Observation with trend line in the normal distribution plot ?

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Hydro
Hydro 2014-9-22
评论： Star Strider 2014-9-24
I am trying to plot my data in the form of normal probability with a fitted line. however, the area under the curve exceeds 1. any thought on this?
function mynormplot(Y)
S=sort(Y);
pi=(1:length(S))/(1+length(S));
zi=norminv(pi); % Since standard normal CDF hence, mean and STD is 0 & 1 respectively
plot(S,zi,'o');
hold
T=(S-mean(Y))/std(Y);
plot(S,T,'k');
end

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回答（1 个）

Star Strider
Star Strider 2014-9-23
I have no idea what ‘pi’ is supposed to be (and please don’t use built-in function names for variable names, since pi=3.14...).
The norminv function requires that you define the mean and standard deviation in its argument list. You are giving it ‘pi’ as an argument, so it is yours to guess what it is assuming are the mean and standard deviation.

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