External secondary data - data that is obtained outside the firm itself.
Secondary data is data collected from other sources than your own such as reference books or the Internet.
primary data structures
It takes really long to make and to record the data.
An inherent problem in using secondary sources of data is that the data may have been skewed or manipulated a bit. Primary sources of data are always more reliable than secondary sources.
Secondary data means information that has already been processed and collected by somebody else. Disadvantages are, for example: -The information can be biased -The information may not perfectly suit you research objective (information may be qualitative) These two main points are decisive and non-debatable enough.
External secondary data - data that is obtained outside the firm itself.
Secondary data is a data collected by someone other than the user. Secondary data for social science include censuses and organizational records.
Advantages to the secondary data collection method are - 1) it saves time that would otherwise be spent collecting data, 2) provides a larger database (usually) than what would be possible to collect on ones own However there are disadvantages to the fact that the researcher cannot personally check the data so it's reliability may be questioned. See: http://en.wikipedia.org/wiki/Secondary_data The link above is primarily on the use of secondary data for purposes of calculating statistics. In this electronic age, secondary data is disseminated very rapidly, such as credit card or employment history. You may want to browse the internet about problems when personal secondary data is widely available.
Data can be classified into various forms such as structured data (organized into rows and columns), unstructured data (text, images, videos), semi-structured data (mix of structured and unstructured data), quantitative data (numerical), qualitative data (descriptive), primary data (first-hand) and secondary data (collected by others).
Secondary data is data that was collected from someone else an already exists for a different purpose. Using secondary data is usually the easiest and cost effective way of gaining data for marketing.
You can receive secondary data online from sources such as Censuses and qualitative research. You can learn more information about Secondary Data online at the Wikipedia.
Secondary data is data collected from other sources than your own such as reference books or the Internet.
primary data is where you get o fact off a computer or from a book secondary data is where you get a fact of someone and it might not be true
primary data structures
Primary data is data that is collected by the researcher. Secondary data is information that has been collected by someone other than the user.
Primary data is the the data that collected by yourself. While secondary data is those collected by others and to be reused by yourself.