1.Primary data (Primary Data) is a user data to the data collection, data can be accurate, reliable, up-to-date But the data takes a long time to use the power of a very high cost, inconvenience as should
.2.Secondary data (Secondary Data) as the data are collected, and the user is just who you ข้อมูลนั้น used. It is to save both time and money. But sometimes it's information that does not meet the requirements or not detailed enough.Which has applied to analysis the effect may be wrong!1.4 levels of measurement (Level of Measurement)
data in the research of plate derived from measurement, which measure (Measurement) refers to the given numbers. Or other symbols instead of ปมาณ or quality or characteristic of a measurement section measurement is 4 level is 1
.Section name Commandments (Nominal Scale or Classification Scale)
.As the data are the hot discriminant or category. By the numbers or values that define how to add, subtract, multiply, divide, not a measurement at various possible. A define numbers instead of names for the various styles . instead of the events.The number of Miss entries number footballer. The car. The given number 0 instead, female 1 number for male. Features of this section is of importance The numbers that define will only point to differences.Does not represent a number, size, quantity, or quality, any of which numbers or the various values that define นั้นนามา to add, subtract, multiply, divide not and from which does not point quantity or quality).
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