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Threads 421 to 480 of 3209

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: 19,435
10-11-2014, 12:02 PM
1. Simple or Factorial Experiment Could I Chose?

Dear, friends, scientests, and researchers I conducted an experiment to study two factors, first was irrigation method (I) which consisted 2...

• Replies: 1
• Views: 1,362
12-28-2015, 09:00 AM
2. what does rejecting the hypothesis mean

Hi, so I'm new to statistics and am not very comfortable with it yet. It may be a very simple question, but I'm finding this very difficult to...

• Replies: 0
• Views: 830
12-28-2015, 06:34 AM
3. Bayesian parameter estimation via MCMC?

Hi folks. I have the following question. I have a model M containing 20 adjustable parameters k = {k_j}. I also have 40-50 measured...

• Replies: 2
• Views: 1,818
12-26-2015, 02:34 AM
4. Which Tests to applicate for Trends?

Hi everyone, it's christmas time again, which for me means, some free time :) During my free time I looked to acquire a bit more knowledge in some...

• Replies: 2
• Views: 1,580
12-23-2015, 12:49 PM
5. 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: 1,642
12-21-2015, 01:06 PM
6. Enrichment / over-representation of pairs, triplets, quadruples, etc.

Due to a lack of interest from users for over a month I would like to delete this thread.

• Replies: 0
• Views: 917
12-19-2015, 04:01 PM
7. How to compare whether younger patients have better therapeutic results ?

Hi, I've just finished a research on 30 patients. Age range was 26 to 80. I've tested everyone of them before and after the treatment. Results are...

• Replies: 1
• Views: 933
12-19-2015, 10:07 AM
8. Which Test for Comparing a Group Pre and Post

A group of people have participated in a program That group of people have completed a questionnaire pre and post program Because it is a...

• Replies: 3
• Views: 2,046
12-18-2015, 07:30 PM
9. Multiple testing?

Hi all, I have a question about some analyses that I did. I examined a large hospital admissions data set and the data were grouped by areas 1, 2,...

• Replies: 7
• Views: 1,764
12-18-2015, 10:54 AM
10. Sample Size Selection

Hi All I am having trouble with a sample size selection. I would like to run a study on the following applications to a program and record how many...

• Replies: 3
• Views: 2,209
12-12-2015, 09:28 PM
11. APA report format

I have performed the Welch ANOVA due to the violation of homogeneity of variance. The df shown in spss is (2,164,078) Should I report this value,...

• Replies: 0
• Views: 1,118
12-12-2015, 08:21 AM
12. [SAS] Compare predicted vs actual continuous [0,1] data

Hello, I have predicted values for year and quarter that were calculated from a linear regression, and I also have actual values. I would like to...

• Replies: 1
• Views: 2,477
12-08-2015, 08:01 PM
13. Violating the assumption of normality and homogeneity of variances. How to report?

I am trying to run One way ANOVA but after trying to test these two assumptions, I found that the data violated the assumptions. I am now trying...

• Replies: 2
• Views: 2,452
12-06-2015, 08:41 AM
14. structural zeros and chi square

Hello, I have been reading a little bit about structural zeros and chi-square goodness of fit tests. I've not been able to find a clear answer...

• Replies: 2
• Views: 3,020
12-05-2015, 03:48 PM
15. comparing models

This might be a "101" question but hey, The Ecologist" encouraged me to ask questions , lots and lots of stupid questions. So when I have two...

• Replies: 7
• Views: 2,516
12-04-2015, 10:26 PM
16. How should I further analyse this result?

• Replies: 4
• Views: 2,232
12-04-2015, 04:05 AM
17. Need help determining proper test, im confused

Describe relationship between mother and father's education. I recoded each into three levels. I think it is spearman rho, but second part of...

• Replies: 2
• Views: 1,719
12-04-2015, 04:00 AM
18. disregard post, need 5 posts to pm someone

Random stuff to get 5 posts

• Replies: 2
• Views: 1,066
12-04-2015, 02:23 AM
19. correlation matrix: Bonferroni or not Bonferroni is my question

Hello all, When constructing correlation matrices, a number of people claim that one should apply the Bonferroni adjustment if the number of...

