Table A4.  Correlation of Market Advisory Service Performance Between Pairs of Non-Overlapping Crop Years, Wheat Revenue, 1995-1998 Crop Years
           
Correlation Measure 1995 vs. 1997   1996 vs. 1998   Average
     Rank Correlation -0.46 * -0.27 -0.37
[0.07] [0.26]
     Revenue Correlation -0.45 * -0.18 -0.32
[0.07] [0.44]
     Return Correlation -0.44 * -0.17 -0.31
  [0.08]   [0.48]    
Note: Three stars indicates significance at the 1% level, two stars indicates significance at the 5% level, and one star indicates significance at the 10% level.   Return correlations are based on the 24-month average cash price benchmark, with the return for each service computed as the continuously-compounded rate of return (natural logarithm of the ratio of net advisory price to the benchmark price). Figures in brackets are two-tailed p-values.