Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Effect size presentation.rob

1,810 views

Published on

Dr. Core

  • Be the first to comment

Effect size presentation.rob

  1. 1. Effect Size<br />EDL 204<br />
  2. 2. Start with Hypothesis Testing<br />You go through the 6 steps of Hypothesis Testing and get a significant result<br />So what?<br />The probability of obtaining a significant result is highly correlated with the size of the sample<br />More numbers = increase probability of significance<br />Sometimes the impact is meaningless<br />
  3. 3. Significance<br />Statistical Significance<br />Reached a result that has a probability of less than 5% that it is due to error<br />Practical Significance<br />Looks at whether the difference is useful in the real world<br />http://www.youtube.com/watch?v=rOyK_K0SOaU<br />
  4. 4. Effect Size<br />d = Cohens Effect Size<br />μ1 = Mean of Group 1<br />μ2 = Mean of Group 2<br />σ = Standard Deviation<br />
  5. 5. Effect Size<br />Results in a measure of standard deviation<br />Can be interpreted as noted by Cohen on the left<br />A large effect size would mean there would be a large impact on the population<br />
  6. 6. Effect Size<br />Used to compare studies <br />Can have different<br />Methods<br />Statistics<br />Metrics<br />Only measuring the difference in mean 1 and mean 2 divided by SD<br />
  7. 7. Visible Learning<br />Meta Analysis of 800 Meta Analyses <br />Summary of many articles on the topic<br />Uses Effect Sizes<br />1 effect size = 1 standard deviation<br />1 standard deviation = 2 years increase<br />Cohen said “Blatantly obvious”<br />PhD Students vs High School Students on IQ<br />
  8. 8. Visible Learning<br />Distribution of Effect Sizes, Chapter 2, pg 16<br />Most have a positive effect<br />Doing almost anything increases achievement<br />Set the bar at d = 0.40<br />Average of all effect sizes<br />This is not just placing a teacher in front of a room<br />Benchmark to notice real differences<br />
  9. 9. Visible Learning<br />Typical Effect Size<br />.40<br />0<br />Enhanced<br />Zero<br />Decreased<br />
  10. 10. Visible Learning<br />We want...<br />.40<br />0<br />Enhanced<br />Zero<br />Decreased<br />
  11. 11. Visible Learning<br />.40<br />.30<br />.50<br />.10<br />.20<br />.60<br />Typical<br />Teacher<br />Effects<br />.70<br />Zone of Desired Effects<br />Developmental Effects<br />.80<br />0<br />.90<br />Reverse Effects<br />1.0<br />
  12. 12. Visible Learning<br />.40<br />.30<br />.50<br />.10<br />.20<br />.60<br />Typical<br />Teacher<br />Effects<br />.70<br />Zone of Desired Effects<br />Developmental Effects<br />.80<br />0<br />.90<br />Reverse Effects<br />1.0<br />Microteaching d = .88 <br />pg 112-113<br />

×