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Using Masks with Custom Factors

Hi,

I am calculating the operating efficiency of companies in a Custom Factor as shown in the attached notebook. Next, I would like to get the top 50% of the assets by this value from the default_us_equity_universe_mask() universe. So, I am using:

universe = Efficiency(mask = default_us_equity_universe_mask()).percentile_between(50, 100)  

But this is returning 0 assets, even though the Efficiency has values for these assets.
What should I do to correct this?

Thanks,
Ishwar.

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