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Presentation transcript:

Statistical Fundamentals: Using Microsoft Excel for Univariate and Bivariate Analysis Alfred P. Rovai Getting Started PowerPoint Prepared by Alfred P. Rovai Presentation © 2013 by Alfred P. Rovai Microsoft® Excel® Screen Prints Courtesy of Microsoft Corporation.

Getting Started Copyright 2013 by Alfred P. Rovai Objectives Understand the Excel worksheet layout Enter data in an Excel worksheet Perform arithmetic operations

Copyright 2013 by Alfred P. Rovai Cell A1; active cell Launch Excel and open a new Excel Workbook (Windows version screenshot). Row headings; each row represents a different case Column headings; Each column represents a different variable or observation Worksheet tabs Formula bar for active cell Excel ribbon with multiple tabs

Copyright 2013 by Alfred P. Rovai Cell A1; active cell Launch Excel and open a new Excel Workbook (Macintosh version screenshot). Row headings; each row represents a different case Column headings; Each column represents a different variable or observation Worksheet tabs Formula bar for active cell Excel ribbon with multiple tabs

Copyright 2013 by Alfred P. Rovai To make a cell active, simply click on that cell. Use the mouse or the arrow keys or the return key to move around the worksheet. For example, if you press the return key twice or the down arrow key twice you move the active cell two cells down. Cell A3; active cell

Copyright 2013 by Alfred P. Rovai Typically, the first step in entering data is to enter variable names in row 1. Note the name box identifies the address of the active cell and the formula bar displays the contents of the active cell. Cell B1; active cell Name boxFormula bar

Copyright 2013 by Alfred P. Rovai Data is entered one cell at a time. The above data reflect independent data with 3 groups. Data are independent when the data for different subjects (cases) do not depend on each other. Case 2 is in group #1 and has a score of 41. Case 3 is also in group #1 and has a score of 40, etc. The format shown here is referred to as a stacked format. Cell B8; active cell Name boxFormula bar

Copyright 2013 by Alfred P. Rovai The data on this worksheet still reflect independent data with 3 groups. However, the format shown here is referred to as an unstacked format. This format often facilitates data analysis in Excel. To use this format the user converts the stacked format into this format by creating separate variables for each group and copying and pasting data from the original format after sorting data on the grouping variable (i.e., the categorical variable). Warning: rows no longer represent separate cases when data are arranged in an unstacked format.

Copyright 2013 by Alfred P. Rovai The unstacked format is a graphical representation of a frequency table. The frequency of a category (or class interval when the values are spread out) is the number of data values that fall in that category or range specified by that class interval. Frequency Table CategoryFrequency Group 14 Group 22 Group 31

Copyright 2013 by Alfred P. Rovai The data on this worksheet reflect dependent data. Data are dependent when they consist of multiple measurements for the same subject (case). For example, case 1 receives a score of 39 on a pretest measurement and a score of 42 on a posttest measurement. Warning: don’t confuse dependent data with unstacked independent data. Using dependent data, each row represents a different case whereas rows do not represent individual cases in an unstacked Independent data format.

Copyright 2013 by Alfred P. Rovai Select cell C1 and enter the text Difference. Notice the text is displayed in both cell C1 and the formula bar when cell C1 is active.

Copyright 2013 by Alfred P. Rovai Select cell C2 and enter the formula =A2-B2. Notice the following: Formulas start with an equal sign Formulas don’t contain spaces The formula =A2-B2 subtracts the value contained in cell B2 from the value contained in cell A2 When cell C2 is active, the formula is displayed in the formula bar The result of the operation is displayed in cell C2

Copyright 2013 by Alfred P. Rovai Select cell C2 and while holding the Shift key down select cell C8 in order to highlight cells C2:C8. From the Edit menu select Fill Down.

Copyright 2013 by Alfred P. Rovai Excel replicates the formula from C2 down to cell C8 using relative addressing. The original formula =A2-B2 in cell C2 is changed to =A3-B3 in cell C3, and so on until cell C8 where the formula is =A8-B8. If absolute addressing were used (i.e., =$A$8-$B$8), all the formulas in cells C2:C8 would be the same: =$A$8-$B$8 after the Fill Down operation.

Copyright 2013 by Alfred P. Rovai The following are the most common arithmetic operators used in Excel formulas + for addition, e.g., =A1+A2 – for subtraction, e.g., =A1-A2 * for multi- plication, e.g., =A1*A2 / for division, e.g., =A1/A2 Parentheses can be included to specify order of operations. For example, =(A1+A2)/A3 will add the values of cells A1 and A2 and divide the sum by the value of cell A3. Excel Syntax

Copyright 2013 by Alfred P. Rovai One can also use functions in Excel formulas. View a list and description of all Excel functions by selecting the Excel Formulas tab and clicking the Reference icon.

Copyright 2013 by Alfred P. Rovai A useful function is the AVERAGE function defined as follows: AVERAGE(number1,number2,...). Returns the arithmetic mean, where numbers represent the range of numbers. For example, the formula =AVERAGE(B2:B41) in the displayed worksheet returns the arithmetic average or mean for the posttest variable.

Copyright 2013 by Alfred P. Rovai Getting Started End of Presentation