The initial filter should return some securities. I get the following counts for these industry codes
industry_code
31165133 28
31168144 10
However, probably what one wanted was to have securities that are in sector 308 or 311 OR industry code 10210023, 31165133, 31168144 (notice the OR). So, is_tradeable
should probably be
is_tradeable = base_universe & (valid_sector | valid_industry)
Using the above filter, one will get the following counts for these industry codes
industry_code
10210023 5
30845099 4
30845100 7
31165130 4
31165131 3
31165132 4
31165133 28
31165134 12
31166135 6
31167137 3
31167138 1
31167140 3
31167141 3
31167143 2
31168144 10
31169145 5
31169146 1
31169147 16
This may be more in line with expectations? Check out the attached notebook.
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