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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: 19,403
10-11-2014, 12:02 PM
1. ### Factorial experiment in CRD with unequal replications

Hi guys, i am a graduate student in statistics. i want to test for the main and interaction effect of 3 treatments on a group of patients. let say...

• Replies: 3
• Views: 1,653
03-18-2016, 06:59 AM
2. ### Problem with the reliability analysis and factor analysis.

Hi, As I am working on the statistical research for my graduation, I encountered two problems; 1) I am measuring two multi-dimensional...

• Replies: 0
• Views: 1,087
03-17-2016, 08:45 AM
3. ### Anova or t-test on squared errors

I have two forecasting models, moving average and single exponential smoothing. The values of Mean Absolute Percentage Error (MAPE) is 5.2%, 5.8%....

• Replies: 0
• Views: 1,489
03-16-2016, 05:13 AM
4. ### Reliability in observational research

Hi, everybody I am currently writing my master's degree. In relation to this I have come across a problem regarding reliability in two of my...

• Replies: 0
• Views: 1,910
03-15-2016, 02:24 PM
5. ### 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: 2,017
03-15-2016, 06:44 AM
6. ### Nonparametric for paired, but unequal sample size

Hi, I'm in the midst of writing my master thesis, but I'm having issues with the statistics. I've measured muscle cells. In short, I've 4...

• Replies: 4
• Views: 1,414
03-14-2016, 10:29 AM
7. ### Probability distribution function

Can somebody explain what is probability distribution function and probability density function in layman terms?? Thanks

• Replies: 0
• Views: 1,583
03-12-2016, 03:51 PM
8. ### estimate a range of measures

Hello everyone, I am a statistics student, I'm studying for a project in my University. I have to analyze the data, I have available the measures in...

• Replies: 0
• Views: 1,081
03-12-2016, 05:41 AM
9. ### Kendall's tau-c testing significance

Hi! I'm very new with statistical research and I need a simple explanation how to test is my correlation what I have with my Kendall's tau-c test...

• Replies: 0
• Views: 1,639
03-11-2016, 01:39 PM
10. ### Power and sample size calculation for neuroscience

Dear TalkStats, I have searched the forum but cannot find the answer I am looking for, if you could help that would be great! I am recording...

• Replies: 0
• Views: 1,689
03-09-2016, 04:45 AM
11. ### 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: 2,232
03-07-2016, 04:21 PM
12. ### Confidence intervals and effect size for non-parametric tests help

Hi I am currently carrying out data analysis on SPSS for pre post treatment measures using non-parametric tests, the Wilcoxon signed rank test...

• Replies: 1
• Views: 1,506
03-05-2016, 10:13 PM
13. ### test of normality help

Dear Friends i need help in statistical research paper kindly assist some help thank you.

• Replies: 4
• Views: 1,484
03-03-2016, 08:02 PM
14. ### False Coverage Rate - adjusting confidence intervals for multiple comparisons

Hello, I could do with some help regarding correcting confidence intervals for multiple comparisons. I have carried out a number of multiple...

• Replies: 2
• Views: 1,296
03-03-2016, 09:09 AM
15. ### Interpretation of an AR model

hi, looking at process times of a rather complex machine I found that an AR(2) model describes it quite well. Does it make sense to interpret this...

• Replies: 2
• Views: 1,086
03-02-2016, 11:50 AM
16. ### Which test to use for these variables and their associations

Hey, I have some questions about which test I can or have to use. Which test do I use to only identify if there is a relationship between those...

• Replies: 0
• Views: 851
03-01-2016, 08:29 AM
17. ### 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: 2,760
02-29-2016, 06:07 AM
18. ### Data Analysis visualization

Hi Everyone, Lately I have been searching a data analyzer tool/software, which would also present my data in a better way. I came across DataPlay...

• Replies: 0
• Views: 1,104
02-26-2016, 03:07 AM
19. ### [SOLVED] Option for post-hoc test after permanova for community data?

Hi there, Thank you for reading my post and hopefully someone can provide me with some help! For my master's thesis, I have used microbial...

• Replies: 3
• Views: 4,260
02-24-2016, 08:58 PM
20. ### Rasch Analysis

Hello all, someone asked me to look into Rasch Analysis. I have found a few articles that I am going to read but I was just curious if anybody is...

