<OT> unix math function: norm

[Joel Hammer]

Thanks for the answer. It is helpful.

What I would like to do is make a Gaussian normal curve that will
superimpose itself over bar graphs showing a population distribution.
The idea is to give an immediate visual impression of how far from
"normal" the population data is given the population mean and std dev.
I haven't had success with this. I can't seen to get it right.  What I
see is a much higher peak of my normal curve than what I see in my
data. I have attached a plot in fact. Here is the plot file for this.
(I use a big bash script to see this stuff up for gnuplot.)

set key left Left
u=13.35000000000000000000
var=.47548245614035087719
display_v=.475
display_u=13.350
set label 1 "mean = 13.350 " at 15.2,.13205 right
set label 2 "std dev = .689 " at 15.2,.13205*.95 right
set label 3 "std error mean = .052 " at 15.2 ,.13205*.90 right
set label 4 "count = 172 " at 15.2,.13205*.85 right
std=.68955235924500387223
count=172
stderrormean=.0027
set ylabel "Result Result Frequency"
set xlabel " "
f(x)=exp(-((x-u)**2/(2*var)))/(sqrt(2*pi*var))
plot "/tmp/plot_data_bar" using 2:1 notitle with boxes , f(x)           

Note: My graph labels get squashed when I add the Normal curve. That's on my todo
list after I understand what these normal curves really mean.
BTW, gnuplot is lots of fun and it seems to work for my simple needs.

Joel

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