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# negative values with density plot

Member Posts: 55 Contributor II
when using auto model i got this density plot.
I do not have negative values. How do i remove negative values and what operator is used to plot density plots

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Moderator, RapidMiner Certified Analyst, Member Posts: 1,195 Unicorn
Hi @msacs09,

Can you share your dataset in order to understand ?

Regards,

Lionel
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Moderator, RapidMiner Certified Analyst, Member Posts: 1,195 Unicorn
Hi again @msacs09,

After reflection, I think you have to keep these curves like that (although you have no negative values) : With Naive Bayes, when dealing with continuous data, a typical assumption is that the continuous values associated with each class are distributed according to a Gaussian distribution :

Regards,

Lionel

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Member Posts: 55 Contributor II
Thank you. Is there a way i can a do a density chart without negative values?? what operator should i use to get this graph with in Rapidminer?
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Member Posts: 55 Contributor II
Waoow thank you. wanted to try this right away
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Member Posts: 55 Contributor II
edited February 2019
Also, I used "Kernel Naive Bayes" and still i get the same negative values.. further is there a way we can reduce the x axis values.. for better clarity
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Moderator, RapidMiner Certified Analyst, RapidMiner Certified Expert, Member Posts: 1,635 Unicorn
What is being explained is that while there may not be negative values in your data (and negative values may in fact be impossible based on the quantity being measured), the NB algorthim models your numerical data as though they are continuous functions based on the Gaussian distribution, which means it will show the full possible range of values in the built-in charts.  This is a simplification, of course, of reality, but one that allows the NB algorithm to produce its estimates with minimal computational complexity.  If you want to customize the axis of the graphs to omit the negative range or cut off the long right tail, you'll have to do that manually (as Ingo showed above) by setting the min and max values for the X axis, which is pretty easy to do in the new charting interface in RapidMiner 9.2.

Brian T.
Lindon Ventures
Data Science Consulting from Certified RapidMiner Experts
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Member Posts: 55 Contributor II
Thank you all