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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: 18,721
10-11-2014, 12:02 PM
1. ### Need guidance in determining how to analyze my data

Hi all, I've collected all of my data (n = 350) for my Master's thesis and I'm having trouble analyzing it using SPSS. Compounding my troubles is...

• Replies: 1
• Views: 3,155
10-25-2011, 03:44 PM
2. ### What test?

HI! Thanks to anyone that is reading this!! I am a masters student and I am trying to figure out what test I should use to analyze some of my...

• Replies: 1
• Views: 2,206
07-26-2008, 10:26 PM
3. ### Age and DNA methylation data: HELP NEEDED

I have data on patient Age as well as change in % DNA methylation levels for promotor regions. I seek to understand the impact of Age on the % change...

• Replies: 1
• Views: 1,429
12-08-2013, 11:21 AM
4. ### Bonferroni correction in multiple linear regressions: HELP NEEDED

Hi, I'm running the following regression in R for 16000 promotors and one Phenotype (let's say Systolic Blood Pressure, RR_sys): lm (RR_sys ~...

• Replies: 0
• Views: 2,582
12-14-2013, 08:01 AM
5. ### Tests for nonnested models (Vuong, Clarke)

When comparing generalized linear models, do the Vuong and Clarke tests require that the response distributions be the same? For example, could I...

• Replies: 0
• Views: 3,708
03-12-2011, 01:41 PM
6. ### help with reproducibility and accuracy - influence on sample sze

Statistics query resolved at TalkStats Statistics query resolved at TalkStats Statistics query resolved at TalkStats

• Replies: 2
• Views: 1,225
09-24-2012, 10:38 AM
7. ### 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: 828
07-27-2014, 02:05 AM
8. ### What does "local" mean?

This seems like a very basic question: In a recent working paper I am writing a report on, the authors propose a test that is "locally...

• Replies: 0
• Views: 1,327
05-09-2012, 01:37 AM
9. ### Using variations of ANCOVA for non-normal distributions

My first question here, hope to be relevant to the community. Im into CS course and a total rookie on statistics, so let me know if more detail is...

• Replies: 0
• Views: 958
03-29-2012, 05:15 PM
10. ### Using variations of ANCOVA for non-normal distributions

My first question here, hope to be relevant to the community. Im into CS course and a total rookie on statistics, so let me know if more detail is...

• Replies: 0
• Views: 1,686
03-29-2012, 04:28 PM
11. ### Calculating abnormal returns with the calendar time portfolio approach

Hey guys, I want to conduct an event study and since there is a lot of overlapping of the observation windows, I want to use the calendar time...

• Replies: 0
• Views: 4,637
09-20-2013, 03:19 AM
12. ### Absolute or relative changes?

I would like to compare the changes in salt excretion caused by a saline infusion in a group of patients studied under high sodium and low sodium...

• Replies: 0
• Views: 2,967
06-16-2009, 04:57 AM
13. ### Which test should I use?

Hi I made repeat measurements of depth and velocity at ~700 locations in a river at three different flow rates. The data was clustered at each...

• Replies: 1
• Views: 2,241
03-09-2009, 02:33 PM
14. ### Planned 3x2 Factorial Design - PROBLEM!

Hi, I'm looking at crop yield in relation to nitrogen supply and chilling duration. My original experimental design was to have two IVs, the...

• Replies: 1
• Views: 1,797
05-19-2014, 11:54 AM
15. ### Can Factor Analysis be used for non normal distribution ?

Hi My questionnaire is based on 300 respondents opinion on the benefits of implementing of policy changes for which I had used5 point Likert's...

• Replies: 3
• Views: 1,627
04-01-2015, 12:43 PM
16. ### 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: 2,542
08-11-2012, 12:48 PM
17. ### Normality assumption test statistic for independent sample t-test (SigmaPlot output)

I'm using SigmaPlot12 to compare the means/medians of two populations. First, I run the Mann-Whitney Rank Sum Test. The software recommends using...

• Replies: 0
• Views: 4,321
06-14-2011, 11:00 AM
18. ### How to detect statistically significant change in trend?

Suppose I have two time series (Series1 and Series2) which are identical from timePeriod -200 to timePeriod 0. Say that in timePeriod 0 they are both...

• Replies: 0
• Views: 2,222
05-24-2013, 03:03 PM
19. ### Population vs sample in observational study

Hi, I am trying to measure the effect of a treatment on a group which has not been randomly selected. I am using the propensity score matching...

