Page Comparison

Nominal

An attribute with no intrinsic ordering

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a color, the job of a person, a product code

Integer

A positive or negative integer

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the age of a person or the answer to a questionnaire

Continuous

An intrinsically quantitative variable

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the measurement of a physical quantity, the price of specific goods

Date

A date in a valid format

The date format summarizes in a single field 4 quantities:

• the year,

• the month,

• the day, 

• the date.

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1492/10/12, 12/10/1492, 1492-10-12, 12-10-1492,
1492/Oct/12, 12/Oct/1492, 1492-Oct-12 and 12-Oct-1492

Time

A time in a valid format.

The time resolution is milliseconds.

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17:27:35, 17:27:35.12, 5:27:35 PM, 17:27, 5:27 PM

Datetime

A combined date and time in a valid format

The datetime resolution is seconds.

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• date time, or 

• date*T*time.

Month

A month in a valid format

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1492/10, 10/1492, 1492-10, 10-1492, 1492/Oct, 1492-Oct, Oct/1492 and Oct-1492.

Week

A week in a valid format.

International week numbering conventions are used, therefore
2014/12/30, for example,  belongs to the first week of 2015.

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1492/W41, W41/1492, 1492-W41, W41-1492

Quarter

A period of three months in a valid format

Notice that:

• Q1 starts on January, 1st and ends on March, 31st,

• Q2 starts on April, 1st and ends on June, 30th and so on…

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1492/Q3, Q3/1492, 1492-Q3, Q3-1492