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Probability density function for the normal distribution
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gnuplot source under GPL:
_ln_dnorm(x, m, s) = -0.5 * log(2*pi) - log(s) - 0.5*((x-m)*1.0/s)**2 dnorm(x, mean, sd) = exp(_ln_dnorm(x, mean, sd)) pnorm(x, mean, sd) = norm((x-mean) * 1.0/sd) set samples 1001 set terminal postscript enhanced color solid lw 2 "Times-Roman" 20 set output set xrange [-5:5] set xtics 1 set yrange [0:1] set ytics 0.1 f(x,y,z) = dnorm(x, y, sqrt(z)) #use variance, not sd! set key 3.8,0.94 #f(x,y,z) = pnorm(x, y, sqrt(z)) #set key 3.8,0.2 plot \ f(x, 0, 0.2) title "{/Symbol m} = 0, {/Symbol s}^2 = 0.2", \
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