Analyzing Survey Questionnaires

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Using Excel for Analyzing SurveyQuestionnaires

You have created, tested, and implemented a survey, and now you would like to see theresults of your work. There are five steps in analyzing your survey data using Excel.1. Create an Excel database2. Code and Standardize data3. Input data4. Clean & Categorize data

5. Analyze data

CREATE AN EXCEL DATABASEWhen you open up Microsoft Excel, you will see a blank worksheet. This worksheet is

part of a workbook. A workbook holds all of your worksheets, and is simply another name for an Excel file.

A blank Excel worksheet is composed of a series of vertical columns, horizontal rows,and individual cells. You can select different worksheets by clicking on the tabs at the

bottom of your workbook. Columns are alphabetized A, B, C, D from left to right across the top. Rows are numbered 1, 2, 3, 4 from top to bottom down the left of the

worksheet. Cells are individual boxes within the worksheet.


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Designing a list or table

An Excel database may consist of several list/tables that can belinked using a common field/label such as respondent number.

Although Excel is quite accommodating when it comes to theinformation that is stored in a list, you should give some initialthought to how you want to organize your information. The followingare some guidelines to keep in mind when designing lists/tables:

Insert descriptive labels (one for each column) in the first row of thelist.This is the header row. Column labels should be wellassociated with the question.

Each column should contain the same type of information. Forexample, dont mix dates and text in a single column.

Dont use any empty rows within the list. For list operations, Exceldetermines the list boundaries automatically, and an empty rowsignals the end of the list.

For best results, try to keep the list on a worksheet by itself.

Design the list in its Normal Form

CODE & STANDARDIZE DATA

Survey questions are coded/labeled and act as headers of our lists/tables.

Excel has two features that facilitates coding our data :

AutoComplete: When you begin to type in a cell, Excel scans up and down thecolumn to see whether it recognizes what youre typing. If it finds a match, Excelfills in the rest of the text automatically. Press Enter to make the entry. You can turnthis feature on or off in the Edit panel of the Options dialog box.

Pick Lists: You can right-click on a cell and select Pick from List from the shortcutmenu .Excel displays a list box that shows all entries in the column. Click on theone that you want, and it is then entered into the cell. (No typing is required .)

An unanswered question is usually coded as blank or no response, however, if therequired response is quantitative then we must qualify it if it is 0 or blank.

Narrative text are usual responses to open-ended questions and are coded as answered.

Standardize values of measurements, date/time and other quantitative type of answers.Write the standardized values strategically and consistently placed in the questionnaireto clearly associate it with the answer and avoid overwriting the original answer.

INPUT DATA


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While entering your data, you may encounter some unexpected problems. Here are tipsfor preventing problems and dealing with common situations that come up whileentering data:

Gather and input the same pages of the accomplished questionnaires sorted by

respondent number

Select the upper-left data cell and choose Window Freeze Panes to make sure that theheadings are visible when the list is scrolled.

Preformat entire columns to ensure that the data has the same format. For example, if a column contains dates, format the entire column with the desired date format.

Make backup copies

Remember to SAVE, SAVE, SAVE!!! Save your file after each record using thekeyboard command .

After all your data are entered: Create at least one backup copy of your file. This will be helpful during the analysis process

To check data integrity, sample 5% randomly for each page and compare inputted data


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CLEAN & CATEGORIZE DATA

Filtering a List

Filtering a list is the process of hiding all rows in the list except those that meet somecriteria that you specify. For example, if you have a list of customers, you can filter thelist to show only those who live in Seattle. Filtering is a common (and very useful)technique. Excel provides two ways to filter a list:

AutoFilter for simple filtering criteriaAdvance Filter for more-complex filtering

Using autofilteringTo autofilter a list, start by moving the cell pointer anywhere within the list. Thenchoose Data Filter AutoFilter. Excel analyzes your list and adds drop-down arrows tothe field names in the header row. When you click the arrow in one of these dropdown

lists, the list expands to show the unique items in that column. Select an item, and Excelhides all rows except those that include the selected item. In other words, the list isfiltered by the item that you selected.

