Statistical Resources

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  Calculation of the various Standard Errors of Measurement (Excel spreadsheet)  [Oct 2012: Minor errors corrected in calculations for 2 or an arbitrary number of SDs/SEMs; with thanks to Martin Roberts]
  

• Example worked calculation of Cronbach's alpha and SEM for very small N (Excel spreadsheet)
• A beta version of a modification of the iMAP2 program with a different calculation for significance testing, and other modifications. In addition there is a small 'wrapper' program to run. Please note that this is beta software and no responsibility can be taken for any errors or other problems with its use. Click here to download the program, and click here to download the Matlab wrapper, as well as here for a function that the program needs (HeatMapRangeSetting).
• Power of a genome-wide association study (GWAS) for finding a gene for handedness, April 2012, [Note: This was a working document, and is provided only as an example of the approach to the calculations, and final checks on it have not been made. It was subsequently superseded by the Monte Carlo simulations].