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For your research project, you might want to analyze a twitter feed and therefore wish to download a large number of tweets by using NCapture. Doing so you might realize that several tweets are missing and you are wondering why and how to proceed. The answer is that you usually cannot retrieve all tweets relevant to a conversation at once (depending on the number of tweets). In fact, the number of tweets that you can capture in one session may vary.
How many Tweets can I capture?
When you capture Twitter content as a dataset and import it into NVivo, you will generally get more than just the Tweets that were visible on the page. The number of Tweets that you can capture is determined by Twitter. The exact number may vary depending on the number of Tweets available and the amount of traffic on Twitter.
Follow a twitter topic over time?
If you want to follow a particular topic over time, you may need to take multiple captures at periodic intervals. You can choose to import the additional capture files as new datasets or merge them with previously imported datasets.
Find more information here: http://help-ncapture.qsrinternational.com/desktop/topics/capture_from_twitter.htm#MiniTOCBookMark7
So, in order to capture a great part of a twitter conversation, make sure to have a concise sampling strategy, just like you would have with any other (more traditional) media sources. For instance, you could capture the tweets sorted by date and make this part of your sampling strategy.