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RISKY SHIFT: LAB REPORT WRITE-UP Week 7 Practical.

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Presentation on theme: "RISKY SHIFT: LAB REPORT WRITE-UP Week 7 Practical."— Presentation transcript:

1 RISKY SHIFT: LAB REPORT WRITE-UP Week 7 Practical

2 WEEK 1 WEEK 2 WEEK 3 WEEK 4 WEEK 5 WEEK 6 WEEK 7 WEEK 8 WEEK 9 WEEK 10 LECTUREPRACTICAL NONPARAMETRICS 11 ST PRACTICAL NONPARAMETRICS 21 ST ANALYSIS SAMPLING DISTRIBUTIONS 1 ST ANALYSIS (BY HAND) HYPOTHESIS TESTING 2 ND PRACTICAL RELATED T-TEST 2 ND ANALYSIS INDEPENDENT T-TEST INDEPENDENT ANOVA DEPENDENT ANOVA 2 ND ANALYSIS (BY HAND) 3 RD PRACTICAL 3 RD ANALYSIS NO PRACTICAL NO LECTURENO PRACTICAL WEEK 7 PRACTICALRISKY SHIFT

3 Learn to calculate the Friedman and Wilcoxon test by hand. Understand the way in which the practical reports will be marked and what you have to do to do well! BY THE END OF THE SESSION, YOU SHOULD BE ABLE TO: Clarify any additional problems that you may have regarding this lab report with your friendly neighbourhood demonstrators. LEARNING OUTCOMESRISKY SHIFT

4 PRACTICAL WRITE-UP INTRODUCTION METHOD RESULTS DISCUSSION ABSTRACT TITLE REFERENCES APPENDICES IV and DV included, precise, concise Maximum 150 words, summary of all sections Clear structure leading to experimental rationale Evidence of extra reading, beyond the handouts Sufficient information to replicate the study Participants, materials, design, procedure Clear and logical descriptive and inferential stats Well designed figures related to the findings Summary of main results, relating to introduction Evaluation of study, suggestions for future APA formatted, consistent with references in text Handouts, SPSS printouts, workings out… RISKY SHIFT

5 REMINDER: FRIEDMANRISKY SHIFT

6 FRIEDMAN BY HANDRISKY SHIFT First you should complete the How to carry out a Friedman Test worksheet. We will go through this with you. For ease, you will be working with a small data set rather than the Risky Shift data set. You will need to attach the completed worksheet to your lab report.

7 FRIEDMAN BY HANDRISKY SHIFT STEP 1: Rank each participant's scores individually ParticipantCond 1 RANK Cond 2 RANK Cond 3 RANK

8 FRIEDMAN BY HANDRISKY SHIFT STEP 1: Rank each participant's scores individually ParticipantCond 1 RANK Cond 2 RANK Cond 3 RANK

9 FRIEDMAN BY HANDRISKY SHIFT STEP 2: Calculate the rank total for each condition ParticipantCond 1 RANK Cond 2 RANK Cond 3 RANK Tc1 =Tc2 =Tc3 =

10 FRIEDMAN BY HANDRISKY SHIFT STEP 2: Calculate the rank total for each condition ParticipantCond 1 RANK Cond 2 RANK Cond 3 RANK Tc1 =22.5Tc2 =14Tc3 =11.5

11 FRIEDMAN BY HANDRISKY SHIFT STEP 3: Square the rank totals and add them together ParticipantCond 1 RANK Cond 2 RANK Cond 3 RANK Tc1 =22.5Tc2 =14Tc3 =11.5 Tc1² =Tc2² =Tc3² = Ʃ Tc² =

12 FRIEDMAN BY HANDRISKY SHIFT STEP 3: Square the rank totals and add them together ParticipantCond 1 RANK Cond 2 RANK Cond 3 RANK Tc1 =22.5Tc2 =14Tc3 =11.5 Tc1² =506.25Tc2² =196Tc3² = Ʃ Tc² = 834.5

13 FRIEDMAN BY HANDRISKY SHIFT STEP 4: Answer the following questions:- How many conditions? C = How many participants? N =

14 FRIEDMAN BY HANDRISKY SHIFT STEP 4: Answer the following questions:- How many conditions? C = 3 How many participants? N = 8

15 FRIEDMAN BY HANDRISKY SHIFT STEP 5: Enter the values for N, C and Ʃ Tc² into the formula below N = 8 C = 3 Ʃ Tc² = 834.5

16 FRIEDMAN BY HANDRISKY SHIFT STEP 5: Enter the values for N, C and Ʃ Tc² into the formula below

17 FRIEDMAN BY HANDRISKY SHIFT STEP 5: Enter the values for N, C and Ʃ Tc² into the formula below

18 FRIEDMAN BY HANDRISKY SHIFT STEP 6: Calculate the degrees of freedom df = C – 1 df = STEP 7: Determine statistical significance Assessing the statistical significance of r² depends on the number of participants and the number of groups. a) Less than 9 participants = Use a special table of critical values (on Grahams website) b) 9 or more participants = Use a Chi-Square table (on Grahams website) Χr² ( ) =, p

19 REMINDER: WILCOXONRISKY SHIFT

20 WILCOXON BY HANDRISKY SHIFT Now you should complete the How to carry out a Wilcoxon Test worksheet. Again, we will go through this with you. You will be working with a small data set again rather than the Risky Shift data set. You will need to attach the completed worksheet to your lab report.

21 WILCOXON BY HANDRISKY SHIFT STEP 1: Calculate the difference between scores ParticipantCondition ACondition BDifference

22 WILCOXON BY HANDRISKY SHIFT STEP 1: Calculate the difference between scores ParticipantCondition ACondition BDifference

23 WILCOXON BY HANDRISKY SHIFT STEP 2: Rank the differences ParticipantCondition ACondition BDifferenceRank

24 WILCOXON BY HANDRISKY SHIFT STEP 2: Rank the differences Ignore the sign of the difference (whether it is positive or negative) If more participants have the same difference –Add up the ranks they would take –Divide this by the number of ranks –For example: -1 is the lowest difference, of which there are 4. Add up the ranks: = 10, then divide this by the number of ranks: 10 / 4 = 2.5 Ignore differences of zero

25 WILCOXON BY HANDRISKY SHIFT STEP 2: Rank the differences ParticipantCondition ACondition BDifferenceRank Omit

26 WILCOXON BY HANDRISKY SHIFT STEP 3: Add together ranks belonging to scores with a positive sign ParticipantCondition ACondition BDifferenceRank Omit

27 WILCOXON BY HANDRISKY SHIFT STEP 3: Add together ranks belonging to scores with a positive sign ParticipantCondition ACondition BDifferenceRank Omit

28 WILCOXON BY HANDRISKY SHIFT STEP 4: Add together ranks belonging to scores with a negative sign ParticipantCondition ACondition BDifferenceRank Omit

29 STEP 5: Determine value of W Positive sign ranks: = 13 Negative sign ranks: =53 W-value is the smallest of these sums

30 STEP 6: Determine N N = Number of differences Omit zero differences = 11 differences

31 STEP 7: Check critical value N

32 YOUR CHOICE YOU HAVE THE REST OF THE SESSION TO FOCUS ON WHAT YOU THINK YOU NEED TO IMPROVE YOUR UNDERSTANDING LAB REPORTNONPARAMETRICS Make sure you are happy with your interpretation of the SPSS output in relation to the three experimental hypotheses,and make sure you know what needs to go into your lab report to get the best marks. Download problem5 and start to work through the questions related to the forthcoming related t- test (as well as some problems relating to correlation and regression). RISKY SHIFT


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