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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: 18,616
10-11-2014, 12:02 PM
1. ### How to create sampling weights?

Hi all, I'll go directly to the point, and then try to clarify: How do I create reliable weights for a sample, that take account of the number...

• Replies: 2
• Views: 2,536
10-23-2012, 09:21 AM
2. ### What experimental design would be most appropriate?

In my study I have two study groups: Group A is composed of X subjects which are either males or females, and every subject is characterized by...

• Replies: 0
• Views: 2,535
11-11-2016, 03:40 PM
3. ### Statistical significance on financial ratios

Hello! I am currently trying to determine whether or not the implementation of IFRS has had a statistically significant effect on the return over...

• Replies: 0
• Views: 2,534
12-10-2010, 10:38 PM
4. ### unusual contrast in 2x2 mixed ANOVA

A friend of mine sent me the following question this morning. I gave the best advice that I had, but I was curious to hear alternative feedback from...

• Replies: 0
• Views: 2,534
10-06-2011, 10:30 PM
5. ### Practical question about Page's L test

I have a k number of 77. Unfortunately the table I've obtained only goes to 10. :shakehead... How can I otherwise calculate the Lcrit? Thank you

• Replies: 0
• Views: 2,533
12-03-2011, 04:05 PM
6. ### A basic question. Pls help...

Hi, When discussing the large sample theory, the professor in my econometrics course said sth that I found hard to grasp. He said something...

• Replies: 1
• Views: 2,532
06-15-2009, 08:07 PM
7. ### Wilcoxon rank sum test on Cross Validation Results

Hi Guys, I would like to compare the recognition times of two different object detectors. I have let's say 1000 labeled data. Then I do a 10x...

• Replies: 2
• Views: 2,532
01-31-2012, 03:33 AM
8. ### How to obtain standard deviation of replicate experiments?

I have been searching in books, fora and articles but I can't seem to find a clear cut answer to the following question: I ran two experiments...

• Replies: 0
• Views: 2,531
01-20-2017, 03:40 AM
9. ### paired sample t-test vs. repeated measures ANOVA

I think that the Psychology Research forum is more appropriate so I moved my question there--I could not figure out how to delete this thread. Thank...

• Replies: 0
• Views: 2,530
10-17-2014, 08:03 PM
10. ### Error with Skillings-Mack test in R

I was trying to perform a Skillings-Mack test in R and can only get error message saying "Error in split.default(x = seq_len(nrow(x)), f = f, drop =...

• Replies: 0
• Views: 2,530
07-13-2015, 12:12 PM
11. ### Confused: correlated groups Chi Square?

Hi all, I have three groups: Group C is a subset of Group B which is in turn a subset of Group A. Members of Groups B and C were not randomly...

• Replies: 0
• Views: 2,529
09-27-2010, 06:12 PM
12. ### Relationship between time spans

1. purpose of the study/technique- I want to examine time stamped transcripts for 2 or more behaviors to see if they correlate. When variable 1...

• Replies: 1
• Views: 2,529
10-13-2011, 06:49 PM
13. ### abnormal data, log transform data, still abnormal, what to do?

Hello all, I have a dataset where I want to run repeated measures and I have abnormal data. So I log transformed the data set and it is still...

• Replies: 6
• Views: 2,527
06-20-2013, 02:19 PM
14. ### Longitudinal Statistics

I'm performing a longitudinal study on allergen challenged (daily) mice (3 total) where I sample blood from the same mouse daily, over a week's time,...

• Replies: 1
• Views: 2,526
09-08-2006, 08:32 PM
15. ### Manova

Hi, I need help with MANOVA analysis. I'm wondering which post hoc test you can use after MANOVA shows stat. difference in data. I have 4 groups...

• Replies: 0
• Views: 2,525
01-29-2011, 01:05 PM
16. ### too large p-value

Hi, I have a problem of interpretation of some results. The problem is the following: I have a model with 4 parameters I have N=55 data...

• Replies: 1
• Views: 2,524
12-01-2012, 07:57 AM
17. ### Analysis Likert Data and Comparing 2 Groups

I have 2 groups of people. There are 75 people in each group. Each group was given the same set of 7 Likert items. I want to compare the results...

• Replies: 7
• Views: 2,521
06-22-2013, 06:04 AM
18. ### Can you combine survey responses for a Confidence Interval

Hi, I'm doing basic analysis on a national survey but would like to combine responses to a question and was wondering if I can report a confidence...

• Replies: 2
• Views: 2,518
11-10-2010, 11:04 AM
19. ### What would be the appropriate statistical tool?

Dear all, I am a graduate researcher in the analysis phase of my research work. My research is an intervention research (n=14) trying to analyze the...

