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How can using randomly delete method?

StanleyTasStanleyTas Member Posts: 6 Learner I
in Help
This is my process.



and this is my result



but, this result is error.

I need to show this one↓



who can tell me, I lost what's attribute?

this is csv file.


Answers

  • MartinLiebigMartinLiebig Administrator, Moderator, Employee, RapidMiner Certified Analyst, RapidMiner Certified Expert, University Professor Posts: 3,531 RM Data Scientist
    I am sorry, but from your description it is unclear what your problem is?

    Best,
    Martin
    - Sr. Director Data Solutions, Altair RapidMiner -
    Dortmund, Germany
  • StanleyTasStanleyTas Member Posts: 6 Learner I
    edited August 2020
    I mean, how can use csv file to display the result.

    Task: Randomly delete 70% of the points of the outer spiral (see figures below).



    I had tried more methods, but I always fail

  • Telcontar120Telcontar120 RapidMiner Certified Analyst, RapidMiner Certified Expert, Member Posts: 1,635 Unicorn
    I think you probably need to define two clusters using a method like DBSCAN, which will isolate the two spirals from each other.  Once you have that, then you can generate a random number for the first cluster (or the one that corresponds to the outer spiral) and then remove 70% of those based on a simple numerical threshold.
    Brian T.
    Lindon Ventures 
    Data Science Consulting from Certified RapidMiner Experts
  • StanleyTasStanleyTas Member Posts: 6 Learner I
    I have to use DBSCAN operation, but I don't know why cannot succeed.
  • StanleyTasStanleyTas Member Posts: 6 Learner I
    who knows how can solve it?
  • MartinLiebigMartinLiebig Administrator, Moderator, Employee, RapidMiner Certified Analyst, RapidMiner Certified Expert, University Professor Posts: 3,531 RM Data Scientist
    Hi,
    what you probably want to do: Apply DBScan on your data, check for the cluster which makes the outer ring, Filter for the outer ring, sample it down.

    This should be enough to solve this. We are happy to help here with questions to our software. We are however not doing your complete assignments.

    Best,
    Martin
    - Sr. Director Data Solutions, Altair RapidMiner -
    Dortmund, Germany
  • StanleyTasStanleyTas Member Posts: 6 Learner I
    that's no assignment, it just exercise :)
  • MartinLiebigMartinLiebig Administrator, Moderator, Employee, RapidMiner Certified Analyst, RapidMiner Certified Expert, University Professor Posts: 3,531 RM Data Scientist
    Than I am sorry, pretty much looks like an assignment from a university.
    - Sr. Director Data Solutions, Altair RapidMiner -
    Dortmund, Germany
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