• Replies: 0
• Views: 1,673
08-24-2014, 07:59 PM
20. ### Best method for analysing repeated measures data to show correlation

Hello Thanks in advance for you help. I am currently conducting an experiment and would like to get opinions on the best way to go about...

• Replies: 0
• Views: 1,142
05-23-2013, 09:43 AM
21. ### Finding Relationships with Crosstab Data

first off, I am still a newbie when it comes to modeling, so please bare with me if the answer is completely obvious! I have been given some...

• Replies: 4
• Views: 2,090
06-25-2013, 04:52 PM
22. ### Correct statistical test to compare multiple rates

Hi, I am trying to determine whether the risk of dying on any one day is higher than other days for patients in hospital. I have calculated the...

• Replies: 0
• Views: 964
07-20-2016, 03:38 PM
23. ### Using Factor Scores in Discriminant Analysis

I am doing research on whether corporations that engage in earnings fraud can be identified up to three years before the fraud occurs. My end result...

• Replies: 3
• Views: 830
06-21-2016, 04:40 PM
24. ### Pilot Test Return Rate

I am working on developing a survey with 300 participants. The new survey instrument must be pilot tested. I am planning on running a pilot of 30...

• Replies: 0
• Views: 1,727
05-05-2011, 05:16 PM

I am an elementary school teacher and know next to nothing about statistics. It's been over 15 years since I was in a statistics class. I am working...

• Replies: 1
• Views: 2,789
02-21-2009, 05:37 PM
26. ### bounds of beta distributions

I'd like to estimate the lower and upper bounds of a general beta distribution, using 5 and 95 percentiles. I already know how to estimate the mean...

• Replies: 0
• Views: 2,147
08-20-2009, 11:20 AM
27. ### Need help in how to structure my data in SPSS

Hi there, I am confused on how to input my data in SPSS. I have 2 questionaires for my research. Questionnaire 1 have 3 questions for...

• Replies: 1
• Views: 2,073
10-28-2011, 03:11 AM
28. ### Hypothesis testing with Maximum A Posteriori (MAP) estimators

Hi, Does anyone know of any work on hypothesis testing with MAP estimators? The likelihood ratio test is based on asymptotic distributions, so I...

• Replies: 0
• Views: 1,720
cfp
04-04-2012, 05:46 PM
29. ### What kind of statistical analysis to use?!?!

I am a grad student working on a research project and I'm not sure what kind of tests to run in SPSS. I have a set of test scores and a set of 4...

• Replies: 2
• Views: 1,797
07-21-2011, 12:54 PM
30. ### Identifying subset with maximum averages

Dear all, I am trying to achieve the following task - and I wonder if there are analytical methods in any of the stats packages that can achieve...

• Replies: 0
• Views: 1,366
10-31-2013, 06:16 AM
31. ### What statistical test should I use to check to ratio?

I have data for two sets of sample in the form of frequency of three category.Say A,B & C are three category and I have data for sample 1 as ...

• Replies: 6
• Views: 14,908
02-16-2011, 01:37 PM
32. ### Multifactorial analysis with R integrated TIME

Hi! I'm about to analyze data using a multifactorial analysis with the R (Rcmdr) software and I'm not too sure on how to organize the factor groups....

• Replies: 0
• Views: 1,052
cha
12-22-2014, 05:28 AM
33. ### Any way to test significance?

First off, pardon my novice-level knowledge of statistics. If I make any ridiculous assumptions or whatever, this is why! So I'm doing a bit of...

• Replies: 7
• Views: 3,360
03-07-2011, 02:59 AM
34. ### Modelling the yield from sports bets - Potentially using a mixture of distributions?

Hello all, A friend of mine asked me to analyze some data which comes from placing bets on sports. Having read quite a few threads and seeing how...

• Replies: 11
• Views: 5,560
04-01-2011, 03:35 PM
35. ### large samples and resampling stats

First post here. Mods- please move thread if in wrong place. I am working with a very large dataset (total n = 30,000+) of normally distributed...

• Replies: 1
• Views: 3,293
02-28-2011, 12:51 PM
36. ### A little guideance needed...

First off, I hoped I've posted in the right forum-if not sorry xx I'm working through a sample question regarding a sample of 20 sections of...

• Replies: 3
• Views: 1,962
07-30-2013, 07:15 AM
37. ### how to determine what test to use for a project?