After you filter the list, the status bar displays a message that tells you how many rowsqualified. In addition, the drop-down arrow changes color to remind you that the list isfiltered by a value in that column. Autofiltering has a limit. Only the first 1,000 uniqueitems in the column appear in the drop-down list. If your list exceeds this limit, you canuse advanced filtering.

Besides showing every item in the column, the drop-down list includes other items:All: Displays all items in the column. Use this to remove filtering for a column.Top 10: Filters to display the top 10 items in the list; I discuss this later in this

chapter.


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Custom: Lets you filter the list by multiple items; I discuss this in the Customautofiltering section, later in this chapter.

Blanks: Filters the list by showing rows that contain blanks in this column. This itemappears at the bottom of the drop-down list and only if the column contains oneor more blank cells..

NonBlanks: Filters the list by showing rows that contain nonblanks in this column.This item appears at the bottom of the drop-down list and only if the columncontains one or more blank cells.

To display the entire list again, click the arrow and choose Allthe first item in thedrop-down list. Or you can select Data Filter Show All.

To move out of AutoFilter mode and remove the drop-down arrows from the fieldnames, choose Data Filter AutoFilter again. This removes the check mark from theAutoFilter menu item and restores the list to its normal state.

Custom autofilteringUsually, autofiltering involves selecting a single value for one or more columns. If youchoose the Custom option in a drop-down list, you gain a bit more flexibility in filteringthe list. Selecting the Custom option displays a dialog. The Custom AutoFilter dialog

box lets you filter in several ways:

Values above or below a specified value: For example, Annual Salary amountsgreater than or equal to 50,000.

Values within a range: For example, sales amounts greater than 10,000 AND salesamounts less than 50,000.

Two discrete values: For example, state equal to New York OR state equal to NewJersey.

Approximate matches: You can use the * and ? wildcards to filter in a number of other ways. The asterisk matches any number of characters, and the questionmark matches any single character.


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JOINING LISTS/TABLES USING MSQUERYBegin with an empty worksheet. Select Data Import External Data New DatabaseQuery, which displays the Choose Data Source dialog box. This dialog box containsthree tabs:

Databases: Lists the data sources that are known to Querythis tab may be empty,depending on which data sources are defined on your system.

Queries: Contains a list of stored queries. Again, this may or may not be empty.OLAP Cubes: Lists OLAP databases that are available for query.

Using Query without the WizardWhen you select Data Import External Data New Database Query, the Choose DataSource dialog box gives you the option of whether to use Query Wizard. If you choose

not to use Query Wizard, Microsoft Query is launched with a Select Database window


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and subsequent Add tables window prompt.

You may have to click on Options... and check System Tables for all the lists/tablesto be displayed.

To establish link between two tables, click and drag from one common field to the

other.


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The Query window has three panes, which are split horizontally:Tables pane: The top pane, which holds the selected data tables for the database.

Each data table window has a list of the fields in the table.Criteria pane: The middle pane, which holds the criteria that determine the rows that

the query returns.

Data pane: The bottom pane, which holds the data that passes the criteria.

Creating a query consists of the following steps:

1. Drag fields from the Tables pane to the Data pane. You can drag as many fields asyou want. These fields are the columns that the query will return. You can alsodouble-click a field instead of dragging it.

If an error Invalid bracketing of name 'xls.'. occurs, click on Edit Options and uncheck Qualify table names in SQL statement.

2. Enter criteria in the Criteria pane. When you activate this pane, the first row (labeledCriteria Field) displays a drop-down list that contains all the field names. Select afield and enter the criteria below it. Query updates the Data pane automatically,treating each row like an OR operator.

3. Choose File Return Data to Microsoft Excel to execute the query and place the datain a worksheet or pivot table.


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ANALYZE DATA

PivotTables provide a way to easily summarize, analyze, consolidate, filter, preparedata for charting, and to report on large quantities of raw data in a fast, flexible, ad hocmanner. They are called PivotTables because you can change their layout byrearranging, or pivoting, the row and column headings quickly and easily. However,

pivoting is only possible if the data is properly prepared for the creation of aPivotTable. The data must be in a standardized and normalized format to make the mostof the amazing PivotTable features.

To start using the PivotTable Wizard: Click on Data in the menu bar. Then click on Create a PivotTable report or PivotChart report. A window appears and then click on Microsoft list or database and PivotTable. Then select Next >.

