Re: [Databionic-ESOM-User] what if...

[Christian S. <st...@Ma...>]

Hi davide,

Those results might tell you that there are no separable groups in your
data. There is a few things you might try to clarify the situation.

First of all use the Clip slider in the view tab to make finer structures
visible in the existing map. It clips big heights in the U-Matrix, so the
color gradient will be mapped over lower heights. Structures in those
might be dominated by the big mountain right now and then become visible.

You should also try and train another map without the suspected outliers,
just to see what happens. You should also evaluate wether or not they are
outliers using other methods like scatter plots.

regards,
Christian



> Hi againI'm trying to get something out of my ~4000 datapoints in 123
> attributes. Some clustering techniques (i.e. EM clustering) and other data
> analysis tools (i.e. PCA) tell me I can divide my dataset in 3 or 4 big
> "groups".
> I'm trying now ESOM tools and it looks like I have a mountain and two
> orthogonal valleys (on a toroid map). On the mountain I have one group
> (are
> those all outliers?) in the valleys I have all remaining data. It happens
> that data that were in the same group in other analysis are still next to
> each other but, since they are in the same valley (actually a plain under
> mountains...), I should say that they cannot be clustered with ESOM
> tools...
> Do you have any hint to get out this?
>
> Thanks
>
> d
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