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# Forum: Statistical Research

Statistical theory and methodology. Mathematical statistics. Parametric inference. Nonparametric inference.

1. ### Sticky: Proof of the day

In this thread we post one (or more if you can't wait) proof a day. I'll start by proving the that V=\sigma^2(X'X)^{-1} in the linear...

• Replies: 14
• Views: 18,620
10-11-2014, 12:02 PM
1. ### Test for difference between ratio of means, unequal variance.

Hello there, I an experimental design were I wish to test if the effect of a treatment on several subjects type is different to the effect of...

• Replies: 5
• Views: 6,199
09-29-2015, 11:58 PM
2. ### Non normal likert scale Data?

Hello all, I have a problem with stats procedures for a research paper. I have a sample size of 379 respondents with data collected with a 5...

• Replies: 5
• Views: 10,280
Laf
11-12-2012, 04:03 AM
3. ### Simple question

Hello everyone.. This is my first post here, and I really think it's a great idea to have such forum.. Anyway, I have a simple question I...

• Replies: 5
• Views: 2,031
08-02-2012, 05:22 PM
4. ### Is a z-transformation appropriate in this case?

Hi everyone :-) n=150 Everyone gets a test with 14 items and a variable "score" is calculated from the responses. Trouble is, 50 of my tests...

• Replies: 5
• Views: 1,770
08-24-2012, 08:45 AM
5. ### Using Mann-Whitney test when all values in one data set are zero (SPSS vs Graphpad)

I would be very grateful for advice on the following problem: I am examining the frequency in which political issues are reported in the national...

• Replies: 5
• Views: 2,673
08-29-2012, 03:50 AM
6. ### Cca

Hello In CCA is it a must that the number of IV's to be less than or equal the number of DV's,i mean are there any assumptions or conditions about...

• Replies: 5
• Views: 2,006
09-30-2012, 02:32 AM
7. ### Paired t-test is significant and ANOVA is not, on what should I rely?

Hello.. I have a question I hope someone can help me with. In my study, I have to groups; treatment group and a control (placebo) group, and I...

• Replies: 5
• Views: 1,899
11-11-2012, 10:05 AM
8. ### Wich data analysis to choose for my data?!

Hello to everyone, I'm new on this forum and I thank the team for this site. Actually I'm working with some data and I don't know which can be the...

• Replies: 5
• Views: 1,761
11-13-2012, 09:40 AM
9. ### Customer satisfaction survey (data analysis)

Hi, We are doing a customer satisfaction survey on our school canteen. We are finished with the data collection and is now considering what...

• Replies: 5
• Views: 3,173
11-28-2012, 02:13 AM
10. ### multivariate logistic regression

I want to do multivariate logistic regression. Does it mean "one logistic regression with 2 dependent variables at the same time? Or Does it mean...

• Replies: 5
• Views: 3,237
szm
06-16-2013, 01:46 PM
11. ### statistical analysis- ANOVA, t test, questionnaire

Hi all, I am doing a mini research in HCI filed which examine the differences between pen touch and finger touch on specific Smartphone. I have...

• Replies: 5
• Views: 3,369
02-04-2013, 04:44 PM
12. ### non-parametric t-test with mean/SD = 0

Hi All, quick question on non-parametric t-test I have 2 groups. 7 values each. Group One= 0, 0, 0, 0, 0, 0, 0 which of course is mean=0 and...

• Replies: 5
• Views: 3,517
02-05-2013, 11:24 PM
13. ### ANOVA help? :)

Basically i have two sets of data collected from two different locations. I know that both sets of data are not normally distributed, so they will...

• Replies: 5
• Views: 1,115
02-13-2013, 05:32 PM
14. ### pair-wise comparison using contrasts

I asked this question months ago, and did not get a response. So hopefully, someone can help me out here. Here, I am running a 2way repeated...

• Replies: 5
• Views: 1,423
05-15-2013, 11:54 PM
15. ### Writing equations for latent growth curve models

Hi all, I'm a PhD student currently working on an independent research project using latent growth curve modeling. This is my first time using...

• Replies: 5
• Views: 2,079
06-01-2013, 02:11 PM
16. ### How to test this mix of continuous and categorical data?

Hello all. I'm working on this project and have the following variables: x (categorical, independent) y (continuous,independent) z...

• Replies: 5
• Views: 1,143
07-02-2013, 08:56 PM
17. ### Logistic regresion with only discrete IV

Hi, I saw a few binary logistic regressions in Minitab where we did not have any continuous variables and the analysis Minitab gave was simply the...

