Twitter API on BlueMix - twitter

I'm getting familiar with data on Twitter-Insight on Blue-Mix. I have noticed that there is a added field "USER-GENDER". As this field is not in user profiles, I tried to look in the documentation but it's not mentioned how the gender is evaluated (by Surname? by previous tweets (this would probably means that a specific algorithm is used? which one?).
If you can point me to any documentation that I missed that would be highly appreciated.
Martin

You are probably referring to the Insights for Twitter documentation that lists gender information as an enrichment.
That information can be directly obtained from the Twitter profiles, by analyzing the profile data. There are other services including Twitter itself that provide gender information based on the profile data. How the gender is derived is not documented. :)

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How can I get twitter current user's gender

I have reviewed the twitter documentation #anywhere
where I can use User Object Properties but in the userdata I don't find the gender property.
When you create a twitter account it never asks for gender, so you cant get it through the API.
You would need some kind of AI to determine it.
Demographic data such as gender and age are not available from the API -- and not always appropriate as Twitter accounts can represent many things not limited to persons alive or dead.
Latest answer #2016
You still can't get twitter users' gender but can you can deduce it with some workable apis.
See node-cheat gender_by_name for all reasonable and tested solutions.

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