DDC Research, Decision Data Collection, Inc. Fredericksburg, Va.

DDC Research maintains a powerful skill set of senior statisticians, senior IT engineers, dedicated and experienced data processing staff, who use specialized statistical software, enabling us to support even the most complex statistical analyses.

DDC has successfully applied standard survey analysis techniques in thousands of research projects, including:


	Frequency and percentage counts
	Bar charts and pie charts
	Cross-tabulations
	Banner tables
	Significance testing
	Survey weighting

DDC’s skill set goes beyond that, however, and supports even more complex statistical analysis, such as the following:

	Analysis of variance		Nonparametric test
		Full Factorial		Friedman tests
		Repeated Measures		Kruskal-Wallis test
	Clustering			Mann-Whitney test
	Contingency Tables			Mood median test
	Correlation			Sign test
		Simple		Spearman rank correlation
		Partial		Wald-Wolfowitz runs test
		Multiple		Wicoxon paired-simple test
		Canonical	Principal components
	Discriminant Analysis		Linear regression
		Classification	t-Test
		Grouping		One-sample
	Factor Analysis			Two-sample
	Goodness of Fit			Multivariate one sample
		Binomial		Multivariate two sample
		Circular
		Normal
		Poisson
		Uniform