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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 + PROBLEMS 1 HYPOTHESIS TESTING 2 ND PRACTICAL RELATED T-TEST 2 ND ANALYSIS + SOLUTIONS 1 INDEPENDENT T-TEST INDEPENDENT ANOVA DEPENDENT ANOVA 2 ND ANALYSIS + PROBLEMS 2 3 RD PRACTICAL 3 RD ANALYSIS + SOLUTIONS 2 3 RD ANALYSIS + PROBLEMS 3 NO LECTURENO PRACTICAL WEEK 7 PRACTICALRISKY SHIFT

3 Tackle an additional problem sheet which should help you understand the principles behind non-parametric tests more fully. Learn to calculate the 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 APPENDICIES 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 WILCOXON BY HANDRISKY SHIFT DOWNLOAD AND SAVE THE FILE WILCOXONBYHAND First, you should be able to complete the smaller exercise on the Wilcoxonbyhand document, and check your workings using wilcoxonbyhand_done There is an addition exercise which provides you with the steps to carry out a Wilcoxon by hand on the Risky Shift data using Excel. Taking a look at this exercise should improve your Excel skills if nothing else. DO NOT PANIC ABOUT GETTING THROUGH BOTH EXERCISES. FOCUS ON UNDERSTANDING HOW TO DO WILCOXON BY HAND. DOWNLOAD AND SAVE THE FILE WILCOXONBYHAND_DONE

6 WILCOXON BY HANDRISKY SHIFT Wilcoxon testRATINGS + WITHIN Ss + 2 GROUPS Heres a reminder of how to do the Wilcoxon ranking from the lecture… Follow the sheet to complete a Wilcoxon for the small data set.

7 Tackle an additional problem sheet which should help you more fully understand the principles behind non-parametric tests. Learn to calculate the 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

8 YOUR CHOICE YOU HAVE THE REST OF THE SESSION TO FOCUS ON WHAT YOU THINK YOU NEED TO IMPROVE YOUR UNDERSTANDING LAB REPORTTESTS BY HANDNONPARAMETRICS Try working through the second Wilcoxon analysis using the riskyinexcel workbook and compare your hand results with the results you obtained from SPSS. The brave could also try a Friedmans test by hand using Grahams guide. 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

9 DOWNLOAD AND SAVE THE FILE RISKYINEXCEL WILCOXON BY HANDRISKY SHIFT Theres an awful lot of data here, so its probably best to focus on one of the hypotheses and take it slowly. Q2: Is the average level of risk recorded in the PRE assessment different from the risk recorded in the GROUP assessment? Wilcoxon testRATINGS + WITHIN Ss + 2 GROUPS At the bottom of the sheet (and the separate Word file), there are instructions on how to calculate Wilcoxon using Excel. DOWNLOAD AND SAVE THE FILE WILCOXONBYHAND

10 WILCOXON BY HANDRISKY SHIFT Q2: Is the average level of risk recorded in the PRE assessment different from the risk recorded in the GROUP assessment? Wilcoxon testRATINGS + WITHIN Ss + 2 GROUPS 1) CALCULATE THE DIFFERENCE BETWEEN D AND C SCORES IN (H) AND RETAIN THE SIGN. = CELL ab - CELL cd

11 WILCOXON BY HANDRISKY SHIFT Q2: Is the average level of risk recorded in the PRE assessment different from the risk recorded in the GROUP assessment? Wilcoxon testRATINGS + WITHIN Ss + 2 GROUPS 2) CALCULATE THE ABSOLUTE DIFFERENCE FOR (H) IN (J) =ABS (CELL)

12 WILCOXON BY HANDRISKY SHIFT Q2: Is the average level of risk recorded in the PRE assessment different from the risk recorded in the GROUP assessment? Wilcoxon testRATINGS + WITHIN Ss + 2 GROUPS 3) COPY AND PASTE ID AND SCORE VALUES FROM COLUMN I AND J INTO COLUMN K AND L EDIT > COPY

13 WILCOXON BY HANDRISKY SHIFT Q2: Is the average level of risk recorded in the PRE assessment different from the risk recorded in the GROUP assessment? Wilcoxon testRATINGS + WITHIN Ss + 2 GROUPS 4) SORT COLUMNS K AND L BY COLUMN L (RANKED DIFFERENCES) DATA > SORT > SORT BY We are doing this as an easy way to rank order the data, but we also need to keep track of whether these differences are positive or negative in the final analysis. Hence, each individual difference keeps its unique id code.

