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Data Types and Data Sources

Data Types and Data Sources. Comp3503 Based on material originally prepared by Luqian Zhu January, 2003. 1 Datum, 10 Data. A datum - any position or element in relation to which others are determined Data is the plural noun for datum, but commonly data is used for both singular and plural.

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Data Types and Data Sources

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  1. Data Types and Data Sources Comp3503 Based on material originally prepared by Luqian Zhu January, 2003

  2. 1 Datum, 10 Data • A datum - any position or element in relation to which others are determined • Data is the plural noun for datum, but commonly data is used for both singular and plural

  3. Data Types • There are three fundamental types of data: • Nominal – cannot be placed on a metric scale • Eg. marital status: single, married, divorced, widowed • Ordinal – can be ordered but differences are not strictly measurable • Eg. Grade: A, B, C; Size: small, medium, big • Interval – can be placed on a metric scale • Eg. Grade: 75%, 80%, 93%; Temperature • Discrete (1,2,3,4,5), Continuous (3.14159,2.714)

  4. MetaData - data about the data It is very important to record: • Data’s type, range, example values • Its source – how was it collected and where • Date/Time of collection • Who collected the data … Much more on this later ..

  5. Data Sources • A data source is the point of origin of a datum • In knowledge management we collect, process and analyze data • From internal sources, such as card readers, telephone equipment, electronic meters, web logs • From external sources, like governments and business associations • External sources often provide access to information that would otherwise not be feasible for a single business to obtain

  6. Data Processing Flowchart The Knowledge Discovery in Databases process will examine these activities

  7. Methods of collecting data • Census • Sample Survey • Administrative data

  8. Methods of collecting data Census • Data collected about every unit in the group or population. • Governments collect human and business population census every n years

  9. Methods of collecting data Sample Survey • Only portion of the total population is sampled or approached for data. • Sampling is not as easy as it might seem • Suggest the best method of sampling Acadia students opinions on the ASU President • Suggest the best method of getting the opinion of participants at a conference on E-Commerce

  10. Method of collecting data Administrative Data • They are collected as a result of an organization’s day-to-day operations: • Time sheets and login/out records • Card readers (door access) • Business transactions (bill payment) • Truck mileage • Fluid use (water, oil, gas) • Inventory dispensed / received

  11. External sources of Data • Statistic Canada: Obtain data from any of the Regional Reference Centres across Canada, on the Statistics Canada website, and from most community libraries. http://www.statcan.ca/ http://www.statcan.gc.ca/rdc-cdr/data-donnee-eng.htm

  12. External sources of Data • Open Data in Canada • http://en.wikipedia.org/wiki/Open_data_in_Canada • http://data.gc.ca/eng • Gov’t Websites • https://www.ic.gc.ca/eic/site/cis-sic.nsf/eng/home • http://www.dfo-mpo.gc.ca/stats/stats-eng.htm • http://www.tc.gc.ca/eng/motorvehiclesafety/resources-researchstats-menu-847.htm • http://climate.weather.gc.ca • Geo-spacial data • http://www.mapinfo.com/ • http://www.canadapost.ca/cpo/mc/business/productsservices/mailing/pcdp.jsf • Research Data Canada • http://rds-sdr.cisti-icist.nrc-cnrc.gc.ca/eng/

  13. Definitions and notes St. John’s Halifax Saint John Chicoutimi-Jonqui鑢e Qu閎ec Number Total in-migrants 16,195 44,655 8,780 10,980 58,170 Intraprovincial migrants 9,245 12,835 3,535 8,650 45,480 Interprovincial migrants 5,385 25,845 4,815 1,455 5,525 External migrants 1,560 5,975 430 880 7,165 Total out-migrants 18,580 42,410 9,870 14,170 49,340 Intraprovincial migrants 5,595 13,395 4,540 12,560 42,770 Interprovincial migrants 12,980 29,015 5,330 1,610 6,570 Source: Statistics Canada, 1996 Census Nation tables Sample: Migrants 5 years and over by components of migration, 1996 Census, census metropolitan areas

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