Data structure of "statistics" is dictionary

[afuetterer]

The Parser class in the library ddi.py creates a dictionary of lists:

result.json

{
  "statistics":
    {
      "names": ["valid", "invalid"],
      "values": [1, 0]
    }
}

Do not keep this behavior. Instead create a dictionary without the lists, looking like this:

result.json

{
  "statistics":
    {
      "valid": 1,
      "invalid": 0,
    }
}

See the dataset_schema for reference:

collect_stata/tests/dataset_schema.json

Lines 24 to 52 in 324c418

	"statistics": {
	"type": "object",
	"properties": {
	"Min.": {
	"type": "number"
	},
	"1st Qu.": {
	"type": "number"
	},
	"Median": {
	"type": "number"
	},
	"Mean": {
	"type": "number"
	},
	"3rd Qu.": {
	"type": "number"
	},
	"Max": {
	"type": "number"
	},
	"valid": {
	"type": "number"
	},
	"invalid": {
	"type": "number"
	}
	}
	},