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Threads 901 to 960 of 3193

# 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: 18,657
10-11-2014, 12:02 PM
1. ### Which statistic should i use?

Hello, I don't know which statistic i should use for my situation: I have 30 spaceships with different caracteristics. I need to buy one,...

• Replies: 3
• Views: 154
CRD
09-28-2017, 11:53 AM
2. ### Time Series or GARCH? Can't decide..

Hello, for a research thesis I want to compare returns of different asset classes with another. Think: stock indices, bond indices, a commodity...

• Replies: 3
• Views: 1,734
09-18-2016, 09:24 AM
3. ### [Finite population correction(FPC)] Did I discover “FPC(nHr)”?

talkstats members are knowledgeable. Anybody knows there is any precursor already published FPC(H^n_r). The journals rejected my paper. Finite...

• Replies: 3
• Views: 2,107
09-07-2016, 09:09 AM
4. ### Monte Carlo for Weibull and Lognornam distributions in R

I am involved in a project which needs statistic and computer science. I am more of a computer guy so I appreciate any statistical help. I am doing...

• Replies: 3
• Views: 1,243
09-12-2016, 03:26 AM
5. ### How to merge two data sets with varying date intervals?

I'm sure this problem isn't unique. I have two sets of data, both \$ values and I want to add them together and plot them on a chart. The problem...

• Replies: 3
• Views: 1,743
10-09-2016, 07:21 AM
6. ### Why "controlling for X" studies may be fatally flawed

I came across this paper this week, which was quite an eye-opener for me, so I wanted to share. We are probably all familiar with "controlling for...

• Replies: 3
• Views: 2,793
10-19-2016, 06:45 PM
7. ### Anova without intercept?

Is it possible to perform Anova without an intercept? In the software, there is an option to check the box that says “no intercept”. Once I do...

• Replies: 3
• Views: 3,518
10-31-2016, 03:02 PM
8. ### Question about parametric and nonparametric tests and non-probability sampling

I think I am pretty clear on the differences between parametric and nonparametric tests and which is more appropriate to use given the data you have...

• Replies: 3
• Views: 3,159
11-03-2016, 04:56 PM
9. ### Question - Is Simpson's Paradox the same as spuriousness

Hi all, I am currently trying to learn about research methodology by using the book of Dooley called Social Research Methods. I am however a...

• Replies: 3
• Views: 3,328
11-08-2016, 08:35 AM
10. ### sure independence screening in clustering

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• Replies: 3
• Views: 3,029
11-23-2016, 01:01 AM
11. ### Probability of Events in Equations

Hello, This may be an easy question, but I would like to know how to incorporate the probability of an event in a linear (or non linear)...

• Replies: 3
• Views: 3,682
12-12-2016, 09:48 AM
12. ### Repeated atypical measures..help needed

Hey all, thanks again for the great group and assistance. I have a research of 30 patients (one sample) which performed cognitive tests in the...

• Replies: 3
• Views: 1,271
05-01-2017, 06:47 PM
13. ### SPSS Correlation of single variable and independent variables

Hello, I am working in spss 23 and I'm stuck. I have data for which I am attempting to determine if certain color of a personality (there are 4...

• Replies: 3
• Views: 622
04-22-2017, 02:48 AM
14. ### Which statistical test shall I use please? Thanks a lot

Hi I am trying to compare 2 groups- one that has had surgery on the same leg (37) vs opposite leg (48) and to compare whether there is any...

• Replies: 3
• Views: 3,537
12-29-2016, 08:42 AM
15. ### how do we estimate regression parameters in survival analysis

Dear All, I would like to ask how to estimate regression parameters(Beta) in Accelerated Failure Time Model? Does anybody knows any resources?...

• Replies: 3
• Views: 1,354
04-02-2017, 10:43 AM
16. ### Finding my control group PSM, Matching or regression model and correct for confounder

Hey there, First off I'm hoping I'm posting this in the right place. I'm doing research where there is a patient group of n=9 that underwent...

• Replies: 3
• Views: 1,601
03-02-2017, 09:41 PM
17. ### Experimental design: ANOVA? help!

Hello, I have to analyze one paramater (lipid content) of seeds from 5 different cultivars. I am planning to do two independent analysis of the...

• Replies: 3
• Views: 1,537
03-05-2017, 09:09 AM
18. ### Median or Mean vs Data distribution

Hi, I am stuck at this point in my thesis in selected between Median and Mean. My data and work: I have a set of data X, and for each data y...

• Replies: 3
• Views: 3,210
12-26-2016, 09:50 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: 2,525
01-11-2017, 06:17 AM
20. ### HELP! Is using cross section semi series data correct?

