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Seminar 2 (2011) Data entry, analysis using SPSS and WoK.

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Presentation on theme: "Seminar 2 (2011) Data entry, analysis using SPSS and WoK."— Presentation transcript:

1 Seminar 2 (2011) Data entry, analysis using SPSS and WoK

2 Why do we need stats? Coin toss Birthdays Lady gaga 2

3 Can you toss a coin and get 10 heads in a row? (without cheating) Derren Brown: The Events: The System hhhw18

4 What if somebody offered to bet that at least two people in your in this class had the same birthday? Would you take the bet? 4

5 People UniqueProbability% % Daysnone the same with the same

6 Lady Gaga 6 Paparazzi Reversed mhQ mhQ Bad Romance (Misheard lyrics) - Lady Gaga jqVg jqVg

7 Why do we need stats? Coin toss…. Given a lager enough data set you can find the pattern you looking for. Birthdays …. We are bad a estimating probabilities. Lady gaga…. When we are primed we can see patterns. 7

8 Structure for this session Explain memory experiment from last week Input this data into SPSS Create the variable of interests using the COMPUTE function. Create statistics. Graph data Introduction on how to use Web of Knowledge for your literature search.

9 Group Remembering Last week you were ask to take part in an experiment in which you will view a series of 24 items list. You then were asked to recall words –Individually –In a group Participants with even module reference numbers were told they were in groups of 2. Participants with odd module reference numbers were told they were in groups of 5. However in the group recall condition participants were not in a groups all saw the same words recall.

10 What we are testing is whether recall improves when people believe are working in a group. We also wanted to see if perceived group size has an effect on recall.

11 Some questions about the group remembering experiment What are our independent variables here? What have we measured (i.e. what specifically is the dependent variable)? What possible issues are there with the experiment design?

12 Participants From the SPSS file we will find out The number participants in total and in each group. The number of males and females The average and range of the participants age.

13 Materials Target items were 4 lists of 24 unrelated words. List of words matched so they were all: – –Letters: 3-8 – –Syllables: 1-3 – –Familiarity ratings: Items were presented and recalled using a bespoke computer program. Items and trials were presented in a random order.

14 Design There were two IVs: 1. Within-subjects: Individual vs. group recall 2. Between-subjects: Perceived group size (2 or 5) The DV was number of words recalled. Order of conditions was counterbalanced across participants. The number of words “recalled” by the false group members was matched across group size

15 Procedure Participants were shown a list of 24 words. The list was presented for 1 minute. Participants had a 1 minute delay. In the individual recall condition, participants were then given 1 minute to recall as many words as possible on their own using an internet-based chat program. In the group condition, participants were told that they had been randomly assigned to groups of either 2 or 5 people who had to collaboratively recall as many words as possible in 1 minute using an internet-based chat program. In reality, each participant was recalling words alone, while a computer program simulated the other group members’ contributions of 8 items.

16 You need to create variables for: Participant ID: (Remember to select appropriate data ‘Type’) Gender : Values 0 = ‘Female’ and 1= ‘Male’. Age: Group size: Values 0 = ‘two people’ and 1 = ‘five people’. Individual score 1: Individual score 2: Group score 1: Group score 2: Go to “Variable view and enter in the variables you need. Complete questions 1 to 5 on the worksheet

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18 Mean score Use the COMPUTE function to create a new verbal called Mean Individual score. The new variable should be the average of Individual score 1 & Individual score 2 The new variable should be the average of Individual score 1 & Individual score 2 Now repeat the process to create a new verbal called Mean Group score

19 How to perform t-tests in SPSS Within-subjects t-test Between-subjects t-test T-tests are listed under ‘Compare Means’

20 How to do an independent-samples t-test using SPSS An independent-samples t-test involves comparing two different groups on a single dependent variable. Between-subjects t-test

21 Dependent variable (DV) goes here Independent variable (IV) goes here For the IV SPSS needs to be told what the label numbers are of the two groups we want to compare

22 22 Means and Std. Deviations of the two groups on the DV Are two rows for the t-test result. Only one row, defined by the result of the Levene’s test, is looked at If the significance for Levene's test is: greater-than (>).05 use the top row “Equal variables assumed”..05 or below (=<), then use the bottom row "Equal Variances not Assumed".

