Mozdeh

Big Data Text Analysis

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Mozdeh: Frequently Asked Questions

Can I use Mozdeh to collect all tweets relevant to a topic that is in the future or less than two weeks old?

Can I use Mozdeh to collect all tweets made by one or more people, even if they are from a long time ago?

Can I use Mozdeh to collect all tweets relevant to a topic that is over two weeks old?

Does Mozdeh gather 100% of tweets or just the 1% allowed by Twitter?

Does Mozdeh save the tweets into a simple text file that I can analyse myself?

Does Mozdeh continue collecting data if the computer/laptop goes into Sleep or Hibernate mode?

What happens to the data if Mozdeh crashes or if there is a power cut?

Can I find the timezones of the tweets?

Answers

Can I use Mozdeh to collect all tweets relevant to a topic that is in the future or less than two weeks old?

Yes, but if the topic started before the data collection then it might miss some of the older tweets. Start collecting tweets from before the topic starts, if possible, to minimise the chance of loosing any. Continue collecting for a few days after the event too. If there are huge numbers of tweets then you may get a sample rather than all tweets.

Can I use Mozdeh to collect all tweets made by tweets made by one or more people, even if they are from a long time ago?

Yes - use the timeline feature of Mozdeh (after starting Mozdeh and entering a project name, select the Timeline tab in the data collection wizard and enter a list of the usernames to collect - full instructions here). This will collect the most recent approximately 3200 tweets from each account, no matter now old the tweets are.

I use Mozdeh to collect all tweets relevant to a topic that is over two weeks old?

No - Mozdeh is restricted by Twitter to tweets that are up to two weeks old. You would have to buy this data from a Twitter data reseller, such as Gnip or DataSift, or sign up for commercial analytics services, such as Pulsar.

Does Mozdeh gather 100% of tweets or just the 1% allowed by Twitter?

For keyword searches, Mozdeh gathers 100% of tweets provided that (a) they are not older than 1 week, (b) the volume of search results is not so big that Mozdeh is rate limited by Twitter and cannot get them all, and (c) they are not filtered out by Twitter for being spam, duplicates or duplicate retweets. In practice, this means that Mozdeh will get close to 100% of relevant tweets unless you use hundres of queries or your topic is a major news story or Twitter event that gets tens of thousands of tweets. Twitter sets a 1% limit for its service that supplies all tweets rather than tweets matching a query - this does not apply here.

You can test this yourself by running a pilot test in Mozdeh with a single rare keyword (e.g., thelwall works well) and comparing the tweets that you get from Mozdeh with the Tweets listed by the Twitter search service. For the tweets that are up to 1 week old, there should be a 100% overlap, except that the live Twitter search includes #thelwall results and Mozdeh does not (so if you want them you would have to search for both thelwall and #thelwall in Mozdeh).

Mozdeh save the tweets into a simple text file that I can analyse myself?

Yes - to see this file, select Show Reports in Folder from the Analyse menu, then navigate to the main project folder for your project and then open the "raw data" folder. This contains a plain text file with the tweets and can be loaded into a spreadsheet for analysis.

What happens to the data if Mozdeh crashes or if there is a power cut?

If Mozdeh crashes or there is a power cut then the data is not lost but will be saved in a file called something like TwitterSearches_Tweets.txt and stored within a subfolder of the project folder within rss_data called raw data. So the full path for the file might be somethign like c:\rss_data\SNP MP test\raw data\TwitterSearches_Tweets.txt. This will contain all of the data except perhaps a few tweets from the last few minutes before the crash. If you restart Mozdeh and select the project then it will process this file as a normal project.

If you want to create a single combined Mozdeh project for more than one set of tweets then download Webometric Analyst, start it and close the startup Wizard. From the main search interface, select the Text menu, the Merge files submenu and the option Merge any number of text files (simple consecutive merge, no checking). When asked, reply Yes to the question about ignoring header lines after the first one. Select all the different Mozdeh TwitterSearches_Tweets.txt files, one at a time, and choose any name for the merged file. One the merged file is ready, export it back to Mozdeh using the Webometric Analyst button Convert Twitter Files to Mozdeh Format in the Twitter tab on the main interface. After this, start the new project in Mozdeh and it will process it.

Does Mozdeh continue collecting data if the computer/laptop goes into Sleep or Hibernate mode?

No. When the computer goes into sleep (or hibernate) mode, all programs stop running, including Mozdeh, so it would not be able to collect any data until it is brought out of sleep/hybernate mode. When Mozdeh is woken from sleep it can carry on as normal without a warning that it was asleep.

Mozdeh will work with the screen turned off, so it is safe to configure your computer power management settings to switch the display off after 30 minutes of inactivity as long “never” is set as the time period before going into sleep/hibernation mode (The “Put the Computer to sleep:” Power Option setting).

Can I find the timezones of the tweets?

From the File menu in Mozdeh, select Add country code to raw tweet fileand then select the file of origial tweets - timezone information will be added as an extra column, when known.

Made by the Statistical Cybermetrics Research Group at the University of Wolverhampton during the CREEN and CyberEmotions EU projects.