College aantekeningen
College aantekeningen MTO-B MAW: Inleiding Statistiek
- Instelling
- Tilburg University (UVT)
Stap voor stap de colleges van SPSS opgeschreven. Mag je bij je tentamen er naast houden.
[Meer zien]Voorbeeld 2 van de 12 pagina's
Voorbeeld 2 van de 12 pagina's
In winkelwagengesponsord bericht van onze partner
Voorbeeld van de inhoud
Spss collegesInhoud
1. Data-handling en descriptive statistics...............................................................................................2
1.2 descriptive statistics......................................................................................................................2
1.3 Missing values...............................................................................................................................2
1.4 computing variables (nieuwe variabelen).....................................................................................3
1.5 recoding variables.........................................................................................................................4
1.6 entering data create data-file......................................................................................................4
2. Syntax en T-test..................................................................................................................................6
2.1 introduction to syntax..................................................................................................................6
2.2 data handling using syntax...........................................................................................................7
2.3 one-sample T-test (1)....................................................................................................................8
2.4 one-sample T-test (2)....................................................................................................................8
2.5 bonus............................................................................................................................................8
3. T-test & correlation/association.........................................................................................................9
3.1 independent samples T-Test.........................................................................................................9
3.2 paired samples T-Test...................................................................................................................9
3.3 correlations.................................................................................................................................10
3.4 Chi2Test......................................................................................................................................11
What do people think is the most important factor of job satisfaction, and is this related to
whether or not they have flexible working hours?...........................................................................11
, 2
1. Data-handling en descriptive statistics
1.2 descriptive statistics
Descriptive statistics are values that give us an impression of what the data look like as a whole. Examples
of descriptive statistics are the mean, standard deviation, and frequencies.
Histogram maken:
- Navigate to Graphs → Legacy Dialogs → Histogram
- Make sure to check the box 'Display Normal Curve'.
- Click 'Ok' to run the analysis.
Next up is to generate a table with descriptive statistics.
Navigate to Analyze → Descriptive Statistics → Descriptives
Add the variable SATIS and OPTIM to the 'Variable(s)' box.
Click on “Options” and check the box “Variance”.
Click 'Ok' to run the analysis.
Besides getting an overall impression of the data, another reason to look at the descriptive statistics is to
see if there are any errors in the data file, such as answers that are outside the range of expected values.
In descriptives kijken naar min en max score.
To find these, you can sort the data file by a variable.
Navigate to Data → Sort Cases
Put the variable OPTIM in the 'Sort by' box.
If you find a strange value, you may select the whole row and delete it.
Now that we’ve “cleaned” the data file, it’s time to answer your first research question!
The question is: “Are non-smokers more satisfied with their life than smokers?”
To answer this question, we first have to split the participants into two groups: Smokers and Non-smokers.
Navigate to Data → Split File → Compare Groups
Select 'compare groups' and put the variable SMOKE in the box
1.3 Missing values
In het frequency table van een variabele kun je de missende waarden vinden.
Note that the values in the columns “Percentage” and " Valid percentage" differ. This is due to these
missing values!
“Percentage” is obtained by dividing the observed frequency by the total N (including respondents
with a missing value), whereas “Valid Percentage” is obtained by dividing the observed frequency by the
number of respondents with a valid score (thus, excluding the persons who had a missing value).
You could also calculate these percentages by hand by using the frequencies given in the first
column. You might want to try this for some of the (valid) percentages to get more insight in the table.
Flag question: Spacer
In the current dataset, the missing values are just empty cells. SPSS sees the empty cells as so called
“system missing”. It simply tells us that data in these cells are missing.
Although this may work for now, a better strategy is to use codes for the missing values. For example, we
may code our current missing values by 999.
Proceed as follows:
1. Go to the data view, and fill in the value 999 for the missing values on the variable stress.
(You may want to use the “sort cases” option to find the missing values faster.)
Voordelen van het kopen van samenvattingen bij Stuvia op een rij:
Verzekerd van kwaliteit door reviews
Stuvia-klanten hebben meer dan 700.000 samenvattingen beoordeeld. Zo weet je zeker dat je de beste documenten koopt!
Snel en makkelijk kopen
Je betaalt supersnel en eenmalig met iDeal, creditcard of Stuvia-tegoed voor de samenvatting. Zonder lidmaatschap.
Focus op de essentie
Samenvattingen worden geschreven voor en door anderen. Daarom zijn de samenvattingen altijd betrouwbaar en actueel. Zo kom je snel tot de kern!
Veelgestelde vragen
Wat krijg ik als ik dit document koop?
Je krijgt een PDF, die direct beschikbaar is na je aankoop. Het gekochte document is altijd, overal en oneindig toegankelijk via je profiel.
Tevredenheidsgarantie: hoe werkt dat?
Onze tevredenheidsgarantie zorgt ervoor dat je altijd een studiedocument vindt dat goed bij je past. Je vult een formulier in en onze klantenservice regelt de rest.
Van wie koop ik deze samenvatting?
Stuvia is een marktplaats, je koop dit document dus niet van ons, maar van verkoper ilvademeijer. Stuvia faciliteert de betaling aan de verkoper.
Zit ik meteen vast aan een abonnement?
Nee, je koopt alleen deze samenvatting voor €6,99. Je zit daarna nergens aan vast.
Is Stuvia te vertrouwen?
4,6 sterren op Google & Trustpilot (+1000 reviews)
Afgelopen 30 dagen zijn er 53340 samenvattingen verkocht
Opgericht in 2010, al 14 jaar dé plek om samenvattingen te kopen