• Replies: 3
• Views: 2,518
01-11-2017, 06:17 AM
20. ### bootstrap and non-stationarity

Dear all, Is it true to say: If a time series X(t) does not satisfy the strict stationarity condition: P(X(t+1), X(t+2), ... , X(t+T)) =/=...

• Replies: 0
• Views: 2,517
11-03-2009, 02:06 PM
21. ### Outliers (Multiple outlier detection - PROC ROBUSTREG)

Can anybody describe to me (as simply as possible) what M-estimation and LTS estimation are? I'm trying to learn more about outlier detection...

• Replies: 0
• Views: 2,515
04-02-2012, 12:49 PM
22. ### Time: Ordinal and/or continous?

I am analyzing a storage study with time points, 34, 68, 102, and 200 days. I also have another variable to consider, which is nominal. I have...

• Replies: 2
• Views: 2,514
07-13-2011, 12:15 AM
23. ### Hello Everyone, need stats help

Hello everyone, :wave: I'm new to this forum. I need some help figuring out what kind of analysis to run for my undergraduate thesis. I did...

• Replies: 0
• Views: 2,513
04-09-2011, 04:48 PM
24. ### How can I statistically prove which data is more reliable

We have a task to statistically identify which data set is more reliable among the two sources. Case background: Design function releases drawings...

• Replies: 0
• Views: 2,511
11-26-2016, 12:56 AM
25. ### suitable statistical method

Hi all, This is my first post here. I have a data (Subset-A) requiring statistical treatment. Descriptive statistics of the data: Size =...

• Replies: 4
• Views: 2,510
10-08-2010, 04:39 AM
26. ### Need help analyzing data in SPSS

Hello everybody :) We conducted a simple experiment, our hypothesis was that negative biometeorological forecast induces nocebo effect, especially...

• Replies: 14
• Views: 2,507
04-26-2013, 08:59 PM
27. ### Insight from statisticians needed - identifying which parameters separate data.

Hi, I've got a dataset consisting of a few hundreds of dimensions. Each dimension has a value assigned to it at every time point. The data is...

• Replies: 0
• Views: 2,506
07-21-2013, 06:26 PM
28. ### comparison for 2 independent groups , t test or ANOVA

What test should i use for a comparison between two independent groups of N=30. Also if a questionnaire is made with only 2 answers like yes or no...

• Replies: 7
• Views: 2,504
06-15-2013, 07:47 AM
29. ### dealing with unequal sample sizes... can anyone help please?

Hello, I am comparing men and women on outcomes of their diagnostic assessment (autism). there are approx 600 men and 200 women. I have used...

• Replies: 7
• Views: 2,496
11-18-2014, 04:14 AM
30. ### Question on Log-Likelihood. Thanks in advance.

Question is: There are two lists of data, Y and X. Y is either 1 or 0, and X can be any number. And I have a logistic regression of Logit=B1*X, where...

• Replies: 2
• Views: 2,495
11-17-2008, 12:28 PM
31. ### Technical name - Is this a 'multi-level model'?

Hello. I am hoping that someone can tell me the technical name for the following type of analysis. I have a sense that it may be a 'multi-level'...

• Replies: 2
• Views: 2,493
07-28-2012, 01:15 AM
32. ### Which model to use for a meta-analysis? Fixed Vs Random effects model

I'm having trouble choosing which model to use to analyze my findings. My meta-analysis is about how effective a drug is compared to placebo or no...

• Replies: 0
• Views: 2,491
04-02-2014, 10:08 AM
33. ### Help with choice of nonparametric?

Hello, I have a very small sample, n=6 for an exploratory pilot study. I want to correlate the variables i have to see if there are any...

• Replies: 2
• Views: 2,490
11-07-2010, 02:57 AM
34. ### Nonparametric methods

If I have a sample with the size of the right and left arms of each of these people.So I have two dependent groups, since these are the same person,...

• Replies: 10
• Views: 2,490
12-16-2014, 06:30 AM
35. ### Determining a new variance

I am trying to understand a property of ML Estimates, that their distribution is asymptotically normal with covariance matrix inverse of Fisher's...

• Replies: 1
• Views: 2,485
BGM
02-19-2011, 04:30 PM
36. ### Comparing two groups on multiple DVs

Hi all! I'm hoping for some help with reviewer comments on a paper. I'm a grad student in behavioural neuroscience, with some stats courses under...

• Replies: 4
• Views: 2,485
09-25-2011, 05:08 PM
37. ### Stuck on Battle Plan for analysis

Hello, Currently I am looking for some advice regarding my research. Previous research has shown that Construct 1 and Construct 2 are both...

• Replies: 1
• Views: 2,485
11-21-2016, 03:10 AM
38. ### predictive analysis algorithm

Hi, What will be the best algorithms to use in case of predicting a large set of web data. mainly there will be 3 ,4 variables with which i want...