I'm trying to determine if there is a statistical significance in hospital admission rates (asthma and bronchitis) before and after tobacco...

• Replies: 2
• Views: 1,164
03-15-2013, 02:42 PM
38. ### Interesting abstract question - Statisticians pls chk this

I have a massive dataset (10s of millions of rows and 100s of dimensions). The dimensions are of all conceivable data types. How do I arrive at...

• Replies: 0
• Views: 924
03-27-2015, 02:06 PM
39. ### F-test Analyis HELP

I've just carried out an f-test on excel as I want to perform an independent t-test so I wanted to check the equality of variances. I have always...

• Replies: 4
• Views: 2,804
07-16-2011, 03:45 PM
40. ### Using an Independent t-test with Pre/Post data

Hi to all who kindly read this. I've carried out an experiment involving a control and treatment group, and taken pre- and post- data from each...

• Replies: 6
• Views: 4,560
02-08-2012, 08:10 AM
41. ### Non-parametric equivalent of a factorial anova (not repeated measures)?

Hi there. Firstly apologies for the awful spelling in the main title - obviously I meant factorial Secondly hello I am new to this forum and...

• Replies: 16
• Views: 26,126
12-03-2011, 03:52 PM
42. ### 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: 2,554
06-20-2013, 02:19 PM
43. ### Levene's test of equality of error variances Repeated measures

Hello all, RE: Levene's test of equality of error variances Repeated measures...What do I do if one of my time points is significant (not equal...

• Replies: 0
• Views: 3,319
12-18-2012, 04:18 PM
44. ### Package testing using likert scale

We recently finished a survey using a likert scale to compare attributes of consumer packaging(sample question below). The same question was asked...

• Replies: 0
• Views: 2,481
08-19-2011, 04:44 PM
45. ### Analysis of electricity consumsion

Hello @all I want to analyze on how several factors have an effect on electricity consumtion (measured in mw). Before I start to gather the data,...

• Replies: 0
• Views: 1,044
03-19-2013, 03:01 AM
46. ### Plsr

I know PLSR can deal with multiple dependent variables, how about if let say the 2 dependent variables are totally no relation at all, shall we do...

• Replies: 2
• Views: 1,510
06-12-2012, 11:57 AM
47. ### 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: 344
09-28-2017, 02:00 AM
48. ### Trouble with a dichotomous decision study

Any help appreciated: Have a study with video clips and a Yes / No answer. There is a correct answer. There are ~20 (but this can be changed) clips...

• Replies: 0
• Views: 2,754
09-09-2009, 11:10 AM
49. ### What is the point of providing p-values for baseline characterisitics?

I just have a general question about what the point is of have baseline characteristics and then presenting p-values for these. Is the p-value...

• Replies: 3
• Views: 8,304
05-29-2012, 02:13 PM
50. ### Inclusion criteria of participants and internval validity

Hi All, I am having trouble understanding how the inclusion criteria of participants can affect the internal validity of a study. This is my...

• Replies: 1
• Views: 26,165
05-02-2012, 07:15 AM
51. ### comparing multiple means between multiple groups

Hi Everyone, Pretty new to stats and want to make sure that I am running the right stats. I have means (measured in months) from multiple...

• Replies: 0
• Views: 747
08-30-2016, 12:28 PM
52. ### Nonparametric regression

Hi guys, can someone recommend a good source to learn about kernel regression or spline smoothing and perhaps how to compare two plots to each other?

• Replies: 2
• Views: 3,034
11-17-2009, 01:06 AM
53. ### Time Series

Hi everyone, I've been reading some papers that talk about fractality (hurst exponent) in physiological time series (ekg, eeg, gait, etc.). I was...

• Replies: 0
• Views: 3,208
11-23-2009, 03:32 AM
54. ### Propensity score matching - pre-treatment outcome variable

Hi all, maybe this rather a silly question but I have not found anything helpful. I have two groups of samples which are basically a treatment and...

• Replies: 5
• Views: 3,567
12-05-2016, 03:20 PM
55. ### Sample Size Calculation

Hello all, I just recently came across this website and was hoping an intelligent mind could help me calculate the sample size required for a...

• Replies: 1
• Views: 2,201
11-25-2014, 04:53 PM
56. ### Measuring change for longitudinal study

Hi all Is there an analysis method to measure the significance of magnitude change overtime (longitudinal study)? For example: Person A...

• Replies: 0
• Views: 1,569
09-19-2014, 04:37 AM

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