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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: 18,620
10-11-2014, 12:02 PM
1. cronbach alpha for missing data

Hi, I have an indicator which consists of questions 24, 25, 27, 29, 30, 31, and 32. I am in the middle of determining internal consistency and...

• Replies: 0
• Views: 2,452
10-07-2014, 06:25 PM
2. Cronbach's alpha

Help please! What data do I need to work out the cronbach alpha coefficient? I have 30 responses to a large number of Likert-type questions. We want...

• Replies: 5
• Views: 3,635
10-14-2011, 05:01 AM
3. Cronbach's alpha and Cohen's Kappa (CA & CK)

Is there any effective difference between CA and a weighted-CK? Anyone any thoughts?

• Replies: 2
• Views: 10,584
11-15-2015, 04:32 PM
4. Cronbach's Alpha if items are not exposed equally..

Can Cronbach's Alpha be calculated for a survey in which number of questions are not equally exposed to users? Say, I have 40 questions in a test,...

• Replies: 1
• Views: 1,276
10-21-2013, 08:06 AM
5. Cronbach's alpha with weighted data

Hi I have a test whose reliability I want to calculate, using Cronbach's alpha. The first 18 questions are scored 0 or 1 (right or wrong). The...

• Replies: 0
• Views: 2,840
09-29-2011, 06:03 AM
6. Cronbach's alpha: Same scale, multiple scenarios... special calculation needed?

Hi everyone, I'm working on data for my dissertation and had a question regarding Cronbach's alpha. In a pretest, I asked just over 100 subjects...

• Replies: 6
• Views: 1,548
01-28-2015, 02:46 PM
7. Cross sectional T-test, event-study

Hello, I'm new to the forum and I have tried searching for it but couldn't quite find my solution. I'm working on a paper involving an Event study...

• Replies: 0
• Views: 4,876
01-27-2014, 07:09 PM
8. Cross-estimating the independent variables to exclude outliers

I am working on a dataset where some of the independent observations have measurement issues (i.e. mixed feet and metric). I'm considering...

• Replies: 0
• Views: 5,599
03-08-2014, 08:49 AM
9. cross-tabs or non-parametric independent sample t-test

I have conducted a survey to determine if there is a significant difference in the number farmers and non-farmers which agree to a specific farming...

• Replies: 7
• Views: 1,898
08-17-2015, 01:32 PM
10. cross-validation of prognostic model (test-set method)

I am cross-validating a logistic regression model using the test-set approach, with 70% training data in the test set and 30% in the validation "set"...

• Replies: 0
• Views: 2,370
08-09-2011, 08:23 AM
11. Crossover design or Randomised Block Design?

I have two groups of rats (group A and group B). 'Pretreated' means they were injected beforehand (with either memantine or saline). They were then...

• Replies: 2
• Views: 1,470
12-22-2013, 07:15 PM
12. crosstabs -

I have a crosstabs with two categorical variables. 6 columns x 4 rows. Data are proportions, not means. Basic chi-square shows me that the...

• Replies: 0
• Views: 3,195
04-05-2011, 03:52 PM
13. Cumulative heat units - what is a valid way of determining difference between sites

Background: I work for a blueberry grower. The accumulation of heat units is important in understanding and predicting the development of the plant...

• Replies: 0
• Views: 2,216
07-20-2014, 09:23 PM
14. 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: 5,163
10-20-2013, 11:17 PM
15. Current Commentary Study

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

• Replies: 2
• Views: 2,853
04-30-2009, 07:52 AM
16. Curve parameters

Hi all, I have a curve with an intercept, slope, and quadratic factor. Now, I would like a draw a curve that is one standard deviation above this...

• Replies: 8
• Views: 2,738
03-13-2012, 03:10 PM
17. Customer problems vs R&D efficiency -> Statistic needed

Hi guys, I have one case for which I need to find out how to prepare some statistic but to be honest I do not now how to approach the issues. ...

• Replies: 1
• Views: 1,017
11-24-2012, 07:55 AM
18. Customer satisfaction survey (data analysis)

Hi, We are doing a customer satisfaction survey on our school canteen. We are finished with the data collection and is now considering what...