• Replies: 5
• Views: 3,601
08-03-2013, 02:29 PM
18. ### Permanova design for BACI study (using Primer)

my first question here! i need to do a few analyses on a biological dataset, and I am a bit puzzled about how to set my Permanova design. I use...

• Replies: 5
• Views: 3,150
08-09-2013, 03:51 AM
19. ### T-Test vs. Mann-Whitney U Test for ordinal data

• Replies: 5
• Views: 17,782
08-21-2013, 05:29 AM
20. ### Sturges' Formula

How can I prove Sturges' formula for determining number of classes in frequency distribution? k=Log2n+1 (n=number of data, k=number of classes)

• Replies: 5
• Views: 30,696
09-27-2013, 12:01 PM
21. ### Permanova significant four fold interaction. How about 2 and 3 fold interactions?

Dear, I have a problem considering the analysis of a design with 4 factors. I have a fully crossed design with 4 factors (Su,Sp,Sa,Te). When...

• Replies: 5
• Views: 1,707
09-26-2013, 06:09 PM
22. ### geometric argument for constraints on r_xz given r_xy and r_yz

Today a labmate asked the following question: if we have three random variables x, y, z, and we know the correlations r_{xy} and r_{yz}, what...

• Replies: 5
• Views: 4,021
05-18-2015, 04:16 PM
23. ### A simple case that doesn't seem that simple

I've been trying to find the best solution for my experiment. I don't like that much what my colleagues are using for the statistic test here. So I...

• Replies: 5
• Views: 2,068
srd
12-02-2013, 10:34 AM
24. ### question on Monte Carlo simulation

I have a mean (mu) and its standard error (se) of variable X from the literature. I have a dataset of size n which doesn't have variable X. Now I...

• Replies: 5
• Views: 1,910
11-27-2013, 08:17 AM
25. ### No Standard Deviation

Hello statistical geniuses, I have 450 items and I want to test a sample and be sure with 95% confidence that if all of my tested items are...

• Replies: 5
• Views: 1,796
01-13-2014, 04:00 PM
26. ### What to do if sample size is too big? (ttest)

So I'm running ttests for a descriptive statistic table and all my results are significant, but I"m concerned that the sample size is too big 3,880...

• Replies: 5
• Views: 6,062
02-01-2014, 05:47 PM
27. ### Basic question on Spearman's correlation coefficient

Hey guys, If I understand correctly, when calculating Spearman's correlation coefficient you just rank your variables, and then calculate...

• Replies: 5
• Views: 1,272
02-24-2014, 01:37 PM
28. ### Two IV's (Nominal, both multi-level), One DV (Interval). What do I run????

Help needed, I am trying to escape ABD hell. I am only a couple of statistical procedures away from slaying the dissertation beast and have hit a...

• Replies: 5
• Views: 2,206
02-27-2014, 03:15 PM
29. ### Correlation coefficient repeated measures

Hi Everyone, I would like to measure the correlation between two quantitative variables. These variables measure the same thing but are obtained...

• Replies: 5
• Views: 2,920
03-26-2014, 04:17 AM
30. ### structuring a proof

I am working on a problem to show that the non central f distribution is a generalization of the f distribution. I understand this conceptually but...

• Replies: 5
• Views: 1,686
04-08-2014, 10:12 AM
31. ### Bayes statistics - sensitivity to priors

Hi, I came across a statement in a review of a research field, where they were determining an unknown parameter using Bayesian statistics. The...

• Replies: 5
• Views: 2,144
06-22-2014, 01:53 AM
32. ### Effect size for small non-parametric data

Hi Guys, I would like to run a effect size test for a very small non-parametric analysis (n=4 per group), which one is the most recommended test?...

• Replies: 5
• Views: 3,089
06-30-2014, 06:25 PM
33. ### Can you assign new observations into existing clusters?

Have never done cluster analysis. Is a scenario like this possible/recommended... 1. Run 100 observations thru cluster analysis and end up with 4...

• Replies: 5
• Views: 3,787
07-07-2014, 03:45 PM
34. ### Is there a test...

Hi there! I have a new work project and I'm finding it challenging to select the approriate test. I'm not even sure if the right test exists so...

• Replies: 5
• Views: 1,809
07-23-2014, 10:54 PM
35. ### factor analysis

Can I do a factor analysis with one dependent variable and one independent variable? Do I need to have at least two dependent variables to do a...

• Replies: 5
• Views: 1,170
07-29-2014, 09:02 AM
36. ### State the null and alternative hypothesis

Dear all, Can someone please give me some advise on this one? I need to state the Ho en Ha hypothesis, I know how to do it in words but not in the...

