\paragraph*{head - organization} A document that talks about an organization of which the entity is the head can be vital for the entity.  Jasper\_Schneider is USDA Rural Development state director for North Dakota and an article about problems of primary health centers in North Dakota is judged vital for him. 

\paragraph*{World Knowledge} Some things are impossible to know without your world knowledge. For example ''refreshments, treats, gift shop specials, "bountiful, fresh and fabulous holiday decor," a demonstration of simple ways to create unique holiday arrangements for any home; free and open to the public`` is judged relevant to Hjemkomst\_Center. This is a social media post, and unless one knows the person posting it, there is no way that this text shows that. Similarly ''learn about the gray wolf's hunting and feeding behaviors and watch the wolves have their evening meal of a full deer carcass; $15 for members, $20 for nonmembers`` is judged vital to Red\_River\_Zoo.  

\paragraph*{No document content} A small number of documents were found to have no content.

\paragraph*{Disagreement} For a few remaining documents, the authors disagree with the assessors as to why these are vital to the entity.

\section{Conclusions} \label{sec:conc}

In this paper, we examined the filtering stage of the entity-centric

stream filtering and ranking  by holding the later stages of fixed. In

particular, we studied the cleansing step, different techniques to

construct entity profiles, and the effects of entity type (Wikipedia

or Twitter) and document category (news, social, or other). We attempted to address

the following research questions: 1) does cleansing affect filtering

and subsequent performance? 2) what is the most effective way of

entity profiling? 3) is filtering different for Wikipedia and Twitter

entities? 4) are some type of documents easily filterable and others

not? 5) does a gain in recall at filtering step translate to a gain in

max-F at the end of the pipeline? and 6) what are the

circumstances under which vital documents can not be retrieved?

Cleansing may remove (parts of) the contents of documents, making

them irretrievable. However, because of the introduction of false

positives, gaining recall by filtering the raw corpus instead of the

sense that cleansing has helped to improve the recall on vital

documents and Wikipedia entities, but at the same time reduces the

recall on Twitter entities and the relative category of 

relevance ranking. Vital and relevant documents show a difference in

retrieval performance, where vital documents appear to be easier to filter than

Despite an exhaustive attempt to identify as many vital-relevant

documents as possible,  we observe that there are still documents that

we miss. While some can clearly be retrieved by modifying the

filtering procedure, some relevant and even vital documents can be

considered irretrievable. The circumstances under

which this happens are many. A few documents have no content, or it is

unclear why they have been judged vital. However, the main

circumstances under which vital documents 

can defy filtering include: outgoing link mentions,

venue-event, entity - related entity, organization - main area of

operation, entity - group, artist - artist's work,  party-politician,

and world knowledge.

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