occurrence.groupby(['genus', 'species'])['datasetkey'].count()

"""
Explanation: Should we only consider certain genuses or species?
End of explanation
"""


occurrence.groupby(['locality', 'year'])['datasetkey'].count()

occurrence.groupby('year')['datasetkey'].count()

occurrence[[u'eventdate', u'day', u'month', u'year', u'locality']][occurrence.year < 1900]

"""
Explanation: There is a wide range of years of observation. Should we focus on a certain range?
End of explanation
"""


