1. the primary data (Primary Data) as the data user to collect the data itself. The information is up-to-date with accurate, reliable data collection takes a long time. Many people are required to lose costly. Is not convenient.2. secondary data (Secondary Data) is data that has been collected, then the user is the only person who has that information back into farming to save both time and money, but sometimes it is information that does not meet or does not detail enough. In addition, users are often not aware of the errors that affect the analysis of the results may be in error.1.4 level of measurement (Level of Measurement).More information on the research were derived from the metric measurement (Measurement) means to check one other symbols instead of numbers or pad the quantity or the quality or attributes of what is measured, there are 4 levels of measurement scale is.1. the section name (Nominal Classification Scale or Scale).As a group or a category naekok by Java style number or a value that is a check together the means to add, multiply, divide, NA is not the best measure of the ta level as a number instead of a name means check pad instead of the features people instead of events or things such as Burton, Miss boen at contests.In recent years, car registration number, check number, 0 means together instead of the number 1 female instead of male. The properties of this scale can be khan is the number one together to check, but the difference is that it is not the same thing. Does not represent any quantity or quality rating, size, number, or the means to check that the values that together add, multiply, divide, NA, and from that point, quantity or quality is not mentioned. Some psychologists and therefore cannot accept this type of measurement as measurement (Measurement)Information obtained from measurement using the section name (Nominal scale). male gender (female) 1.2. nationality (Thailand, China, etc.).3. religion (Buddhism, Christianity, Islam, etc.4. career teachers, students doctor.5. phone number .........................6. เลขที่บ้าน .............................
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