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General Studies 1D Evidence-Based Dentistry 1 Lecture 7 Statistical Tests
Biostatistics  Descriptive  statistics   Inferential statistics   Recap…
Descriptive  statistics Central tendency Mean, median, mode Describing summary  data Central dispersion Variance, sd, range, iqr
Inferential  statistics Estimation Point estimate Mean  Confidence  interval 95% CI Inferring study result to reference population Hypothesis  testing Ho & H A p -value
Types of statistical tests ,[object Object],[object Object],[object Object],[object Object],[object Object]
The t-test ,[object Object],[object Object],[object Object]
Types of t-test ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Types of t-tests ,[object Object],[object Object],[object Object]
One sample t-test:    Test if a sample mean for a variable differs significantly from the given population with a  known  mean   example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Independent-samples (or unpaired) t-test:  Test if the population means estimated by 2 independent samples differ significantly  (e.g. group of male and group of females) example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Independent t test …… ,[object Object],[object Object],[object Object]
Independent t test  (example)…… ,[object Object],[object Object],[object Object],[object Object]
"The means age of 2 groups are not significantly different   ( P =.232).  Therefore there is no significant association between age and Periodontal. " (-3.9, 1.0)
Dependent-samples (or paired) t-test: example ,[object Object],[object Object],[object Object],[object Object],[object Object]
Paired t test ( example )…… ,[object Object],[object Object],[object Object],[object Object]
The mean of score difference (between pre- and post-intervention scores) is significantly different from zero (P<.001). We observe that post-I score is higher than pre-I score.
ANOVA ,[object Object],[object Object],[object Object],[object Object]
ANOVA ( example )…… ,[object Object],[object Object],[object Object],[object Object]
a One-way ANOVA test a b
[object Object],[object Object],[object Object]
Chi-square test ,[object Object],[object Object],[object Object]
Chi-square test …… ,[object Object],[object Object],[object Object]
Example… ,[object Object],[object Object],[object Object],[object Object]
The prevalence (proportion) of PO between male and female are not significantly different ( P  = 0.753). Therefore, there is no significant association between gender and PO. a b c
thank you

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Ebd1 lecture7 2010

  • 1. General Studies 1D Evidence-Based Dentistry 1 Lecture 7 Statistical Tests
  • 2. Biostatistics Descriptive statistics Inferential statistics Recap…
  • 3. Descriptive statistics Central tendency Mean, median, mode Describing summary data Central dispersion Variance, sd, range, iqr
  • 4. Inferential statistics Estimation Point estimate Mean Confidence interval 95% CI Inferring study result to reference population Hypothesis testing Ho & H A p -value
  • 5.
  • 6.
  • 7.
  • 8.
  • 9.
  • 10.
  • 11.
  • 12.
  • 13. &quot;The means age of 2 groups are not significantly different ( P =.232). Therefore there is no significant association between age and Periodontal. &quot; (-3.9, 1.0)
  • 14.
  • 15.
  • 16. The mean of score difference (between pre- and post-intervention scores) is significantly different from zero (P<.001). We observe that post-I score is higher than pre-I score.
  • 17.
  • 18.
  • 19. a One-way ANOVA test a b
  • 20.
  • 21.
  • 22.
  • 23.
  • 24. The prevalence (proportion) of PO between male and female are not significantly different ( P = 0.753). Therefore, there is no significant association between gender and PO. a b c