SPAN 101 Chapter Notes - Chapter 1-2: Randomness, Data Mining, Mutual Fund
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Percentages and averages: if your stock portfolio drops by 50% but rebounds by. Uncertainty: if the meteorologist predicts a 60% chance of rain today, should the. Everything varies but we are not sure how things vary. Rows/records/case: individual cases about whom we record some characteristics. Variables (columns): characteristics recorded about each individual or case. Data: specific values of variables student, you have data. Relational database: two or more separate data tables are linked together so that information can be merged across them relation. Categorical variable: when a variable names categories and answers questions about how cases fall into those categories. A table of customers, along with demographic information on each, is such a. Once you measure each student and obtain actual values of height for each. The high of students in a university class: descriptive responses. (cid:498)what type of mutual fund do you invest in(cid:499, phone numbers, postal codes, nominal variables: used to make categories, ordinal variables: natural ordering.