• Replies: 5
• Views: 3,173
11-28-2012, 02:13 AM
19. Cut-off

I am reading an article where 5 has been set as a cut-off score. No > or >= symbols are given, and I don't know whether a score of 5 would identify...

• Replies: 0
• Views: 2,538
05-12-2009, 08:03 AM
20. Cut-off criterion for likert scales

Dear all, I really need some help solving the following problem: I am currently finalizing my master thesis and I am still insecure about a...

• Replies: 0
• Views: 5,194
11-18-2010, 04:47 AM
21. 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: 5,739
09-16-2008, 02:22 AM
22. Data analysis

Hi, please can someone help me out. I would like to know if I have performed the correct analysis for my study. I am comparing direct response...

• Replies: 0
• Views: 3,247
11-21-2016, 01:51 PM
23. Data analysis : replication and pseudoreplication

I have several questions concerning analysis of data, especially when there are replications and/or pseudoreplications. First, I read an example...

• Replies: 0
• Views: 2,237
10-23-2014, 08:41 PM
24. data analysis for likert scale

i have a group of variables being measured on a likert scale from 1 to 5, the agreement or disagreement of these variables will help me know the...

• Replies: 2
• Views: 1,656
10-01-2012, 08:39 AM
25. 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: 1,026
02-26-2016, 03:07 AM
26. Data Capture

I'm not sure if this is the correct place to ask this question. I have a support team in my office and I want to understand why people are calling...

• Replies: 1
• Views: 1,392
03-06-2015, 05:27 PM
27. Data collection

Hi everyone, i have a simple question that i actually cant get my head around (have been working on this assignment far to long and hard!) The...

• Replies: 0
• Views: 968
08-05-2013, 11:39 PM
28. Data Collection

I am an education major and am lost in my research class! I have the research question of, "How does classical music playing in the background...

• Replies: 1
• Views: 1,273
03-15-2017, 07:28 AM
29. Data collection gone awry -- now what do I do?

Trying to keep this as brief as possible ... I handle the stats for a pilot project for my employer (a government agency). We're trying to...

• Replies: 0
• Views: 2,332
03-30-2010, 02:21 PM
30. Data collection???

First off apologies if I should have just posted this in my other thread. I am working with some cycle hire data from the Barclays Bicycle Hire...

• Replies: 2
• Views: 1,467
03-22-2012, 07:52 PM
31. data comparison from questionnaire in different languages

Hello, I am working for an NGO helping migrant workers. We want to conduct a study assessing the mental health of migrant domestic workers in...

• Replies: 1
• Views: 1,186
06-13-2013, 09:26 AM
32. Data Groveling

I am in the market for biomedical assay data that has lower detection limits and preferably be longitudinal. Someone asked me to find some...

• Replies: 0
• Views: 1,835
04-01-2010, 06:05 PM
33. data not normally distributed

Hi, I had originally intended to use a mixed repeated measures anova to test my data, however unfortunately it is not normally distributed and so...

• Replies: 1
• Views: 2,099
08-04-2011, 10:19 AM
34. Data request (if that is allowed) concerning university enrollment figures in the USA

Hi Everybody, I am struggling finding data that I am sure exists, so I figured I would reach out for help (if this sort of thing is not allowed...

• Replies: 2
• Views: 1,095
06-19-2013, 07:58 PM
35. Data Set of Pattern Recognition

I need help in looking for a data set for classification. The kind of data I am looking for are where measurements are available from experimental...

• Replies: 1
• Views: 2,143
01-09-2012, 03:15 AM
36. data simulation help

Hi all, How do I generate count data from a gamma distribution, preferably using SAS? For example, I assume that frequency of persons born in...

• Replies: 2
• Views: 1,926
08-05-2011, 09:45 PM
37. Data transformation and kruskal-wallis

Hi! It's the first time I'm posting in your forum! I'm using statistics in a university project about operations research, and I'm having some...

• Replies: 2
• Views: 2,211
02-28-2012, 12:00 PM

Can anyone suggest a guide or link for more information on the transformation or non normally dirtibuted data? many thanks yoma

• Replies: 19
• Views: 7,535
08-16-2010, 11:59 AM
39. data transformation software

Does anyone know of any software that will transform data to normality for me? specifically first one: lognormal second one:burr(4p) third one:...

