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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: 19,447
10-11-2014, 12:02 PM
1. ### How to calculate standard error for win rates of sampled data

Hi Forum, I'm working on a problem regarding win rates and can't find a good solution for calculation of standard error of my results. I have...

• Replies: 0
• Views: 1,385
08-23-2014, 09:23 AM
2. ### Principal Components Analysis

Hello everybody, I have 15 time series consisting of returns on classic asset class investment (Stocks, Bonds, etc.) and some more advanced...

• Replies: 0
• Views: 1,100
08-22-2014, 08:45 AM
3. ### Repeated measures design question

Hi all, It's been a while since I've been involved with statistics and was hoping to be pointed in the right direction. I have a data set...

• Replies: 0
• Views: 1,324
08-19-2014, 01:59 PM
4. ### True slope coefficient - help needed

To be deleted !

• Replies: 0
• Views: 1,992
08-18-2014, 02:44 PM
5. ### Paired Vs unpaired t-test - which one to use?

Good morning, I am a little stuck - I understand the difference between the two tests and am happy with written examples in a stats book I found....

• Replies: 1
• Views: 3,018
08-18-2014, 07:12 AM
6. ### What kind of ANOVA is good for this

Hello, In my research i've collected death % for cell cultures. One variable was the treatment used (0,2,4,10,16 exposure). Another one was the...

• Replies: 3
• Views: 2,801
08-17-2014, 01:53 PM
7. ### Need Help wih My College Assignment

I need some help with my college assignment but I cannot find some reliable source. I want to get some help from cheap assignment writing service. Is...

• Replies: 0
• Views: 1,474
08-17-2014, 09:50 AM
8. ### correlation with missing data

I got a problem with correlating 2 signals x1,x2 (isgnal in time) with missing data. the missing data is periodic and is in both signals. my...

• Replies: 0
• Views: 1,516
08-17-2014, 05:46 AM
9. ### Correct methodology when not sure of linearity for continuous response variable

I already posted on this, but haven't gotten an answer to my core question - which is, what type of statistical analysis should I run. I have...

• Replies: 1
• Views: 1,306
08-17-2014, 04:21 AM
10. ### Stores and ordered rank of products

I have data about popularity of some products in some stores. For each of the stores I have only a ordered rank of best-selling products in them. I...

• Replies: 3
• Views: 1,403
08-16-2014, 08:34 PM
11. ### ANOVA and Tukey comparisions

Hi! I'm using Minitab to run ANOVAs for a recent psycholinguistic experiment. My problem is that some interactions aren't even close to significant...

• Replies: 0
• Views: 1,167
08-16-2014, 05:21 PM
12. ### Continuous response variable and categorical predictor - what type of analysis to use

Hi, I am dealing with data in which the IV's are not easily partitioned - participants can belong to one, two+, or none of the categories for a given...

• Replies: 4
• Views: 1,366
08-16-2014, 03:44 PM
13. ### Significance aside - correlation coefficient

Hi everyone: It's been a while since I have posted here and I hope that I am posting in the right forum. In my field, sometimes people like to...

• Replies: 6
• Views: 1,758
08-15-2014, 08:48 AM
14. ### Question about splitting data

I am wondering what the most common way to handle data is wherein a participant belongs to multiple groups. For example, if you're wanting to run...

• Replies: 0
• Views: 1,271
08-14-2014, 09:25 PM
15. ### 4 simultaneous non-independent measures – should nested ANOVA work?

Hi all, this is my first time posting here, but I’m very stuck. I have to analyze data from an animal behavior experiment. I have 3 strains, with 20...

• Replies: 0
• Views: 2,782
08-14-2014, 02:35 PM
16. ### Difference in mean for compositional data

How do you test for a different mean between groups in composititions?

• Replies: 0
• Views: 1,158
08-14-2014, 02:11 PM

Hi everyone! I'm new here, and wanted some advice on a methodology I'm using for a study of mine. Due to some confidentiality requirements, I can't...

• Replies: 2
• Views: 1,491
08-14-2014, 07:49 AM
18. ### Kolmogorov-Smirnov

Hi, I have used a two sample kolmogorov-smirnov test to compare the distributions of two sets of data. I know that the K-S test is a non...

• Replies: 2
• Views: 1,393
08-14-2014, 07:27 AM
19. ### Correct Use of Chi-Square?

