Causal research Flashcards
(30 cards)
What type of data do i need for cross tabs?
Nominal/ordinal VS a Nominal/ordinal variable
IF i have a Nominal/ordinal and must compare with RATIO, I must do a…
Compare means
IF i have a Nominal/ordinal and must compare with Interval, I must do a…
Compare means (semantic differential)
What if i have both Interval/ratio and Interval/ratio??
Correlation and REGRESSION
Meaning of Interval
Numbers with NO real ZERO
for example= degrees celsius
Meaning of Ratio
Numbers with real zero and you can do math
For example= age, height, weight, income
In crosstabulation, to check the significance between variables…
you must always do a chi squared test
When doing a chi squared test, i must ONLY look at…
Pearson chi squared
if the … is more than 0.05 then there is …
if the ASYMPTOTIC SIGNIFICANCE is more than 0.05 then there is NO DIFFERENCE
in the chi squared test, there is a clear difference IF
ALL THREE COMBINED
1. Significance is lower than 0.05
3. minimum expected count = more than 1
Cross tabs can only be done when you have two types of variables that are …
BOTH CODES
(Nom/ord and nom/ord)
When i do a compare means, how can i find the significant difference?
ANOVA Table
Correlation, when is there a strong correlation?
+1 = strong positive correlation
0 = no correlation
-1 = strong negative correlation
(Pearsons, different from crosstabs)
think correlation
If the significance level is
more than 0,05
There is no statistically significant
correlation
think correlation
if the significance level is less than 0,05
There is a statistically significant
correlation
How to perform a correlation analysis
ANALYZE -> CORRELATE -> BIVARIATE
to understand Pearsons better, pearsons …
tells you how strong and in which direction the relationship is
to understand the P-value (Sig. 2 tailed) better, p value ….
tells you whether the correlation is statistically significant
meaning pearson r
strength and direction
meaning P value (sig. 2 tailed)
Significance
To perform a compare means, i must
analyze -> compare means -> means
in a compare means, the dependent list you must add
Interval/ratio
in a compare means, in the independent list you must add
Nominal/ Ordinal
For cross tabs, if you want to make a graph, ALWAYS ….
Clustered bar chart & summaries of groups and cases