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Hi,
you are right, such an operator would be nice. I have uploaded a process with our new Community Extension which performs exactly the desired task. It is called "Discard Attribute with More than x% Missing Values (Loops + Macros)" and you can download and execute the process with a few clicks after having installed our new myExperiment Community Extension from the help menu of RapidMiner.
This process loops over all attributes and calculates the fraction of missings for each attribute. If this fration is larger than the fraction defined in the first "Set Macro" operator (macro: max_unknown), the attribute will be removed from the example set.
Cheers,
Ingo
you are right, such an operator would be nice. I have uploaded a process with our new Community Extension which performs exactly the desired task. It is called "Discard Attribute with More than x% Missing Values (Loops + Macros)" and you can download and execute the process with a few clicks after having installed our new myExperiment Community Extension from the help menu of RapidMiner.
This process loops over all attributes and calculates the fraction of missings for each attribute. If this fration is larger than the fraction defined in the first "Set Macro" operator (macro: max_unknown), the attribute will be removed from the example set.
Cheers,
Ingo
Thank for your suggestion. However, two problem are met:
1. community extention is intalled, however, no operator are added.
2. At https://www.myexperiment.org/workflows/1276/versions/1.html, only txt are downloaded, and can not open as xml.
I think you can use the Remove Useless Attributes if the missing values exceed the number of same nominal values.
Anyway you could post a feature request on our bugtracker, since I think a dedicated "less than x% missing values" filter makes absolutely sense.
Greetings,
Sebastian