Hi all, I am trying to test whether one group is significantly different from another in two different collections of data. I have seen that...

• Replies: 0
• Views: 1,667
08-14-2014, 02:34 AM
20. ### Standardizing non-normally distributed data?

Hi everyone, I'm working on a project at the moment that aims to compare subjects based on different characteristics. At the moment, I am looking...

• Replies: 3
• Views: 3,623
08-13-2014, 10:57 AM
21. ### Conditional distribution for covariance matrix with constraint

Hi, I'm trying to work out how to draw from the conditional distribution for a covariance matrix given some correlated multivariate Gaussian data....

• Replies: 2
• Views: 1,705
08-12-2014, 11:16 AM
22. ### Best Method to Calculate P-Values for These Data?

Hello. I am a first year chemistry Ph.D. student with very little statistics experience. I am working with biophysical data, performing statistical...

• Replies: 2
• Views: 1,737
08-10-2014, 11:17 AM
23. ### (Reasonable) way to simulate outliers?

hi! so i've been wanting to tackle a project related to Spearman's rho through simulation and i think it would be reasonable to include an...

• Replies: 1
• Views: 1,430
08-08-2014, 02:55 PM
24. ### Random Sampling in Mixed Models

Hi, I have a data set that contains 40 firms over 15 years with firm and individual level data, with the individuals being sample randomly from...

• Replies: 0
• Views: 909
08-06-2014, 05:48 PM
25. ### Surival analysis STATA - splitting up the time analysis interval/sum stats

I am analyzing a data set - analysis of newspaper failure- over a 55 year time span and also looking at a time span of the last ten years. My goal...

• Replies: 0
• Views: 1,680
08-06-2014, 02:05 PM
26. ### How many tests?

Hi, I am trying to bridge a new reagent with an existing one so when the existing one runs out I can use the new one. I want to test the old and...

• Replies: 1
• Views: 1,183
08-06-2014, 09:10 AM
27. ### Querry

Hi der, I am a beginner for SPSS, I wanted to do correlation, regression and multiple regression between set of variables. My difficulty in...

• Replies: 0
• Views: 1,119
08-06-2014, 02:12 AM
28. ### Correlation coefficient for zero inflated count data

Hi, I would like to ask what is the proper correlation coefficient to use for count data and for zero inflated count data. would Kendall tau do...

• Replies: 0
• Views: 2,101
08-05-2014, 08:22 AM
29. ### ANOVA with repeated measurement: multivariate tests; MANOVA for repeated measures

Hello everyone I need help with my analysis of variance with repeated measurement. I did a study where I measured 6 values of every participant...

• Replies: 0
• Views: 1,231
08-05-2014, 07:32 AM
30. ### Running regression for each cluster

Is this common or reasonable? Run a k-means cluster analysis and then do a separate logistic regression for each cluster? For simplicity, let's...

• Replies: 1
• Views: 1,363
08-05-2014, 12:47 AM
31. ### comparing simulated and experimental data

Hi All, I generated a time series data by simulation (each condition has been generated time condition1 condition2 condition3 .... ...

• Replies: 0
• Views: 1,344
08-04-2014, 03:08 PM
32. ### reference for representation of linear functionals of random variables

I'm looking for a representation theorem for linear functionals of random variables. I'm not sure if Riesz–Markov–Kakutani does it, but it seems...

• Replies: 2
• Views: 1,453
08-04-2014, 12:27 PM
33. ### Which Tests?

Hello! I am considering a study I'll note below, but have limited statistical experience. Accordingly I am seeking insights on which tests are...

• Replies: 2
• Views: 3,209
08-03-2014, 10:56 PM
34. ### SEM Confidence Intervals and Repeated Measures

I'm analysing data from a repeated measures study. All of my stats tests (ANOVA and non-parametric tests where appropriate) are telling me that the...

• Replies: 3
• Views: 1,901
08-03-2014, 06:43 PM
35. ### Interpreting Kruskal-Wallis results

Hi all, I've just finished my undergrad thesis and the reviewers strongly recommended that I pursue formal publication of my results. I thought...

• Replies: 10
• Views: 4,866
08-03-2014, 04:53 PM
36. ### GLMM - fitting random effects to a complex field design

Dear forum users, I’d be very grateful to hear about any opinions on a problem I’m having with the random effects side of my generalised linear...