• Replies: 4
• Views: 3,762
02-23-2016, 12:09 PM
21. ### Which Statistical test to use?

Can someone tell me the statistical tests I could use with the following variables. Independent variable categorical (high, medium, low)...

• Replies: 1
• Views: 1,326
02-23-2016, 02:54 AM
22. ### Reliability and Validity

Hi every body am conducting an educational research, and I've been asked to use statistics in my research!! I used a test in a pre and post...

• Replies: 3
• Views: 2,047
02-21-2016, 01:42 PM
23. ### Significance test for 13 dichotomous DVs?

I am studying unprofessional conduct. I have every case of misconduct over a 5-year period. I am curious if misconduct varies by education level. ...

• Replies: 0
• Views: 1,342
02-18-2016, 12:34 PM
24. ### Definition of deflated

Hello guys Do you know what do they mean by "deflated" in the following sentence? "firms reported goodwill impairment loss ( expressed as...

• Replies: 3
• Views: 2,185
02-13-2016, 08:13 PM
25. ### question about change in period

Hello guys:) I wonder whether you can help me. I do not know which analysis i can use. My aim is to prove or not the following hypothesis: ...

• Replies: 0
• Views: 903
02-12-2016, 07:10 PM
26. ### Structural Model & Fit Indices

I am new to the statistical area. I have a test that uses a Structural Model that is used to test the causal hypothesis between independent variables...

• Replies: 0
• Views: 1,009
02-11-2016, 12:56 AM
27. ### SPSS-Uneven Sample Size and choice of analysis for two fixed factors with 4 variables

Hi All, I have a dilemma that I have been trying to find the answers myself but cant seem to find anything to solve my problem. I have...

• Replies: 0
• Views: 1,078
02-10-2016, 02:19 AM
28. ### Confused: Metropolis-Hastings, its variations and the Hastings correction ratio

Hello everyone, Over the past few weeks I have been studying MCMC and Metropolis-Hastings algorithms. Unfortunately I am stuck and confused with...

• Replies: 2
• Views: 3,540
02-08-2016, 11:05 PM
29. ### Stats for emergency care delivery

Hi all- I am hoping you can help me. I'm trying to write a paper on a new model in my ED, which reduced wait times/LOS, and improved other things...

• Replies: 2
• Views: 1,211
02-06-2016, 02:36 PM
30. ### Question concerning an "unusual" research design

Hey everyone, I have a question concerning a between group research-design and I wonder if it is very wise since I never came across a similar...

• Replies: 0
• Views: 1,286
02-04-2016, 03:11 PM
31. ### Splitting obs. based on DV class for separate random forest runs

I am working with a relatively large (n=162,000) data set on a land use classification problem using random forest. I have four land use classes...

• Replies: 1
• Views: 1,659
02-03-2016, 04:12 PM
32. ### Leave-one-out cross validation

Hi, I am trying to understand the Leave-one-out cross validation method but all sources explain it mathematically. Can someone please basically...

• Replies: 4
• Views: 894
02-01-2016, 09:05 PM
33. ### Hypothesis testing

There is no statistically signifincant difference ........how to interpret this!

• Replies: 1
• Views: 1,341
02-01-2016, 09:53 AM
34. ### Recognition of multiple spacial patterns

Hello! I am looking for some nifty techniques or methods to help me gather elements of a set which are compatible with a base pattern. The set...

• Replies: 0
• Views: 1,088
01-31-2016, 07:42 AM
35. ### How to calculate sample size and effect size for comparing means from two groups

Hi all, hoping i can find some answers here for a bit of a problem i am having regarding a sample size calculation for a study I am soon to conduct. ...

• Replies: 3
• Views: 1,573
01-31-2016, 03:09 AM
36. ### Question about type of research

Hello guys!:) I wonder whether anyone of you who is killing in statistics could give an advice. I am writing my master thesis at the moment. The...

• Replies: 0
• Views: 1,198
01-30-2016, 11:30 AM
37. ### General inverse variance method

Hi I hope I've posted this in the right place. I'm converting standardised mean differences to log OR for a meta-analysis. Just wanting to know...

• Replies: 1
• Views: 1,376
01-25-2016, 08:55 AM
38. ### How do i analyze the following results statistically?

In an animal experiment study, efficacy/preference of an energy drink was compared against the individual compounds present in it. 3 groups were...

