Standard Deviation graph is slightly offset for one value

[Higeath]

With mean 3 and standard deviation 1 graph is slightly tilted and looks normal for all other values. It also happens with mean 6 sd 2, mean 9 sd 3 etc. here is an image of that happening http://imgur.com/a/fDP3M does anybody know why is that?

[John Matthews]

Cross-posted here.

[david.gilbert]

There is a flag (autoRangeStickyZero) that you can set on the axis to control this:

Code: Select all

    /**
     * A flag that affects the size of the margins added to the axis range when
     * the range is determined automatically.  If the value 0 falls within the
     * margin and this flag is TRUE, then the margin is truncated at zero.
     */
    private boolean autoRangeStickyZero;

The default is true, so that when margins are added to the axis range but zero falls within the margin, then the axis is forced to start at zero. This very often is what people expect, but in your case not so set the flag the false.