Named Entity Recognition extends the value of Keyword Extraction by classifying terms in important categories such as people, places, or organizations.
In some cases, Keyword Extraction and NER systems can be quite accurate, over 90% correct, for example, in finding people names in English text. Combining Sentiment Analysis with these techniques can be powerful for determining what writers are talking about and what they have to say about it.
These technologies can be much more challenging for other languages than they are for English. Approaches that are designed for English will often perform poorly if they are naively applied on other languages without much alteration. The multilingual experience we have at Gistology is crucial for developing quality implementations for the languages of Europe, Asia, and elsewhere.