14 WILCOXON BY HANDRISKY SHIFT Q2: Is the average level of risk recorded in the PRE assessment different from the risk recorded in the GROUP assessment? Wilcoxon testRATINGS + WITHIN Ss + 2 GROUPS 5) BEGINNING WITH THE FIRST NON-ZERO DIFFERENCE IN COLUMN N ASSIGN RANK SCORES STARTING AT 1

15 WILCOXON BY HANDRISKY SHIFT Q2: Is the average level of risk recorded in the PRE assessment different from the risk recorded in the GROUP assessment? Wilcoxon testRATINGS + WITHIN Ss + 2 GROUPS 6) SCORES THAT SHARE THE SAME NON-ZERO DIFFERENCE MUST SHARE AVERAGE RANK IN COLUMN P The first 11 numbers all share a difference of 0.4, so they are all assigned the rank value of 6 ( /11 = 6)

16 WILCOXON BY HANDRISKY SHIFT Q2: Is the average level of risk recorded in the PRE assessment different from the risk recorded in the GROUP assessment? Wilcoxon testRATINGS + WITHIN Ss + 2 GROUPS 7) TAKE THE SORTED ID VALUES FROM COLUMN K AND PASTE INTO COLUMN O 8) NOTE THAT IN COLUMN S, THE ORIGINAL SIGNED DIFFERENCES ARE ALREADY THERE

17 WILCOXON BY HANDRISKY SHIFT Q2: Is the average level of risk recorded in the PRE assessment different from the risk recorded in the GROUP assessment? Wilcoxon testRATINGS + WITHIN Ss + 2 GROUPS 9) SORT COLUMNS O AND P BY COLUMN O (ASCENDING) DATA > SORT > SORT BY

18 WILCOXON BY HANDRISKY SHIFT Q2: Is the average level of risk recorded in the PRE assessment different from the risk recorded in the GROUP assessment? Wilcoxon testRATINGS + WITHIN Ss + 2 GROUPS 10) COPY AND PASTE VALUES FROM COLUMN P OVER TO COLUMN U DATA > SORT > SORT BY

19 WILCOXON BY HANDRISKY SHIFT Q2: Is the average level of risk recorded in the PRE assessment different from the risk recorded in the GROUP assessment? Wilcoxon testRATINGS + WITHIN Ss + 2 GROUPS 11) REINSTATE NEGATIVE VALUES WHERE APPROPRIATE

20 WILCOXON BY HANDRISKY SHIFT Q2: Is the average level of risk recorded in the PRE assessment different from the risk recorded in the GROUP assessment? Wilcoxon testRATINGS + WITHIN Ss + 2 GROUPS 12) SORT COLUMN U (ASCENDING)

21 WILCOXON BY HANDRISKY SHIFT Q2: Is the average level of risk recorded in the PRE assessment different from the risk recorded in the GROUP assessment? Wilcoxon testRATINGS + WITHIN Ss + 2 GROUPS Congratulations! You now have everything you need to finish the test! SUM NEGATIVESUM POSITIVE No. NEGATIVENo. POSITIVE TOTAL OBSERVATIONS NOTE: This is exactly the same data produced by SPSS!

22 WILCOXON BY HANDRISKY SHIFT Q2: Is the average level of risk recorded in the PRE assessment different from the risk recorded in the GROUP assessment? Wilcoxon testRATINGS + WITHIN Ss + 2 GROUPS Congratulations! You now have everything you need to finish the test! SUM NEGATIVESUM POSITIVE No. NEGATIVENo. POSITIVE TOTAL OBSERVATIONS We use the smaller of the sums (33) as our observed W. We use the total number of non-zero observations (41) as our df. Look up the critical value of W, taking into account N. If our obtained W is smaller than the critical value of W, we reject the null hypothesis and conclude that two groups do differ significantly.

23 WILCOXON BY HANDRISKY SHIFT Q2: Is the average level of risk recorded in the PRE assessment different from the risk recorded in the GROUP assessment? Wilcoxon testRATINGS + WITHIN Ss + 2 GROUPS Obtained W = 33 Critical W = 89 N = 41 Obtained W < Critical W There is a statistically significant difference between the two groups Table only goes up to N = 25 but this is good enough (the critical value would be much bigger than 89 for an N = 41)


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