• Replies: 4
• Views: 1,508
12-03-2015, 08:50 PM
20. How to fix mistake of changing psychometric seven point scale to a five point scale?

:shakeheadHi my first research project uses 3 psychometric scales which have all been peered reviewed as valid & reliable. I mistakenly thought it...

• Replies: 2
• Views: 1,507
12-03-2015, 11:35 AM
21. Trying to find MS Excel Wilcoxon Rank Sum test example

I am a pharmacy student doing a 4th year (final year) Capstone Research Project. I am attempting to run my data utilizing a Wilcoxon Rank Sum Test...

• Replies: 1
• Views: 1,359
12-01-2015, 08:55 PM
22. [wilcoxon/paired t test] when to exclude data? Not normally distributed data.

Hello! I ran an analysis of my data of research into a repeated measures design and found the difference of both conditions to be not normally...

• Replies: 1
• Views: 1,396
11-28-2015, 08:10 AM
23. Identifying relevant predictors and interactions

I have a data set comprising of 12,000 observations and 1,100 potential predictors (continuous and nominal) for a binary outcome/target variable. ...

• Replies: 0
• Views: 960
11-23-2015, 05:57 AM
24. Help understanding results of this radomized controlled trial.

In the following published paper linked to below, could someone explain the meaning of this quote: Link to publication that the quote is from:...

• Replies: 2
• Views: 1,401
11-22-2015, 10:20 AM
25. binary choice with fisheries data over time

Hi all, I am new to the forum so please bear with me if I am not following protocol in my post. I have fisheries data which is vessel specific....

• Replies: 4
• Views: 1,565
11-19-2015, 02:19 PM
26. Testing Model Fit between Subsets of Data When Using Multilevel Models

When using multilevel models based on maximum likelihoods, one can use either deviance statistics (e.g., -2LLs) for nested models or information...

• Replies: 0
• Views: 1,155
11-18-2015, 03:49 PM
27. Multiple measurement time series

Hi dear helper, I have a collection of monitoring data which I want to analyze as to significant differences over time. I have monitored 2 groups...

• Replies: 2
• Views: 744
11-17-2015, 08:43 AM

I have two questionnaires I want to correlate. One questionnaire has all the questions with answers from 1 to 5, I can make a mean out of that...

• Replies: 2
• Views: 1,041
11-17-2015, 06:09 AM
29. Do you need to standardise data before running MCA?

I have both ordinal and categorical data and am attempting to perform a Multiple correspondence analysis. My question is if a dataset contains a...

• Replies: 1
• Views: 1,413
11-17-2015, 05:24 AM
30. How to differentiate between a global and a local method?

Hello, I am trying to write a report based on prediction models and my topic requires me to cover one global method(regression for example) and a...

• Replies: 0
• Views: 1,585
11-16-2015, 07:01 PM
31. Cronbach's alpha and Cohen's Kappa (CA & CK)

Is there any effective difference between CA and a weighted-CK? Anyone any thoughts?

• Replies: 2
• Views: 11,227
11-15-2015, 04:32 PM
32. Justification for running an ANOVA after receiving non significant results on MANOVA

Hi I ran a MANOVA model, with 2 DV's (2 groups of adolescents) and 1 IV with 3 categories ("strategies"). I got a non significant result, with P....

• Replies: 0
• Views: 1,395
11-15-2015, 06:17 AM
33. How to Identify Change from Initial Values in Time Course Data

Hello, I am currently working on my Masters Thesis and am trying to figure out a way to determine when my data is different or not from the...

• Replies: 0
• Views: 992
11-14-2015, 11:09 PM
34. Is AR(1)-ARCH(1) covariance stationary?

I'm becoming confused by this. Say I have the following model: I know that an AR(1) is covariance stationary if |\phi|<1. I also know...

• Replies: 1
• Views: 2,031
11-14-2015, 07:29 PM
35. What type of test should I use?

I am trying to determine whether being involved in an extracurricular activity has an impact on different course grades (dependent variable),...