• Replies: 6
• Views: 2,210
08-03-2014, 05:07 AM
37. ### Which method to use? ANOVA, one way regression, or else?

Hi guys, For my research I have an independent variable 'education', which varies from 1 (low) to 6 (high) and a dependent dummy variable which is...

• Replies: 7
• Views: 1,914
08-03-2014, 02:52 AM
38. ### SD diff

Greetings. Kinda new in stats. Wanna know how do we calculate sd diff between two means. E.g. mean 1 = 319.2 sd 1=71.5 while mean 2 = 360.8...

• Replies: 1
• Views: 2,088
08-02-2014, 03:39 AM
39. ### Comparing categorical data for a relationship - alternatives to a chi-square test?

Hi Everyone, This is my first post here, and I am very new to statistical testing, so I'm going to try to make this question as clear as possible...

• Replies: 0
• Views: 1,025
07-31-2014, 12:42 PM
40. ### Testing of a normality (Shapiro-Wilk test)

Hello, please I need advise on the testing of a normality. I have 5 types of objects in one diagram - grid, function, matrice, table and scalar for...

• Replies: 0
• Views: 1,182
07-31-2014, 06:08 AM
41. ### Can I impute an independent variable with a dependent varible?

I'm building a regression model Y = X1 + X2 + ... + Xn There're about 10% subjects who have missing value on two of the predictors. If I use...

• Replies: 0
• Views: 1,380
07-30-2014, 06:18 PM
42. ### Meta-analysis: different information about relationships between two variables

Hello everyone I need help with my meta-analysis. I have collected all the studies that I wish to include and would like to take Pearson's...

• Replies: 7
• Views: 978
07-30-2014, 08:37 AM
43. ### Manova with within-subject and between-subject factors (no repeated measures!)

hello, i need to do a manova with one within-subject factor (veracity) and two between-subject factors (type of speaker and type of presentation)....

• Replies: 0
• Views: 1,380
07-30-2014, 05:19 AM
44. ### 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: 1,233
07-29-2014, 09:02 AM
45. ### Repeated Measures ANOVA and baseline control

I’ve been asked to work on a cross-over design study for an MSc project. The study is looking at the effects of sleep deprivation on word recall....

• Replies: 4
• Views: 2,316
07-29-2014, 07:15 AM
46. ### MANOVA versus t-tests : unconsistent results

Hi, here is my problem. I am trying to compare the change on a language measure from time 1 to time 2 between 2 groups. If i do a repeated...

• Replies: 3
• Views: 2,074
07-29-2014, 12:48 AM
47. ### Having a hard time deciding on what test to use for data

Here is the premise: There are large events taking place on park land. We are using noise disturbance hardware to measure decibels during and not...

• Replies: 6
• Views: 1,977
07-28-2014, 02:05 PM
48. ### 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: 3,622
07-27-2014, 01:32 PM
49. ### measure of association

I want to explain more my problematic. I have a robot and i am clapping in order that the robot goes forward, back, left and right. The problem is...

• Replies: 0
• Views: 871
07-27-2014, 02:05 AM
50. ### What are some data mining techniques for analyzing cause of disease

I have a dataset of 300 observations, of which 200 are normal, and the rest have the disease. I have the cognitive assessment scores of these 300...

• Replies: 1
• Views: 1,312
07-27-2014, 12:31 AM
51. ### Comparing time curves for two groups in research.

Hello, I am creating time curves (experimentally) for two groups of mice (f(t) and y(t)): number of particular cells (in murine blood, per ml of...

• Replies: 3
• Views: 1,911
07-25-2014, 11:45 AM
52. ### Post-hoc power analysis

I have analyzed data by performing a regression model in three steps - (a) two psychological independent variables, (b) adding a political...

• Replies: 2
• Views: 2,830
07-24-2014, 11:03 AM
53. ### Top AIC model with no significant parameter estimates

Hello, I am working on a project in which my top model has normal looking standard errors, but all of the parameter estimates overlap zero,...

• Replies: 6
• Views: 1,908
07-24-2014, 08:23 AM
54. ### 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: 1,945
07-23-2014, 10:54 PM
55. ### sample size calculation with ratings/instances nested within each subject

Hi, As a brief background, each subject is rating all his/her activities within the day (called instances). I want to calculate the sample size...

• Replies: 0
• Views: 900
07-21-2014, 02:00 AM

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