The PivotTable Wizard asks you to choose the data you want to use. Beginwith the cursor in the range field, and highlight all of your data or selectedquestions. Include the question headers. After you have selected your data,click Next.


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In the next screen, choose New worksheet. Then click Finish

Excel then takes you to a screen that looks like the figure below.


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Choose the question for which you want to create frequencies in the PivotTable FieldList. Drag the question header from the PivotTable Field List to the Drop RowFields Here box in the PivotTable.After you have dragged the question header to the Drop Row Fields Here box, theresponse items will appear in the PivotTable .


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To make data appear in the PivotTable : Select your question from the PivotTableField List again. This time, drag the question into the field that says Drop Data ItemsHere.

Refreshing a PivotTablePivotTables are not updated each time a change occurs in their source data. To update atable, select any cell in the table and choose Data, Refresh External Data, or click thered exclamation point on the PivotTable toolbar.

Refreshing on File OpenIf you want Excel to refresh your PivotTable every time you open the workbook inwhich it resides, choose PivotTable, Table Options. (The PivotTable menu is on thePivotTable toolbar.) Then select the Refresh On Open check box in the PivotTableOptions dialog box. If you want to prevent Excel from updating the table each time youopen the workbook (for example, if the table is based on a time-consuming query of external data), be sure this check box is cleared.

Selecting Elements of a PivotTableTo select a single cell in a PivotTable, click it the normal waythat is, while the mouse

pointer is a fat white cross. To select a field item in such a way that all identical items

and all associated data are also selected, position your mouse on the edge of the item sothat the mouse pointer turns into a small black arrow, and then click.

Changing the Numeric Format for the Data AreaTo change the format of numbers in the data area, select any cell in the data area. Thenclick the Field Settings tool on the PivotTable toolbar (or choose PivotTable, FieldSettings). In the PivotTable Field dialog box , click Number, and then select the formatyou want. If your data area includes more than one field, you need to format each fieldseparately .


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Changing a PivotTables CalculationsBy default, Excel populates the data area of your PivotTable by applying the Sumfunction to any numeric field you put in the data area or the Count function to anynonnumeric field. But you can choose from many alternative forms of calculation, andyou can add your own calculated fields to the table.

Using a Different Summary FunctionTo switch to a different summary function, select any cell in the data area of your PivotTable. Then click the Field Settings button on the PivotTable toolbar (or choosePivotTable, Field Settings). Excel displays the PivotTable Field dialog box. Select thefunction you want to use, and then click OK.


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Using Multiple Data FieldsTo use a second or subsequent field, drag another field from the PivotTable Field Listinto the data area of the table If you add a second field to the data area of your table,Excel displays subtotals for each field.

Notice that the table now includes a new field heading called Data .

Applying Multiple Summary Functions to the Same FieldYou can apply as many summary functions as you want to a field. To use a second or subsequent function with a field thats already in the data area of your PivotTable, draganother copy of the field from the PivotTable Field List into the data area of the table.Then select a data cell, choose PivotTable, Field Settings, choose the function you wantto use, and click OK. The available summary functions are Sum, Count, Average, Max,Min, Product, Count Nums, StdDev, StdDevp, Var, and Varp.


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Sorting ItemsIf you sort field items using the standard Sort command, Excel will sort all instances of your field items and preserve the sort order when you pivot the table.

You can also sort field items using an AutoSort feature. Like the standard Sortcommand, autoSort rearranges table material across all instances and preserves theorder you want even hen you move fields from axis to axis. However, the AutoSortfeature gives you the additional option of sorting field items on the basis of their datavalues .

Using AutoSortTo use AutoSort for a field, follow these steps:1 Select an item in the field or the fields heading.2 Click the Field Settings button on the PivotTable toolbar (or choose PivotTable, Field

Settings).3 Click the Advanced button.4 In the PivotTable Field Advanced Options dialog box, choose the Ascending or

Descending option, and then select the field you want to sort from the Using Fielddrop-down list. For example, to sort Channel items from those with highest sales tothose with lowest, you would select the Descending option and Sum Of Sales. To turnAutoSort off, return to the PivotTable Field Advanced Options dialog box. Under AutoSort Options, choose Manual .

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