• Replies: 5
• Views: 4,527
11-16-2014, 01:09 PM
37. ### Sample size help!!

Hello! New to the forum but would greatly appreciate any help people may have to offer... Essentially I am trying to organise a scientific study...

• Replies: 5
• Views: 2,813
11-17-2014, 03:53 PM
38. ### Which analysis i should use to test/support hypothsis ?

Hello Can someone tell me which type of analysis I should use to test hypothesis ? Which analysis best show me measure between 2 constructs ?

• Replies: 5
• Views: 1,814
12-01-2014, 11:49 PM
39. ### Accept Null hypothesis VS Reject Null hypothesis ?

• Replies: 5
• Views: 4,035
12-03-2014, 05:38 AM
40. ### Over-simple Stats?

Hi all, This should hopefully be a really simple question but I think I am confusing myself over a throwaway comment that someone made.... Say...

• Replies: 5
• Views: 1,449
01-15-2015, 09:16 AM
41. ### GIS data questions

Hi All, I have to get some GIS data for a project I am working on but I honestly have no idea where to start. What I need is as follows: 1. I...

• Replies: 5
• Views: 1,051
06-18-2015, 11:21 AM
42. ### post-hoc for nonparametric paired data in groups of unequal sizes

I am trying to do post-hoc analysis for nonparametric data. The group sizes are unequal but are paired. I've found several tests online,...

• Replies: 5
• Views: 2,294
07-22-2015, 09:54 AM
43. ### advice on how to proceed

Hello, I recently undertook to analyze a relatively simple data set. It includes estimates of tree species composition for several sites within...

• Replies: 5
• Views: 1,805
11-10-2015, 12:37 PM
44. ### paired samples

Hello! I have two separate group. On each group, I could have done paired samples t-test, but I want to compare between the two of them- is there...

• Replies: 5
• Views: 1,570
12-21-2015, 01:06 PM
45. ### probability formula

Hello, I would like to know the formula that would allow me to do the following; Assume; 1. 200 total events occur in 100 days (ie; 2 events per...

• Replies: 5
• Views: 1,372
01-16-2016, 02:47 PM
46. ### Anova

I am trying to find the effects of feed rate, cutting speed and depth of cut on surface roughness. I have five sets of feed rate ( 0.09, 0.10, 0.125,...

• Replies: 5
• Views: 2,545
02-29-2016, 06:07 AM
47. ### Models comparison

I have a time series data of 1000 points for each of the different machines. I tried different forecasting techniques to make a one step prediction....

• Replies: 5
• Views: 1,852
03-15-2016, 06:44 AM
48. ### Which Non-parametric Significance Test Should I Use?

Hi, I've been working on a little project. Last year I delivered pizzas. I recorded data for 300 of my deliveries like tip amounts, order totals,...

• Replies: 5
• Views: 2,039
06-09-2016, 02:34 AM
49. ### Dealing with missing values in cluster analysis

I am currently looking for a cluster algorithm to deal with a large amount of systematically missing values. In particular, I need to cluster...

• Replies: 5
• Views: 1,146
07-16-2016, 06:53 AM
50. ### Can I use gls if I don't need to use mixed models and var is not structured?

I have a continuous variable that is related to a covariable linearly. I need to compare this relationship between months (24 months), but the...

• Replies: 5
• Views: 1,750
09-14-2016, 04:01 PM
51. ### Item Response Question

I have received some survey data for 200 respondents. DV: Binary (20=1; 180=0) 20 IVs, Likert 5-point scale and currently treated as...

• Replies: 5
• Views: 2,608
11-14-2016, 03:21 AM
52. ### Propensity score matching - pre-treatment outcome variable

Hi all, maybe this rather a silly question but I have not found anything helpful. I have two groups of samples which are basically a treatment and...

• Replies: 5
• Views: 3,535
12-05-2016, 03:20 PM
53. ### What kind of tests i can do to see if two diseases are related

I am using data from this website (data is at the bottom of the page) for a case-study. For the sake of question lets stick to any of FluWatch sheet...

• Replies: 5
• Views: 3,129
11-22-2016, 02:02 PM
54. ### Maximum number of groups in Kruskal Wallis one-way analysis of variance

Is there a maximum number of groups in Kruskal Wallis' one-way ANOVA? I am looking at a data set with 42 separate groups and I am unsure if there...

• Replies: 5
• Views: 2,832
01-12-2017, 07:14 PM

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