat.  It was further processed by prog/CRFB2_data_by_sbj.m to 
generate a structure H, stored in data/H.mat.  Finally, data/empir_ARL2_profile.m  generated
Figures 8-11 in the JEP:HPP paper.  See prog/html/CRFB2_empir_ARL_profile.html for a human-readable
report.

The within-subject ANOVA was done in SPSS. It is available in the SPSS folder here.


= Links =

The data for Experiment 1 are available here in ../fdbk1/
See fdbk1/Exp1_readme.txt for details.

The source code for the ANCHOR model is available on-line at http://alexpetrov.com/softw/anchor/

The source code for the INST model (aka 'protoanchor') is available here in ../INST/
See ../INST/INST_readme.txt for details on the INST implementation.

Note: The Matlab scripts depend on various utilities and on the whole infrastructure available
on Alex Petrov's office computer.  No effort has been made here to track all dependencies and
include them in this distribution. Thus, they will *not* work by themselves. An (old) version 
of the most important utilities is available on-line at http://alexpetrov.com/softw/   
The version of the ANCHOR model for the Psych Review paper (Petrov & Anderson, 2005) is available
at http://alexpetrov.com/proj/anchor/
If you download and install utils and anchor, together with the scripts provided in this archive,
you do have a fighting chance of getting everything to work.  However, this is hardly the point.
The point is to get a feeling of what was done in the JEP:HPP paper and make the experimental 
data available for your own explorations.  Let me know if I can be of further help.

Good luck!

-- Alex Petrov  2010-07-26


DISCLAIMER ***************************************************************************
The MATLAB scripts are made available in the hope that they may be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License and
the Free Software Foundation website (http://www.fsf.org) for more details.