Hello all! It is so nice to know that there is such a forum to discuss statistical matters. Allow me to introduce myself. My Name is Yohanes...

• Replies: 3
• Views: 686
07-11-2017, 01:58 PM
21. ### Testing Significance of Group Differences with Non-Normal Data

Hi.. I need help with deciding which statistical technique to use for my data My research design involves 2 Independent Variables with 2 levels each...

• Replies: 3
• Views: 332
09-28-2017, 02:00 AM
22. ### Grouping Observations

Hello! New to the forum here and looking for help. I have 3 separate "Urban" monitoring locations. 10 observations were made at each location. ...

• Replies: 3
• Views: 221
09-29-2017, 03:59 PM
23. ### Meta-analysis for Pre vs Post (Which SD to use)

Hello everyone, I have extracted data from longitudinal studies that have collected data on pre and post time points. All studies have same time...

• Replies: 3
• Views: 152
10-16-2017, 07:58 AM
24. ### Multinomial logistic regression

I have been carrying out some analysis using multinomial logistic regression and I would like to compare two competing models to see which is the...

• Replies: 2
• Views: 3,940
06-29-2008, 08:07 AM
25. ### time variables in a regression

Hi all, I'm looking at a linear regression model using the data on wars in the 20th century. There are two time variables on the right-hand...

• Replies: 2
• Views: 6,798
07-29-2008, 12:15 PM
26. ### Which test to use?

I'm trying to compare one data point to a distribution to see if that one data point fits into the distribution. The distribution is not a normal...

• Replies: 2
• Views: 2,865
08-04-2008, 11:28 PM
27. ### Coding Open Ended Questions

Hi, Can anyone tell me where I would begin if I wanted to code some open ended questions? People tell me it's easy, but I don't know; where or...

• Replies: 2
• Views: 9,270
08-19-2008, 10:32 PM
28. ### Regression Equation

Hi there, Could someone please tell me which values do the following symbols represent in the regression equation: ∆R2 (R Square Change?) ∆F (F...

• Replies: 2
• Views: 19,063
08-10-2008, 08:16 PM
29. ### Repeated Measures ANOVA with a Continuous Variable?

Hi, I'm trying to run a repeated measures ANOVA. There's a continuous variable that's affecting my data, that I need to control for. I tried...

• Replies: 2
• Views: 9,241
08-27-2008, 04:11 PM
30. ### What kind of ANOVA is this?

I'm doing an MRI research study on source memory and aging using emotional stimuli. This is probably a fairly basic question, but I'm not sure what...

• Replies: 2
• Views: 2,355
08-21-2008, 12:36 PM
31. ### Anova

Develop two-null hypothesis tests to ascertain if there are any statistical variances in the averages of bus route times and any statistical variance...

• Replies: 2
• Views: 4,767
09-02-2008, 03:38 AM
32. ### Deck of cards: Odds of being dealt 3 of a suit?

I'm trying to figure out an algorithm to calculate the odds of being dealt 3 of a particular suit in a multi deck situation. Assume we have 3...

• Replies: 2
• Views: 8,508
09-15-2008, 09:46 AM
33. ### Cut-off Points in Linear Discriminant Analysis

Everyone can discuss about the cut-off points in linear discriminant analysis. I know how to calculate it when there are 2 groups. But, more than 2...

• Replies: 2
• Views: 5,747
09-16-2008, 02:22 AM
34. ### What are age effects?

Any thoughts? I've been asked to find these with some data I've been working with.

• Replies: 2
• Views: 2,350
11-18-2008, 10:33 AM
35. ### Quick Question about Null Effects in ANOVAs

Hi all, I just have one quick question: I've been analysing a reasonably large experiment recently using a repeated-measures ANOVA (with a...

• Replies: 2
• Views: 3,289
10-19-2008, 06:06 AM
36. ### finding data trends

I have a dataset that includes four replicates of 7 different concentrations of pesticides applied to a plant. After exposure the number of offshoots...

• Replies: 2
• Views: 3,570
11-16-2008, 03:31 AM
37. ### 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: 2,501
11-17-2008, 12:28 PM
38. ### Survey analysis help: what tests to run?

I'm doing research investigating why South Korean students are reluctant to speak English in ESL classes. I've developed a survey with nine...

• Replies: 2
• Views: 5,508
11-19-2008, 05:28 AM
39. ### Factor Analysis help--Senior Thesis

I am an undergraduate and working on my senior research project. I am doing a study of the construct validity of a critical thinking test using...

• Replies: 2
• Views: 3,909
11-30-2008, 07:50 AM
40. ### 2 x 4 Factorial Design and contrasts...

