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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: 18,755
10-11-2014, 12:02 PM
1. ### 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: 3,401
02-04-2013, 04:44 PM
2. ### Mann Whitney

Hi guys, Do you know if it's normal to get a U= 0.000 (z= -2.32, exact Sig = 0.029 with 4 subjects in each group)? Thanks

• Replies: 0
• Views: 2,002
09-20-2013, 07:45 AM
3. ### website splits - sample sizes

Id like to do some research into website splits. As visitors arrive to one of our websites (lets call it id=123), the page will randomly deliever...

• Replies: 0
• Views: 2,107
11-19-2008, 08:47 PM
4. ### Bayesian Me

We had a (prior) hypothesis that these two binary groups were 30% different. So two categorical variables that are binary. We have the data and they...

• Replies: 0
• Views: 1,263
06-19-2015, 03:54 PM
5. ### Wilcoxon sign rank test and sample size

In the Wilcoxon signed rank test, it uses the binomial distribution to calculate p-value for n<20. What would it use if greater/equal to 20?

• Replies: 2
• Views: 2,117
03-07-2016, 04:21 PM
6. ### Non-Inferiority Test in Multple Logistic Model

Does any body have any insight or experience running a non-inferiority test based on multiple linear or logistic regression. So perhaps mean and risk...

• Replies: 1
• Views: 1,214
03-28-2016, 01:22 PM
7. ### Influence of a person in repeat measurement (multilevel) or longitudinal data

Hey, I have a dataset of 50 people with 4 responses over the year. Responses were a 5-point Likert scale collapsed into a binary variable (0,1)....

• Replies: 3
• Views: 1,100
07-08-2016, 11:23 AM
8. ### 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: 2,630
11-14-2016, 03:21 AM
9. ### Repeated k-fold Cross-Validation

I saw this: "Any advices on practice? It depends on the data, but it's common to find examples cases 10 fold CV, plus repetition: 10 fold CV,...

• Replies: 12
• Views: 7,172
12-16-2016, 10:35 AM
10. ### Sample Size Calc for Right Skewed Data

I have a request from a person for a sample size calculation. When I requested information about the potential study data they provided two means and...

• Replies: 14
• Views: 1,572
06-14-2017, 11:30 AM
11. ### How to model time intervals

I have a dataset that I am trying to analyze that contains price information for a market index. I suspect that the behavior of the price for this...

• Replies: 0
• Views: 1,476
02-20-2012, 10:07 AM
12. ### which test?

Hi i have some data and i want to analysis them. i have 64 mouses at 8 group, i took 2 drugs to them with different tubes and doses. so i want...

• Replies: 1
• Views: 1,376
07-13-2013, 06:49 AM
13. ### Need help on the suitable design selection

hi guys... i have been given a set of data with 5 input factors and 1 output. among the inputs, 3 are in numerical form and another 2 are in...

• Replies: 0
• Views: 2,421
03-11-2012, 10:48 AM
14. ### breaking data into training and testing (hold-out) sets

Dear Stats Forum, I am a grad student with an introductory stats background. For my research, I'm conducting an experiment to compare the predictive...

• Replies: 3
• Views: 2,737
07-21-2012, 04:47 PM
15. ### 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: 1,296
02-24-2014, 01:37 PM
16. ### correcting for early user bias

Okay, forgive me if this is in the wrong place. Feel free to move it if it isn't. And please forgive me as I know VERY little about statistics and my...

• Replies: 7
• Views: 2,276
07-20-2015, 08:24 PM
17. ### Correct terminology? Expected FPR vs Observed FPR

Hi. My first post here, great forum! I have a "terminology problem". I'm devising a statistical test, and it works fine but has a flaw; it is...

• Replies: 0
• Views: 2,106
10-10-2011, 03:09 AM
18. ### 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: 1,454
12-23-2015, 12:49 PM
19. ### What is the purpose of multigroup invariance test?

Hi, I am confused about the purpose of multigroup test. According to Byrne (2008), many studies focus on multigroup comparisons, and assume two...

• Replies: 2
• Views: 1,951
03-10-2013, 08:52 PM
20. ### Help Me ........

I am looking for a topic for my Mphil research. I am fed up with searching for a topic. i am interested in computational statistics, multivariate...

• Replies: 6
• Views: 2,008
10-27-2011, 03:57 PM
21. ### Cumulative Periodogram

Hello, As part of my master's research, I am exploring a cyclic pattern in daily climate data (latent heat flux). To explore this pattern, I...

• Replies: 1
• Views: 5,205
10-20-2013, 11:17 PM
22. ### Joint Normal CDF

Hello I am new to this forum as well as to actuary field. I have this question: There are two random variables X_1 and X_2 following standard...

