Re: MA MCAS statistical fallacy

[Robert J. MacG. Dawson]

In my last posting I omitted the "very high" group on the grounds of
small size. In case anybody's curious, here's what the plot looks like
with those data included (coded as "*"; note that the vertical "error
bars" on these would be very wide!)



        Proportion of schools improved by fewer than X pts

        0   1   2   3   4   5   6   7   8  

1                               v  c
                            c   
.9                      c   l
                    *    vm
.8
                    vl
.7
                    h
.6              lm

.5          *
            m
.4          h            

.3
        h
.2

.1      
            
0       *
        0   1   2   3   4   5   6   7   8  

        -Robert Dawson


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