Analysis  Using  SPSS

 Main Procedure is:  

·         Following are the brief description of the steps along with screen shots.
      Open Data editor: Start® All Programs ® SPSS for Windows®SPSS 15.0/ SPSS13.0/SPSS10.0

       For performing analysis, input the data in the following format.

            {Here variety number is termed as trt, replication as rep, tolerance score of each variety as Y  and score of the corresponding susceptible check as X. 
              It may, however, be noted that one can retain the same name or can code in any other fashion}.  

·          Enter data in SPSS Data editor. There are two views in SPSS Data Editor. In variable view, one can define the name of variables and variable types string or numeric and data view gives the spreadsheet in which data pertaining to variables may be entered in respective columns.

1. To perform analysis of covariance by taking tolerance score of each variety (Y) as dependent variable and score of the corresponding susceptible check (X) as covariate.

·         Once the data entry is complete, Choose Analyze from the Menu Bar. Now select 
              Analyze® General linear Model ® Univariate.

·         This selection displays the following screen

·         Select Y and send it to the Dependent Variable box; TRT and REP may be selected for Fixed Factor(s) box and select X and send it to the Covariate(s): box. After doing this the dialog box should be like this.

• Now define model as per design adopted to analyze the data. A Click on the model displays Univariate: Model dialog box. Click on custom then change the Build Terms as Main effects and send TRT(F), REP(F) and X(C) to the Model box.

             One gets the following screen

      2. To perform all possible pair wise variety comparisons and to identify the best variety one can follow the following steps.

·         Click Continue to return back to the Univariate dialog box, 

·         Now select Option.. and check the box for Compare main effects(LSD is default) for the  multiple pairwise comparison procedure .

·         The following screen appears:

·         Click on Continue to return back to the Univariate dialog box.

·         Click on OK to get the output.

After creating the data file following syntax may be used in the syntax editor mode to get the output.

UNIANOVA

  y  BY rep trt  WITH x

  /METHOD = SSTYPE(3)

  /INTERCEPT = INCLUDE

  /EMMEANS = TABLES(trt) WITH(x=MEAN) COMPARE ADJ(LSD)

  /CRITERIA = ALPHA(.05)

  /DESIGN = rep trt x .