• Replies: 7
• Views: 7,549
06-20-2008, 08:13 AM
23. ### Methods help: How to find significant differences between groups with ordinal data?

In examining how students performed at the detail level of an assignment, I have received data that is essentially in the form of a checklist....

• Replies: 3
• Views: 2,650
10-26-2012, 11:32 AM
24. ### Analysis with multiple unordered factors?

Hi everyone, I hope some expert out there can point me in the right direction on this. I have a binomial outcome (A/B) and a number of...

• Replies: 0
• Views: 2,071
hrj
09-18-2010, 03:50 PM
25. ### Consistency in statistical tests

Hiya, this is quite a basic question. I'm testing whether administration of a drug causes an increase in 7 different dependent variables. So my...

• Replies: 1
• Views: 4,065
06-22-2012, 02:47 PM
26. ### Appropriate form of ANOVA when blocking

Hi, I'm new to this forum (and relatively new to statistics) and have a question :) I have a text book that outlines the following experiment: ...

• Replies: 3
• Views: 1,648
06-21-2012, 03:51 AM
27. ### Multiple comparison tests with no ANOVA

Hiya, I've tried to find an answer to my question by searching the net but I can't find any clear solution. I want to compare the effect of...

• Replies: 0
• Views: 1,512
06-26-2012, 11:56 AM
28. ### MANOVA: IV with only two levels

Hi, I'm a biological science university student with an interest in teaching myself some basic inferential statistic and have been learning about...

• Replies: 2
• Views: 1,638
03-14-2013, 06:48 AM
29. ### Repeated measures where different cells from the same subject are used?

Hi, I work in a lab where we routinely use people's cells in studies, comparing the effect of different treatments on those cells. We use the cells...

• Replies: 0
• Views: 727
02-24-2014, 10:47 AM
30. ### Help needed urgently - dichotomous question

Hi everyone, I have the following answers to the survey question "are you a new client" (Yes/No). My sample is 1200 clients with 520 respondents....

• Replies: 5
• Views: 3,194
07-28-2011, 07:54 AM
31. ### How do you account for under representation in your survey sample

Overall, i have 10 groups in my sample. 2 groups are under represented. What is the best way to account for this under representation. Would...

• Replies: 1
• Views: 2,226
08-08-2011, 03:18 AM
32. ### Op notation

Hey Guys. It is my first time here. Glad to meet you all. I've got a question on Op notation. In my research, I've got an assumption associated...

• Replies: 2
• Views: 2,900
12-04-2010, 05:18 PM
33. ### How do we do statistics on repeated phenomenon?

Hi everyone, I've got a question on statistics on repeated phenomenons. For example, If I have a time series data which I used exploratory data...

• Replies: 0
• Views: 3,369
12-04-2010, 05:28 PM
34. ### How to estimate two series covariance with unlined observed data?

Sorry if I use the wrong terminology. My problem is, suppose I have two time series, they change every day. However, I can only observe them...

• Replies: 1
• Views: 1,912
08-17-2011, 10:22 PM
35. ### multinomial distribution and degrees of freedom

Hi I have some data from a housing survey (sample size 13,500) and have found that the proportion of privately rented housing is slightly higher...

• Replies: 2
• Views: 1,020
03-26-2014, 05:17 AM
36. ### (Using R) What’s the right test to compare for significance?

First of all, many thanks for looking at this post. My problem is partly technical knowledge (or lack of), but mainly one of perception! I’ve been...

• Replies: 0
• Views: 13,695
05-24-2013, 05:47 AM
37. ### how to calculate SD or SEM of ratios?

I have 2 groups of data. Group1: x1,x2,x3,x4. Group2:y1,y2,y3,y4. I want to get the ratio of y over x (Y/X) and also needs to know the SD or SEM of...

• Replies: 3
• Views: 2,951
07-10-2014, 08:34 AM

My manager wants me to do a research about advance purchase day vs. fare. however it involves too many categories, and we have billions of tickets...

• Replies: 0
• Views: 2,231
11-19-2009, 12:05 AM
39. ### Comparing means from SAME sample

I've done an experiment with human participants, n=40, so it's a large sample n>=30 from a large population. Now I'm trying to understand the...

• Replies: 0
• Views: 3,671
09-01-2010, 01:35 PM
40. ### Do I need separate margins of error?

I have a question regarding margins of error. I'm looking for correlations between political knowledge and favorability of presidential candidates...

• Replies: 0
• Views: 1,631
10-13-2011, 11:01 AM
41. ### Quantifi the homogeneity

Hello i am hydrologe and i search to find a solution for the following problem: Suppose that i have k samples of observations (region) of the...

