Questionnaire Development: SPSS and Reliability Personality Lab October 8, 2010

Open Google Docs Spreadsheet

Download Spreadsheet to Desktop in Excel Format

Save to Desktop

Get Data Ready for Analysis: Open in Excel Verify responses are numbers Column headings are questions-- revise

Getting Data into SPSS Open SPSS Click “cancel” on opening screen

Getting Data into SPSS File > Open > Data

Getting Data into SPSS Change “files of type” to Excel

Getting Data into SPSS Open your spreadsheet, Click “OK”

Getting Data into SPSS Spreadsheet Opens

Save SPSS File Save as type – make sure it is “.sav”

Reverse Coding Items Transform > Recode into same variables Select items to reverse code Click on “Old and New Values”

Reverse Coding Items If 4 point scale ▫Old value enter 4, new value enter 1, click “add” ▫Old value enter 3, new value enter 2, click “add” ▫When finished click continue to reverse other items ▫Click OK when all items reverse coded

Running Reliability Analysis Analyze > Scale > Reliability Analysis Select items for analysis Click “Statistics” and check “item” and “scale if item deleted” Click continue Click OK See Output

Running Reliability Analysis

Output from Reliability Analysis

Interpret Output Case Processing Summary – N is # of Test Takers Reliability Statistics – Cronbach’s Alpha is our stat, marginal, good, very good Item Statistics – average response for all test takers Item total Statistics – use to determine which items stay, get dropped

Item Total Statistics If reliability goes up after deleting item, bad item If reliability goes down after deleting item, good item See item total correlations Q3 good item, Q2 bad item

Revise Questionnaire Use best judgment to exclude items Drop a couple of items, rerun reliability analysis, check results Drop more items, check results, Cronbach’s Alpha go up or down? Pick final set of items Run Reliability Analysis with final set of items If good reliability, use questions for your questionnaire

Update Questionnaire Include subset of old questionnaire items Include validity questionnaire items Check for typos Submit to friends and family