• Replies: 2
• Views: 3,038
08-17-2010, 01:08 PM
40. Data Transformations

I'm working with 15 variables or so in a dataset (n=5,000ish) and one of the variables has a strong negative skew to it (skew = -.947, std. error =...

• Replies: 3
• Views: 2,020
04-08-2013, 05:53 PM
41. Dealing with censored dates as regressors

I'm estimating a linear model, with one of the independent variables being a date of appearance. I consider the date to be a minimum date of...

• Replies: 2
• Views: 850
nbi
04-13-2017, 11:31 AM
42. Dealing with missing values in cluster analysis

I am currently looking for a cluster algorithm to deal with a large amount of systematically missing values. In particular, I need to cluster...

• Replies: 5
• Views: 1,146
07-16-2016, 06:53 AM
43. Dealing with regression to the mean

If I have two time points T1 and T2 and separate the groups based on their performance at T1 (High v Low), then after treatment assess their...

• Replies: 4
• Views: 2,978
01-12-2017, 10:52 PM
44. dealing with unequal sample sizes... can anyone help please?

Hello, I am comparing men and women on outcomes of their diagnostic assessment (autism). there are approx 600 men and 200 women. I have used...

• Replies: 7
• Views: 2,498
11-18-2014, 04:14 AM
45. Dealing with unknown dependencies between variables

Hi! I have a system where I'm studying 3 different diseases, however they share some pathological similarities. There is no data on them being...

• Replies: 2
• Views: 2,012
02-26-2017, 10:51 PM
46. Decision Tree with Binary Target

Hello, I have a dataset with a number of inouts and a binary target. I want to build a decision tree model. SAS states that the predictions can be...

• Replies: 1
• Views: 1,263
09-24-2012, 09:56 AM
47. 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: 8,505
09-15-2008, 09:46 AM
48. 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: 1,936
02-13-2016, 08:13 PM
49. Degrees of freedom for Chi2 normality test

I have found mixed information in regard to the number of degrees of freedom used to evaluate the chi2 statistics derived to check the normality of a...

• Replies: 3
• Views: 2,870
09-02-2014, 12:49 AM
50. demographic stats for choosing where to live

Given the vast amount of demographic information on sites like: http://quickfacts.census.gov/qfd/index.html Could I could take a subset of...

• Replies: 2
• Views: 2,339
01-01-2010, 09:35 PM
51. Dependance between categorical variables in a whole population

Hello, I have a population of 507 documents (which represent the entire phenomena studied at a give time period) from which a series of variables...

• Replies: 0
• Views: 755
09-17-2013, 07:39 PM
52. dependent cases in logsitic regression, any recourse?

I'm hoping to use logistic regression to analyze a 2x3 repeated-measures factorial design. The IVs are both categorical. The DV is dichotomous...

• Replies: 0
• Views: 2,163
06-08-2010, 01:52 PM
53. dependent correlations significance test

Hi all, I have a test score with which I want to explain another test difference score (post-pre), under 4 conditions. All conditions are...

• Replies: 0
• Views: 1,418
01-19-2014, 03:29 AM
54. Derivation of OLS residuals and asymptotic properties

Hello, Im stuck with this questions. Its asking for the derivation of asymptotic properties of 1/n*(sum of ehat^3) where ehat is the residual of...

• Replies: 0
• Views: 1,002
03-11-2015, 07:45 PM
55. deriving critical level of significance for Bonferroni correction in my data?

We have conducted an experiment where we test ability to detect weights using two different methods using a repeated measures design. Each...

• Replies: 1
• Views: 1,360
11-15-2012, 10:10 AM
56. Deriving meaningful information from a set.

Hello all, I was working for my statistics class and kind of extrapolated a problem. I think sharing this with this forum will help in coming...

• Replies: 5
• Views: 2,808
01-23-2011, 04:22 PM
57. Describing a curve in order to compare with species abundance

Hi, I was wondering if there was an established method / algorithm for describing a curve (in this case, grain-size data) in order to compare...

• Replies: 0
• Views: 3,430
04-11-2008, 05:31 AM

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