How do time periods in Facebook insights work? -


in example pasting below, first request insights data daily last month. second 1 weekly, , third per 28 days (let's call monthly). problem data days_28 same day, whereas should @ least weekly data (i.e. data last 28 days should @ least 61, not 1).

why happen? interpreting data wrong?

the urls below:

https://graph.facebook.com/1404223219793416/insights/page_stories/day?since=-1month https://graph.facebook.com/1404223219793416/insights/page_stories/week?since=-1month https://graph.facebook.com/1404223219793416/insights/page_stories/days_28?since=-1month 

here daily data:

{   "data": [     {       "id": "1404223219793416/insights/page_stories/day",        "name": "page_stories",        "period": "day",        "values": [         {           "value": 0,            "end_time": "2013-07-19t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-20t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-21t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-22t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-23t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-24t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-25t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-26t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-27t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-28t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-29t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-30t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-31t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-01t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-02t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-03t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-04t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-05t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-06t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-07t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-08t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-09t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-10t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-11t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-12t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-13t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-14t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-15t07:00:00+0000"         },          {           "value": 1,            "end_time": "2013-08-16t07:00:00+0000"         }       ],        "title": "daily page stories",        "description": "daily number of stories created page. (total count)"     }   ],    "paging": {     "previous": "https://graph.facebook.com/1404223219793416/insights/page_stories/day?since=1371647555&until=1374153155",      "next": "https://graph.facebook.com/1404223219793416/insights/page_stories/day?since=1376658755&until=1379164355"   } } 

here weekly data:

{   "data": [     {       "id": "1404223219793416/insights/page_stories/week",        "name": "page_stories",        "period": "week",        "values": [         {           "value": 0,            "end_time": "2013-07-19t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-20t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-21t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-22t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-23t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-24t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-25t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-26t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-27t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-28t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-29t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-30t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-31t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-01t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-02t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-03t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-04t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-05t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-06t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-07t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-08t07:00:00+0000"         },          {           "value": 1,            "end_time": "2013-08-09t07:00:00+0000"         },          {           "value": 1,            "end_time": "2013-08-10t07:00:00+0000"         },          {           "value": 1,            "end_time": "2013-08-11t07:00:00+0000"         },          {           "value": 2,            "end_time": "2013-08-12t07:00:00+0000"         },          {           "value": 29,            "end_time": "2013-08-13t07:00:00+0000"         },          {           "value": 50,            "end_time": "2013-08-14t07:00:00+0000"         },          {           "value": 61,            "end_time": "2013-08-15t07:00:00+0000"         },          {           "value": 61,            "end_time": "2013-08-16t07:00:00+0000"         }       ],        "title": "weekly page stories",        "description": "weekly number of stories created page. (total count)"     }   ],    "paging": {     "previous": "https://graph.facebook.com/1404223219793416/insights/page_stories/week?since=1371647903&until=1374153503",      "next": "https://graph.facebook.com/1404223219793416/insights/page_stories/week?since=1376659103&until=1379164703"   } } 

and here monthly data:

{   "data": [     {       "id": "1404223219793416/insights/page_stories/days_28",        "name": "page_stories",        "period": "days_28",        "values": [         {           "value": 0,            "end_time": "2013-07-19t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-20t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-21t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-22t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-23t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-24t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-25t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-26t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-27t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-28t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-29t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-30t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-07-31t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-01t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-02t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-03t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-04t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-05t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-06t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-07t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-08t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-09t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-10t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-11t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-12t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-13t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-14t07:00:00+0000"         },          {           "value": 0,            "end_time": "2013-08-15t07:00:00+0000"         },          {           "value": 1,            "end_time": "2013-08-16t07:00:00+0000"         }       ],        "title": "28 days page stories",        "description": "28 days number of stories created page. (total count)"     }   ],    "paging": {     "previous": "https://graph.facebook.com/1404223219793416/insights/page_stories/days_28?since=1371647956&until=1374153556",      "next": "https://graph.facebook.com/1404223219793416/insights/page_stories/days_28?since=1376659156&until=1379164756"   } } 


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