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· If the arrow is pointing to the right, then the cursor will go across the row, to the next column when you press Enter. b. Giv e the columns appropriate titles: The best way to enter data into a worksheet is to create a separate column f or each variable in the data set. In the example abov e, there are 3 v ariables so we will put the data f or each of these 3 v ariables into a separate column. It is always a good idea to giv e each column a name (which will probably correspond to the variable name). Notice that the top of each column is labeled C1, C2, etc. W e can do better at naming the columns (v ariables) than that! The next row contains shaded cells. It is in this row where you can giv e each column a name. For example, we will enter each persons sex into the first column, so let’s call the first column sex. Type in sex in the shaded cell directly under the C1. Repeat this process f or height in inches and major in the cells under C2 and C3, respectiv ely. Now take a f ew minutes to enter the data given above into the worksheet. c. Data Types As mentioned abov e, each column corresponds to a unique variable. Variables are either quantitative or categorical. Theref ore, the “type of data” in each column is either quantitativ e or categorical. Howev er, Minitab has diff erent names f or “quantitative” and “categorical”: 1. Numerical: (i.e. “quantitativ e”) Numerical data are the only type Minitab will use f or statistical calculations. Numerical data are aligned on the right side of the column. Minitab will not recognize numbers with commas as numbers but will consider them text. 2. T ext: (i.e. “categorical”) Text data cannot be used f or computations. Though “text” generally means words or characters, numbers can be classified as text. If column 1 has text in it, the column label will change from C1 to C1T. Data types can be changed. See the details in the Manipulating Data section. 3. Date/T ime: Minitab recognizes 3/5/00 as a date and 4:30 as a time but will store these internally as a number so you can manipulate them. The column label will indicate a date or time value by putting a D after the column name (for example C1D). (Note: we will not use dates and/or times often in this class.) d. Manipulating Data Types Minitab can change data types within limits. You cannot make a simple switch of people’s names to numeric values, but if you hav e a column of numbers that was accidentally entered as text, then you can change those numbers to numeric v alues. Use the commands in the Act...
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This document was uploaded on 02/15/2014 for the course STAT 351 at Oregon State.
- Spring '14