Slope of logisitic function at a certain point (p=0.5)

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Mark 2012-1-22

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Can anybody help me how to calculate the slope of a logistic function at a certain point (p=0.5) using Matlab?

The function looks as follows:

log(p/1-p) = intercept + slope x t

data =

2500         0    5.0000
7500         0    5.0000
2500    3.0000    5.0000
7500    4.0000    5.0000
2500    5.0000    5.0000
7500    4.0000    5.0000
2500    5.0000    5.0000
7500    5.0000    5.0000

[b1,d1,s1] = glmfit(data(:,1),[data(:,2) data(:,3)],'binomial')

b1 =

   -6.4717  --- Intercept
    0.0601  --- slope

How to calculate the slope at p=0.5 ? Any suggestions?

Thanks, Mark

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