• Replies: 2
• Views: 1,420
05-30-2013, 09:33 AM
42. ### test for compariing pre- post test on same anonymized participants

I am conducting a research to study the change in business skills, and attitude towards self employment after a compulsory intervention program for...

• Replies: 0
• Views: 2,132
10-03-2016, 07:20 PM
43. ### Hypothesis testing for comparing single channels of states in multivariate HMM

In brief: I have a multivariate observational output with low covariances, each dimension of which can be considered the result of a distinct hidden...

• Replies: 1
• Views: 2,496
02-23-2011, 03:34 AM
44. ### The appropriate form of analysis / technique and terms?

My assignment is to do the give the appropriate form of analysis / technique or term for a list of scenarios. I am lost on a few and would...

• Replies: 1
• Views: 1,783
12-08-2014, 01:45 PM
45. ### Scale Issue - MANOVA vs Kruskall Wallis

Hello, In my dissertation, I asked people in the general population to complete a battery of team process measures based on an effective team...

• Replies: 2
• Views: 2,090
01-28-2015, 03:50 PM
46. ### Compute an optimization stress from size distribution density and abundance

Hi everyone, Here's the shortest version of this optimization problem: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -...

• Replies: 0
• Views: 1,288
06-23-2014, 04:56 AM
47. ### MS Thesis Topic Recommendations from Journals concentrating on Parametric Tests

I would like to know if you can recommend sites where journals, particularly statistical researches, can be viewed completely. Alternatively, can you...

• Replies: 0
• Views: 1,272
05-17-2014, 10:24 PM
48. ### is validation really required

I have time series data of about 150 sample and 8 variables. It is used to generate a interaction network, whose exact structure is not known yet. ...

• Replies: 0
• Views: 1,603
ice
09-29-2014, 02:39 PM
49. ### Autocorrelation of panel data: need literature!

I have (so-called) dynamical monte carlo model of a number of identical chains within simulation box And i've measured some data (like radius of...

• Replies: 2
• Views: 1,858
08-24-2012, 11:38 AM
50. ### Normal Extreme Values

Mostly I have been answering questions, but today I am asking one: what is the distribution of the maximum of n draws from a normal distribution? ...

• Replies: 2
• Views: 2,849
10-17-2010, 11:19 PM
51. ### Kolmogorov-Smirnov to Lattice Path mapping

I often see the claim that the null distribution of Kolmogorov's D+ statistic maps onto a lattice path problem that requires computing the number of...

• Replies: 0
• Views: 2,406
02-17-2011, 05:11 PM
52. ### Appropriate method for research model

Hi guys! Please i need your advice! I have developed a model about some factors that influence the desire of members to share information is...

• Replies: 16
• Views: 6,166
07-26-2011, 10:11 PM
53. ### Bayesian analysis of logistic dependent variable, with between and within subjects in

I have a dataset consisting of two groups of participants (25 participants in one group and 26 in the other), with each participating in two...

• Replies: 0
• Views: 719
09-01-2016, 02:19 AM
54. ### Comparing the output of JAGS to conjugate analysis - normal with unknown mean and var

Dear Bayesians. I'm starting my way in the Bayesian world, and I'm trying to build a simple model for estimating the mean and variance of a normal...

• Replies: 0
• Views: 1,059
09-20-2016, 09:02 AM
55. ### What tests should I use to analyze my data? Immediate input appreciated

Hello TalkStats members :wave: I have some data I need to analyze. I first would like to say I hope I am posting this in the correct sub-forum,...

• Replies: 2
• Views: 4,275
04-10-2011, 07:13 PM
56. ### How to compare the convergence over time between two groups?

Hello, My goal is to check if the convergence of the Interquartile Range (IQR) over time is significantly different between two groups. I have...

• Replies: 0
• Views: 1,367
ido
07-31-2013, 03:10 AM
57. ### Unable to determine the right test?

hello, I'm doing a paper on measuring authors productivity and unable to decide what should I use as my statistical test to come up with solid...

• Replies: 8
• Views: 2,396
10-20-2013, 01:09 PM
58. ### Urgent Help Needed!!!

Hi. I am getting really confused... Conducted a research with 6 people. they had 2 different conditions (medicine and placebo), and they were all...

• Replies: 1
• Views: 1,909
10-31-2011, 11:50 AM
59. ### Promo analysis

Hi everyone, Can you please give a hint on what method I should use to find price anomalies on one market if I have POS data for the entire...

• Replies: 0
• Views: 2,032
09-30-2013, 05:39 AM

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