Stats 48 page 2

Stats 48 page 2 - survey. Experimental studies-a variable...

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Discrete variable (how many ) -a quantitative variable that can assume a countable number of values corresponding to isolated points along a line interval. That is, there is a gap between any two values. Continuous variable (how much)- a quantitative variable that can assume an uncountable number of values along a line interval, including every possible value between any two values. Data Sources - Data can be obtained from existing sources or from surveys and experimental studies designed to collect new data. Existing sources - data needed for aparticular application already exist 1. Employee databases 2. Customer databases 3. Internet databases 4. Government agency databases 5. Etc. Observational studies -make no attempt to control such as a
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Unformatted text preview: survey. Experimental studies-a variable of interest is first identified. Then one or more other variables are identified and controlled so that more informative data can be obtained about the variable of interest. cross-sectional data- data collected at the same or approximately the same point in time, for example, data detailing the number of building permits issued in june 2010 in each of the counties of California. Time series data- data collected over several time periods. Graphs of time series data are frequently found in business publications. Such graphs help analysts understand what happened in the past, identify any trends over time, and project future...
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This note was uploaded on 09/13/2011 for the course STATS 10 taught by Professor Christou during the Spring '11 term at UCSD.

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Stats 48 page 2 - survey. Experimental studies-a variable...

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