# assumptions

1. R

### Determining ideal sample size, testing normality in SPSS, bonferroni adjustment

Hello all, I am new to the forum. I had a bit of training in statistics and research, particularly statistics in psychology, but I have some basic questions that are holding me back. I would appreciate the help. 1. How can I determine the ideal sample size for a study (upper and lower...
2. ### Help with the statistics solving

Violations 0 0 1 2 3 4 5 >5 Fine A$1000 0 0 10 10 10 20 50 (Please note from the table that 0 violations = 0 fines, 1 violation = 0 fines, 2 violations =$10,000 fine, 3 violations = $10,000 fine, 4 violations =$10,000 fine, 5...
3. ### Picking the correct test, need help urgently!

Hello, I feel like the answer for this is probably really obvious but I am being missing it altogether. This is my data: Habitat Associating Not Associating Total Observations Flood 51 0 51 Levee 524 72 596 Liana 162...

Hi, I would really appreciate some help with this. I am looking to see if employees' organisational history (such as voluntary/involuntary turnover) and their contract type (part or full-time) impacts on their organisational commitment and empowerment. So I have 2 Dependent Variables...
5. ### URGENT: Two-Way Anova or Regression

Hi, I would really appreciate some help with this. I am looking to see if employees' organisational history (such as voluntary/involuntary turnover) and their contract type (part or full-time) impacts on their organisational commitment and empowerment. So I have 2 Dependent Variables...
6. ### What is model adequacy checking in anova?

In anova, we assume that the random error term \epsilon_{ij} is independent and identically distributed with mean 0 and variance \sigma^2 How can I check the normality assumption and independence assumption? Does model adequacy checking mean "Checking the normality assumption that...
7. ### Assumptions of an ANOVA

1. I could google this but in my past searches I get conflicting stuff and wrong stuff. So I'll state what I think are the assumptions of ANOVA & their meanings and ask you all to add or critique. I'm taking this from Cohen, Cohen Aiken and West a) Correct specification of the form of the...
8. N

### multinomial logistic regression - assumptions violated?

Hi everybody :) I ended up asking a few questions in another thread that however didn't have a matching title, which probably explains why nobody replies. Since it's really important for me to understand, I am reposting my questions in this new thread with a matching title... and hope someone...
9. ### [Statistical Assumptions] Do elite samples violate assumptions?

If you have millions of dollars, please respond. Thanks for your attention & feedback.
10. ### [Paired T-Test] Assumptions & Violations

poor design methods
11. ### When to assume Normality

I am working with a rather large sample (approximately 120). Typically, I would not have any issues justifying normality due to the large sample size and that the Central Limit Theorem would allow me to make that justification. However, of the 120 or so samples, there are about 8 extreme...
12. ### Normality Assumption

Say there is 100 observations, but these observations are equally broken into 2 genders and 5 cities. When creating a qq plot or just checking normality by the S-W statistic, can the 100 observations be tested all at once or does the data need to be broken out by genders or even the five cities?
13. ### SEM - assumption of independence?

Hello Can someone confirm for me that general uses of structural equation modeling require meeting the assumption of independent observations --- in other words one subject/case cannot generally provide more than one response for any given measured variable...? For example, if one...
14. ### chi-square assumptions with survey data

Hi guys, I've been asked to run some analyses on some survey data and since it's been a long time since i ran one, I just wanted to check I'm not overlooking some assumptions assoicated with the chi-square test of independence as the text books I've been referring to are quite basic. The...
15. ### How important are the assumptions of ANOVA??

I am doing some research on the impact of retention harvesting on soil nutrients and have been told by someone at my work that I do not have to test my data for normailty or homogeneity of variance because I have many replicates. Data was collected over three different years. The first year was...