Raw and processed data

Data are values of qualitative or quantitative variables, belonging to a set of items.

http://en.wikipedia.org/wiki/Data

Data are values of qualitative or quantitative variables, belonging to a set of items.

http://en.wikipedia.org/wiki/Data

Set of items: Sometimes called the population; the set of objects you are interested in

Data are values of qualitative or quantitative variables, belonging to a set of items.

http://en.wikipedia.org/wiki/Data

Variables: A measurement or characteristic of an item.

Data are values of qualitative or quantitative variables, belonging to a set of items.

http://en.wikipedia.org/wiki/Data

Qualitative: Country of origin, sex, treatment

Quantitative: Height, weight, blood pressure

Raw data

• The original source of the data
• Often hard to use for data analyses
• Data analysis includes processing
• Raw data may only need to be processed once

http://en.wikipedia.org/wiki/Raw_data

Processed data

• Data that is ready for analysis
• Processing can include merging, subsetting, transforming, etc.
• There may be standards for processing
• All steps should be recorded

http://en.wikipedia.org/wiki/Computer_data_processing

http://www.illumina.com.cn/support/sequencing/sequencing_instruments/hiseq_1000.asp

http://www.cbcb.umd.edu/~hcorrada/CMSC858B/lectures/lect22_seqIntro/seqIntro.pdf