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Feb 25, 2015 at 23:15 comment added vincitus Thanks for commenting you all, the last option in this research depending on a preset dataset is indeed 3. I would've liked data on 4-∞, but I just modified a variable into an indicator of the times collaborated on a specific field. It's all quite hard to explain, next time I will try to articulate my questions in a more clear manner. Thanks everybody you've sure enlightened me on this topic!
Feb 25, 2015 at 17:51 comment added Penguin_Knight @whuber, thanks as always. I edited the answer somewhat and hopefully this can address your concern. Regards.
Feb 25, 2015 at 17:51 history edited Penguin_Knight CC BY-SA 3.0
added 413 characters in body
Feb 25, 2015 at 17:39 comment added whuber The "interval" answer conflicts with Stevens' original definition of interval scales: differences must have invariant meanings. Should the difference between "0" and "1" mean the same, and have the same effect in a model, as the difference between "1" and "2"? At best there is no way to tell from the information given, so asserting that "interval is acceptable" could be misleading.
Feb 25, 2015 at 16:28 history answered Penguin_Knight CC BY-SA 3.0