Question... I have a 2 (gender) x 4 (Drug Dose) design Gender - Male - Female Dose - 200 - 400 - 600 - 800

• Replies: 2
• Views: 12,262
11-30-2008, 11:37 PM
41. ### Help with analysing data

I have submitted a questionnaire indicating respondants to give their ranking in accordance to their preferred weighting - for example if they gave...

• Replies: 2
• Views: 2,428
12-03-2008, 08:12 AM
42. ### Hierarchical Cluster Analysis: which method to use?

Hi all, I have a data set consisting of 32 records (linguistic constructions) and count data on how often each construction is used for each of 5...

• Replies: 2
• Views: 5,145
01-29-2009, 04:49 AM
43. ### reporting statistical results

I am wondering if this is the correct way of reporting significnat differences between correlations: "Conversely, males’ self-serving cognitive...

• Replies: 2
• Views: 4,051
02-09-2009, 10:12 AM
44. ### Logistic regression - different cutpoints for classification and probability?

I was reading an article on logistic regression tonight, and I noticed the following: "Logistic regression can be used to classify observations as...

• Replies: 2
• Views: 8,653
02-24-2009, 05:55 AM
45. ### Jackknife

I tried to find a specific example of an application of the 'jackknife' command on google, but didn't find any so far. Someone has one? For...

• Replies: 2
• Views: 4,692
03-15-2009, 10:11 AM
46. ### Need large data sets

Hello, I'm doing some Q/A work on a new app for data visualization. I can generate my own random data sets, but I'd like to use some real-world...

• Replies: 2
• Views: 2,749
03-10-2009, 05:55 PM
47. ### stat treatment for yes no questions

I'm an education student and doing a thesis on vocabulary competence of select students. I only know basic statistics. What statistical treatment is...

• Replies: 2
• Views: 9,587
03-06-2009, 02:57 PM
48. ### Are there any post hoc analyses for Chi Square data?

Hi, I've got some Chi square results that I would like to analyze post hoc. Any ideas? I've got categorical data. Kind regards Brionny

• Replies: 2
• Views: 5,660
03-10-2009, 04:57 PM
49. ### might be a stupid question...

I am comparing 2 groups (matched sample) with t-tests and am noticing that there is no significant difference. However the st. deviations of each...

• Replies: 2
• Views: 3,690
03-16-2009, 11:07 AM
50. ### t-tests or mann-whitney??

Hello, I have a n=12 sample (and a matched-sample of 12)... I was planning on using t-tests, but now reconsidering it. Would it be correct to use...

• Replies: 2
• Views: 8,522
05-03-2009, 06:41 PM
51. ### Suppressor

Hi, I am attempting to conduct a regression analysis in a study examining patient and caregiver variables and their impact on formal care...

• Replies: 2
• Views: 4,134
06-17-2009, 04:18 PM
52. ### Current Commentary Study

Hi what is it a Current commentary study ??? What does it mean ??? Regards

• Replies: 2
• Views: 2,868
04-30-2009, 07:52 AM
53. ### Is there a minimum number of subjects required for a t-test?

Hi everyone, I am carrying out a piece of research on the effects of heel pain on the way we walk. I have two groups, 8 in the heel pain group...

• Replies: 2
• Views: 18,790
05-08-2009, 03:43 AM
54. ### ANOVA v t-test

My understanding is that the t-test is a special case of a oneway ANOVA. I am confused by highly discrepant results when comparing the means of 2...

• Replies: 2
• Views: 3,990
05-10-2009, 09:12 PM
55. ### what test to use?

I have a data set consiting of 50 vegetation plots. I have five possible categories for vegetation cover. Each category can range form 0 to 100% with...

• Replies: 2
• Views: 2,626
05-22-2009, 09:00 AM
56. ### Pairwise comparisons

If anyone has ANY idea at all i would be most appreciative My lab report includes pairwise comparisons, I have the SPSS output before me but I...

• Replies: 2
• Views: 29,407
06-15-2009, 08:05 PM
57. ### I have no idea where to start!!

I need to analyse data for research--- There are 3 outcomes (1,2,3) and two companies (a,b) with 3 departments each (a1,a2,a3 and 1b,2b,3b). I...

• Replies: 2
• Views: 2,419
08-05-2009, 05:36 PM
58. ### mathematics (is it a differential equation?)

Hi there, Well I know I'll sound rusty in mathematics but here I go: Let a vector b=. I know the derivatives dQ/db0 and dQ/db1. I am...

• Replies: 2
• Views: 3,230
08-30-2009, 03:33 PM
59. ### Methodology for building a model based on available time series

Hi everyone For my Msc research I am trying to estimate a bus demand model based on anuall historical data of demand itself and other explanatory...

• Replies: 2
• Views: 2,146
10-26-2009, 12:47 PM

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