As mentioned earlier, the choice of a statistical technique is a complex issue, which should not be reduced to a cookbook approach. With this caveat, we have suggested appropriate techniques for different data analysis situations in Tables 1 and 2. They are meant to be a framework, and are intended as general guidelines. They should not be applied rigidly in all situations. It would be desirable to try more than one way of analyzing the data, whenever possible.
Table 1: 

No. of Variables 
Measurement Level 
Analysis Method 

NONMETRIC 

One 
Nominal 
Frequencies, Proportions 

One 
Ordinal 
Median, Mode 

One 
Preferences 
Rank Consensus among evaluators 

METRIC 

One 
Interval or ratio scale 
Mean, Median, Mode, Variance, Skewness, Kurtosis 

NONMETRIC 

Two 
Dichotomous 
Crosstabulation Chisquare 

Two 
Nominal 
Cross tabulation, Chisquare, Correspondence Analysis 

Two 
Ordinal 
Kendall's Tau,Spearman's Rho, Gamma 

METRIC 

Two 
Intervalscale 
Scatter plot, Pearson's Correlation Coefficient 

More than two 
Intervalscale 
Principal Components Analysis, Factor Analysis, Cluster Analysis Multidimensional Scaling 

Table 2: 

No. of Variables 
Measurement Level 
Analysis Method 

Dependent 
Independent 
Dependent 
Independent 

One 
One 
Nominal 
Nominal 
Nonparametric tests, Chisquare 
One 
One 
Nominal (dichotomous) 
Nominal 
Multiple Classification Analysis 
One 
One 
Nominal 
Nominal (Dichotomous) 
Wilcoxon's two sample test, Chisquare, KolmogorovSmirnov Test 
One 
One 
Intervalscale 
Nominal (Dichotomous) 
ttest, Analysis of Variance 
One 
One 
Intervalscale 
Intervalscale 
Regression Analysis 
One 
One 
Intervalscale 
Nominal 
Analysis of Variance 
One 
More 
Nominal 
Intervalscale 
Discriminant Analysis 
One 
More 
Intervalscale 
Nominal 
Analysis of Variance, Multiple Regression Analysis, Multiple Classification Analysis 
One 
More 
Interval scale 
Dummy 
Analysis of Variance, Multiple Regression Analysis, Multiple Classification Analysis 
One 
More 
Intervalscale 
Intervalscale 
Multiple Regression Analysis 