23 If the significance for Levene's test is 0.05 or below, then use the bottom row "Equal Variances not Assumed" test. Otherwise use the top row “Equal variables assumed”. Levene's test is greater than.05 therefore we need to use the top row. t=2.49 df=98 p=.015 There was a significant effect of perceived group size, t(98)=2.49 p=.015. Participants recall a grater number of items when they thought they were in a group of two (M=5.66, SD= 1.44) as apposed to a group of 5 people (M=4.92, SD=1.53)

24 If the significance for Levene's test is 0.05 or below, then use the bottom row "Equal Variances not Assumed" test. Otherwise use the top row “Equal variables assumed”. Levene's test is less than.05 therefore we need to use the bottom row. t=2.49 df=97.56 p=.015 There was a significant effect of perceived group size, t(97.56)=2.49 p=.015. Participants recall a grater number of items when they thought they were in a group of two (M=5.66, SD= 1.44) as apposed to a group of 5 people (M=4.92, SD=1.53)

25 How to do a paired-samples t-test using SPSS A paired samples t-test would allow us to compare the same participants performance on 2 variables Within- subjects t-test

26 Mean for individual scores Mean for group scores

27 Means (and SDs) for the two variables Mean difference between the two variables Standard deviation of the difference between the two variables t = Note: we ignore minus signs when reporting t values df=49 p <.001 p=

28 28 There was a significant effect of perceived group, t(99)=19.71 p<.001. Participants recall a grater number of items when they thought they were working on there own (M=8.93, SD= 1.18) as apposed to a group (M=5.29, SD=1.53) t=19.71 df=99 p<.001

29 We are going to stop for 20 min so you can work through questions 6-9 on the worksheet and have a break

30 Producing a Clustered bar chart 30 Choose summaries of separate variables Chose Clustered chart

31 Put the variables that you want to plot here Click to include error bars Put the variable that you want used to cluster the bars here

32 Edit your Graph

33 Structure for this session  Explain memory experiment from last week  Input this data into SPSS  Create the variable of interests using the COMPUTE function.  Create statistics  Graph data Introduction on how to use Web of Knowledge for your literature search.

34 Web of Knowledge A bit like Amazon for journal articles

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36 The main simple search page for Web of Knowledge (WoK) You can use the tabs as the top to select different Databases, e.g. Web of Science To Connect Web of KnowledgeTo Connect Web of Knowledge if you are off-campus you will need to use your ATHENS account.ATHENS account More information can be found on the library website. To Connect Web of KnowledgeTo Connect Web of Knowledge if you are off-campus you will need to use your ATHENS account.ATHENS account More information can be found on the library website.

37 You have to tell WoK which part (or field) of the record to search in I want to search for records on the topic of Dyslexia, how ever I don’t want to exclude records that have slightly different endings e.g. Dyslexic. So you put a * to represent unknown characters. WoK knows it is not the end of the word and I want to include any group of characters that follow Dyslex I want to search for records on the topic of Dyslexia, how ever I don’t want to exclude records that have slightly different endings e.g. Dyslexic. So you put a * to represent unknown characters. WoK knows it is not the end of the word and I want to include any group of characters that follow Dyslex

38 You can search in more than one field or add more than one search term You can also use this to exclude records by selecting NOT A good way to find a particular article in Web of Knowledge is: Use 1 or 2 words from the Title Use the name of 1 Author Search for the Year Published A good way to find a particular article in Web of Knowledge is: Use 1 or 2 words from the Title Use the name of 1 Author Search for the Year Published

39 This tells me what search I did to get the result This tells me how many results I have got You can sort your results by different factors here You use these options to narrow down your results further by selecting options (like eBay or Amazon), or searching with in your results. The numbers in brackets are how many results you be left with if you select that option You use these options to narrow down your results further by selecting options (like eBay or Amazon), or searching with in your results. The numbers in brackets are how many results you be left with if you select that option Endnote is a really helpful resource which you can go to a Library Training session on Endnote is a really helpful resource which you can go to a Library Training session on

40 Clicking in this Icon will tell you if you can get a copy of the article in full from Brookes Library This tells you who has cited the article This is where you can ask WoK to search for related results This is where you can see articles that are cited by this article

41 For the rest of the class use Web of Knowledge to answer the rest of the questions on the worksheet. Enter your answers in to the online form. On the psychology resources page for U24103 under Links Seminar 2 worksheet

42 For your practical report You should reference the 3 journal articles on the resources page. You also need to find and reference 2 relevant journal articles that have been published since 2002.


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