• Replies: 2
• Views: 1,302
11-14-2015, 04:39 PM
36. log likelihood function ARMA

To derive the log-likelihood function of an MA(1) we condition on \epsilon_0 . But when deriving the log-likelihood function function for an AR(1)...

• Replies: 1
• Views: 839
11-14-2015, 04:30 PM
37. How should I explain this results?

The hypothesis is: the willing-to-pay is higher when people see print ad with testimonial. So there are four print ads 1. 1 cola ad with...

• Replies: 4
• Views: 1,691
11-14-2015, 01:34 PM
38. Theory of p value matching????

I am required to write about this for my lit review. I asked the stats lecturer but he said he never heard of it! could anyone hazard a guess to...

• Replies: 7
• Views: 1,731
11-13-2015, 02:25 PM
39. Hybrid Network Inference

I'm trying to figure out how to calculate the result mean and variance for a simple hybrid bayesian network comprised of 2 variables (to keep things...

• Replies: 0
• Views: 1,207
11-12-2015, 09:30 AM
40. 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: 1,931
11-10-2015, 12:37 PM
41. Confidence intervals in population-based study?

Hello everyone, I have a question that might be quite simple. I'm planning a population-based study with very basic statistical analyses (mostly...

• Replies: 1
• Views: 1,818
11-09-2015, 11:56 AM
42. Calculate chance level in multiple choice

Hello everyone. In short: I would like to know how to compute the chance-level of an 8-alternative multiple choice questionnaire with 6 questions....

• Replies: 0
• Views: 2,649
11-08-2015, 07:27 AM
43. statistical test confius

hii... any one need to help me... currently im doing research about pollution.. can any one suggest what test can i do since i using questinnaire...

• Replies: 3
• Views: 1,447
11-06-2015, 06:33 PM
44. Trouble with 3D geometric morphometrics/PCAs

Hi all, I've been doing some 3D shape analyses using landmarks and analysed the resulting data using PCAs. I'm not very familiar with all this so...

• Replies: 0
• Views: 1,152
11-05-2015, 05:52 AM
45. Multivariate generalization of Poisson-Gamma model?

Hello! I actually assumed it would be easy to find a multivariate version of the Poisson distribution, but couldn't find any concrete solution (in...

• Replies: 0
• Views: 1,353
10-29-2015, 08:01 AM
46. sample size for repeated measures

Greetings everyone, a friend needs some stats help on her doctoral thesis. She is conducting a longitudinal, follow up, study on the same...

• Replies: 0
• Views: 1,378
ivn
10-29-2015, 02:41 AM
47. ANOVA - which one to use?

Hello, we are doing an experiment where body consistence (weight, proportion of muscles, fat, water in body etc.) is measured. We have 103...

• Replies: 3
• Views: 1,778
10-28-2015, 02:38 AM
48. Kruskal-Wallis or Poisson regression for parasite count data?

Trying to figure out how best to carry out this analysis... So essentially I have four different species of Deer mice, infected with a high, medium,...

• Replies: 4
• Views: 1,643
10-27-2015, 05:28 PM
49. Dropping observation

Hello I am too embarrassed to ask it as it looks very easy but I did not find answers to it and I tried hard. I have a sample of 5000...

• Replies: 1
• Views: 2,146
10-26-2015, 07:47 PM
50. How do I use PERMANOVA/interpret the results

I am doing this research project comparing the snail community across two species of sea grass. Ten sample quadrats were collected from each sea...

• Replies: 1
• Views: 3,508
10-24-2015, 07:52 AM

I work for a company that sells products online. I am attempting to create a common sense SOP for our email marketing campaigns and have plenty...

• Replies: 8
• Views: 2,134
10-22-2015, 05:22 PM
52. ANOVA or Correlational analysis? Which one to use?

Hello everyone, I am currently working on my dissertation and aim to identify the relationship between parent-child interaction and behavior of...

• Replies: 4
• Views: 1,793
10-22-2015, 06:35 AM
53. Statistical analysis on redistricting and women in office; sample size, ideas??

Okay. I have this huge paper that I've been working on for umpteen thousand years. I really need to graduate from college. The question: how does...

• Replies: 0
• Views: 1,075
10-20-2015, 06:24 AM

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