Data Analysis & EBP
NURS 335Data Analysis
Data AnalysisHow data will be analyzed depends on:research questions/hypothesesresearch designQuantitativeQualitativedata collection plan
Quan: Data Analysis (AKA Statistics)DescriptiveInferentialPurpose: describe data
Statistics: frequency distribution, graphs, central tendency, variability, distribution shapes, crosstabulationPurpose: make judgments about a population
Statistics: parametric and non-parametric tests
Hypothesis TestingUse inferential statistics
Hypothesis Testing & ErrorType I ErrorBelieve there is an effect in the population when there is not oneSignificance level (a level)Type II ErrorBelieve there is no effect in the population when there is oneStatistical power (b level)
4Inferential StatisticsParametricNonparametricInvolves estimating parametersAssumptionsHigher LOM of variablesExamples: Pearsons rt tests (independent and dependent)ANOVA
Does not estimate parametersNo assumptionsCategorical variablesExamples: Spearmans rhoChi-squareMann-Whitney UKruskal-Wallis
5Statistical Significancep value: probability valuecommonly compared to a = .05 5% probability of something occurring by chance One-tailed & Two-tailed testsOne-tailed test: statistical model that tests a directional hypothesisTwo-tailed test: statistical model that tests a non-directional hypothesis
6Qual: Data AnalysisCodingisolating words and phrases to discover meaning and create connections (Bach, Ploeg, & Black, 2011, p. 158) ThemesFound through the coding process and represent main themes consistent through all participant interviews
7After Data Analysis . . .Findings are discussedDiscussion should includeMain findingsInterpretation of the findingsHow results compare with previous researchLimitations of the study Application to nursing
Quick Review of Research Process
Research ProcessIdentification of ProblemDetermination of Research QuestionDetermination of Research MethodologyQuantitativeQualitativeForm HypothesisConduct ROLDetermine SamplingData CollectionData AnalysisDetermine SamplingData CollectionData AnalysisTriangulate DataConduct ROLModified from Figure 2-2 Boswell, 2014, p. 38
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