• Replies: 0
• Views: 2,484
05-25-2010, 07:57 AM
39. ### Sample

Consider we have a random sample (120 answers) and a convenience sample (80 answers) from the same population. Since the means of both samples are...

• Replies: 3
• Views: 2,484
05-31-2010, 08:03 AM
40. ### Multinomial Logistic Regressions in SPSS

Hello everybody! First of all, this is a repost, I don't know what happened with the original (maybe a mod deleted it without noticing me). ...

• Replies: 1
• Views: 2,482
12-25-2012, 11:25 AM
41. ### Stochastic digraph/motion model switching question

Am deleting this post due to a lack of response. Sad forum...

• Replies: 1
• Views: 2,480
Nav
03-12-2010, 06:15 AM
42. ### Need help to understand which statistical test to use on my data.

Hi all, i'm new here and it's a pleasure to join this forum. This is my first question here, i think it's easy to answer but i'm not absolutely...

• Replies: 2
• Views: 2,478
04-25-2013, 03:25 PM
43. ### Bayesian: Defining priors from *same* data set you're modeling

I believe that it is inappropriate to define prior distributions based on the same data you will be analyzing with those priors. In other words, the...

• Replies: 1
• Views: 2,476
09-22-2011, 07:47 PM
44. ### ROC Curves

Good Morning, I have a problem that may perhaps be very simple, but I keep getting very stuck and very frustrated. I'm trying to produce ROC...

• Replies: 0
• Views: 2,476
11-18-2016, 04:13 AM
45. ### which statistics to apply?

Purpose of my study is to understand better how the experimental lines I am using compare to the positive and negative controls under untreated or...

• Replies: 1
• Views: 2,475
10-06-2008, 09:15 AM
46. ### Help with interpreting simple chi-square!

Hi everyone, I ran a simple experiment on whether blame for failures in relationships was seen to be internal or external, and these were the...

• Replies: 2
• Views: 2,470
08-11-2012, 12:48 PM
47. ### Cox Proportional Hazard method survival analysis

Cox Proportional Hazard method survival analysis is the same as Cox regression analysis?

• Replies: 1
• Views: 2,470
03-20-2013, 02:22 PM
48. ### Model Suggestions?

Hello Stat experts - I'm hoping to find some inspiration in a project I'm doing. I have some longitudinal data, 15 series of measurements ...

• Replies: 2
• Views: 2,468
05-20-2010, 08:07 AM
49. ### Help: relationship between Regime type and war

Hy guys, i have a question and it's really important. I have to study the relationship between regime type and intrastate war. the dataset from...

• Replies: 0
• Views: 2,467
04-08-2009, 10:21 AM
50. ### Assumptions for mix design anova with covariates

Hello I Would like to nake a mix design (I HAVE TWO GROUPS -SICK AND HEALTHY), AND I made a cognitive measure of long / short exposure stimulus. ...

• Replies: 11
• Views: 2,464
01-01-2016, 01:36 PM
51. ### Survey on how frequently a group use a particular device: Which analysis methods?

I surveyed a group of photographers and asked them how frequently they used a particular type of lens for a specific type of photograph. I now want...

• Replies: 0
• Views: 2,464
11-08-2016, 06:51 AM
52. ### AR(1) Model: Are the results the same?

Suppose we have 23 observations, with time t=1,2,...,23. The dataset has 3 variable, t (time), x (independent) and y (dependent). The dependent ...

• Replies: 0
• Views: 2,461
07-27-2014, 01:32 PM

I asked for help few days back, but probably my question was not clear that time. I have asked e-gov experts to rank some issues related to e-gov...

• Replies: 7
• Views: 2,457
01-19-2011, 05:19 AM
54. ### Relationship between actual and expected

Hi, I am trying to illustrate relationship between expected and observed occurrences for my variable X. Outcomes for my variable vary between 0-5...

• Replies: 0
• Views: 2,457
10-24-2016, 06:46 AM
55. ### How can I best analyze this data

I have some data I am trying to analyze but was hoping to get some stats help with it. I'm not sure what the best way to analyze it is. I'm...

• Replies: 4
• Views: 2,452
04-13-2016, 04:04 PM
56. ### cronbach alpha for missing data

Hi, I have an indicator which consists of questions 24, 25, 27, 29, 30, 31, and 32. I am in the middle of determining internal consistency and...

• Replies: 0
• Views: 2,451
10-07-2014, 06:25 PM
57. ### variables in linear mixed model

Hello, I'm performing a longitudinal study, that compares computer use duration measured by 2 different methods: by questionnaire and computer...

• Replies: 0
• Views: 2,450
02-11-2009, 10:27 AM

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