• Replies: 0
• Views: 1,025
01-24-2016, 10:34 PM
39. ### How should I run an interaction test to find out the main effect of ad type?

Hello everyone, I designed an experiment. There are two types of advertisement, type 1 and type 2. 50% of my participants looked at the type 1 and...

• Replies: 1
• Views: 1,196
01-21-2016, 04:36 AM
40. ### Fisher's Exact test and subjects with multiple observations?

Hi Everyone, I was wondering if I could please have some advice on how to deal with data that have multiple observations for some of the subjects...

• Replies: 4
• Views: 1,453
01-20-2016, 06:31 PM
41. ### Is it meaningful to calculate a p-value based on a convenience sample?

Ignore the bootstrap as a possibility. If the answer is no, then what is the point of stating the p-value (especially if it is, say, 0.10)?

• Replies: 20
• Views: 5,598
01-16-2016, 05:47 PM
42. ### 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: 1,475
01-16-2016, 02:47 PM
43. ### Using standard deviation on two mean values of two different instruments

Hi all, I'm making a research and doing a final data analysis. The research was undertaken using a questionnaire and then structured interviews....

• Replies: 0
• Views: 655
01-14-2016, 01:49 PM
44. ### What tests should I use when my moderator is discrete?

Hello everybody, I am currently in the final phase of my master thesis. I have collected my data and I am trying to do my statistical tests, but I...

• Replies: 0
• Views: 1,072
01-14-2016, 10:38 AM
45. ### Multi Modal Example trying to assess correct Statiscal approach

I am trying to figure out the best statistical approach to address a problem. I am looking at 100 retail stores and looking at their hourly traffic....

• Replies: 1
• Views: 1,249
01-12-2016, 01:52 PM
46. ### Should I use Bonferroni (or other similar corrections)?

Hello! I am new in this forum, I have a question and I hope you could help me! :p Suppose that I have to measure 10 independent variables on 60...

• Replies: 0
• Views: 1,145
01-08-2016, 03:57 AM
47. ### Statistical Design of Experiments: Impact of missing and/or changing experiments

Hello, I am new to both this forum and the concept of statistical design so please, treat me like the novice I am! OK, so I am hoping to carry...

• Replies: 1
• Views: 1,932
01-07-2016, 12:07 PM
48. ### Variance across different sample sizes

Hello, I want to know how I can interpret variance when the sample sizes are not exact. Here is my problem: I am analyzing daily playing data...

• Replies: 4
• Views: 1,548
01-04-2016, 05:43 PM
49. ### Factor analysis

Dear members, I have 20 questions (Likert 5-point), ultimately I want one variable: "affect". So I ran a factoranalysis, which gives me 4...

• Replies: 1
• Views: 2,392
01-03-2016, 12:15 PM
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: 2,686
01-01-2016, 01:36 PM
51. ### Help with multidimensional scaling for multiple DVs

Hello statistics experts! I couldn't find an answer to my question so I thought that one of you might know: I have 14 risk sources, like nuclear...

• Replies: 1
• Views: 1,735
01-01-2016, 12:39 PM
52. ### Best Methodology for Solving for a Dummy Variable

Hi everyone. This is my first post on the forum and unfortunately is an act of frustration after reading many articles and textbook sections without...

• Replies: 1
• Views: 1,151
12-31-2015, 11:26 AM
53. ### which reference category for factor variables

Hello, I was wondering if there is any systematic rational of how to decide which category of a factor variable (e.g. level of education -primary,...

• Replies: 3
• Views: 1,478
12-30-2015, 11:51 AM
54. ### What is the purpose of inferential statistical tests when you already have parameters

Hello, I'm an undergraduate political science student, and I am working on my senior thesis. I've collected data on a small population (N = 129)....

• Replies: 2
• Views: 1,230
12-29-2015, 11:15 AM
55. ### Should I be using a MANOVA?

Hi all, I apologise in advance if I explain this poorly - this is all somewhat new to me. I'm currently doing a small piece of classroom research...

• Replies: 7
• Views: 1,261
12-29-2015, 06:40 AM
56. ### normal distribution

Hello I have two separate population (sick/ not sick), that I wanted to check if a specific variable (cognitive variable- general mind wandering...

• Replies: 4
• Views: 2,321
12-29-2015, 05:16 AM

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