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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: 18,766
10-11-2014, 12:02 PM
1. ### HMLR and ANOVAs instead of structural equation modelling

Hi,* I have two studies within my thesis; The first is cross-sectional, and tests a theoretical framework of leadership - it explores the...

• Replies: 0
• Views: 603
06-06-2017, 03:15 PM
2. ### Homogeneity of Variance

Hi all, I want to test the Homogeneity of Variance (HV) before conducted MANOVA, and I have to groups (different nationality; Arabs and British)...

• Replies: 1
• Views: 1,966
11-26-2011, 06:46 PM
3. ### Homogenity and Heterogenity

Hello everyone. I have read that Homogenity and Heterogenity are used for population that have/do not have accordingly the same variance σ^2. Does...

• Replies: 1
• Views: 2,701
05-08-2010, 01:09 AM
4. ### homogenity of variance

I have 4 groups in a study that suffer from homogenity of variance. I use STATA. Should i trasnform the data? and how do i do that? is a log...

• Replies: 3
• Views: 4,302
09-22-2011, 02:58 PM
5. ### Hosmer_ Lemeshow test

Dear teachers, In SPSS I ran a uniariate logistic regerssion to use the statistically significant ones in the multivariate logistic regression. I...

• Replies: 3
• Views: 2,890
01-17-2013, 05:15 PM
6. ### Hot deck imputation issues

Background: I had a data set containing 212 observations with a lots of missing values. Most of the IVs and DVs are categorical (DVs are ordinal)...

• Replies: 0
• Views: 1,515
01-28-2013, 02:12 AM
7. ### Hotelling's T2 test and chi2 distributions

For the 1-2 weeks I've been trying to decompose the T2 statistic into two independent chi2-distributed statistics, but have had no success. I'm...

• Replies: 0
• Views: 754
04-23-2017, 01:34 PM
8. ### How can I analyse this data is the best way possible?

How can I investigate the theory that a relationship between two variables, X and Y is 'Y in proportion to X^3/4' within a population where I can...

• Replies: 0
• Views: 865
04-17-2016, 04:46 AM
9. ### How can I analyse this data?

Hi guys, I'm currently doing research for my dissertation. Background info: Generally speaking, I am studying perceptions of different factors...

• Replies: 1
• Views: 1,285
03-02-2012, 04:44 PM
10. ### How can I best analyze this data

I have some data I am trying to analyze but was hoping to get some stats help with it. I'm not sure what the best way to analyze it is. I'm...

• Replies: 4
• Views: 2,494
04-13-2016, 04:04 PM
11. ### How can I statistically prove which data is more reliable

We have a task to statistically identify which data set is more reliable among the two sources. Case background: Design function releases drawings...

• Replies: 0
• Views: 2,546
11-26-2016, 12:56 AM
12. ### How do i add 5 spss freq count tables together?

Please can anyone help? I use spss (DOS version) and need to add five variables together. THey are all the same and contain the same values. When...

• Replies: 1
• Views: 4,229
03-01-2009, 07:22 PM
13. ### 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: 946
01-24-2016, 10:34 PM
14. ### How do I calculate the Sample Size for this type of Survey?

Hi all, I need to calculate the sample size for a survey I will be undertaking soon. The target population will be the clients of 8 hotels,...

• Replies: 0
• Views: 1,028
03-15-2013, 11:53 PM
15. ### How do I compare different demographic groups that did the same survey?

Hi, this is my first post so apologies in advanced if I'm asking things incorrectly! I'm doing a market research course and we've conducted a...

• Replies: 0
• Views: 2,870
05-16-2011, 06:11 AM
16. ### How do I define this research design?

This is a fairly straightforward question but I can't seem to find a good definition to categorize some review board paperwork I need to do. ...

• Replies: 1
• Views: 1,022
04-22-2014, 08:52 PM
17. ### How do I determine best choice based on confidence values?

I have this problem I don't know how to solve. I have X variables. One of them is a key value. I have different data sets, each containing rows of...

• Replies: 0
• Views: 1,391
11-21-2014, 12:08 AM
18. ### How do I determine the Correlation Coefficient from a best fitting equation.

I'm confused about how to determine the correlation coefficient after you find a linear regression line formula. I'm porting some linear...

• Replies: 0
• Views: 1,839
08-11-2011, 11:32 AM
19. ### How do I report marginal means of a two-way unrelated ANOVA correctly? APA-style

Hello, after doing a two-way unrelated ANOVA (General Linear Model > Univariate) on SPSS, I am confused how to report the output correctly. My...

• Replies: 0
• Views: 6,533
08-21-2011, 05:46 PM
20. ### How do I use PERMANOVA/interpret the results

I am doing this research project comparing the snail community across two species of sea grass. Ten sample quadrats were collected from each sea...

• Replies: 1
• Views: 3,192
10-24-2015, 07:52 AM
21. ### How do we compare medians?

Hi, I have a project whereI have to compare short term and long term medians of a given data over four not consecetive years, like 1999, 2007,...

• Replies: 2
• Views: 7,151
12-04-2010, 04:43 AM
22. ### 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: 3,371
12-04-2010, 05:28 PM
23. ### 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: 1,386
04-02-2017, 10:43 AM
24. ### 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: 2,227
08-08-2011, 03:18 AM
25. ### How do you convert yearly and period CPI to that of a rolling basis?

Hi Guys, I am doing research and currently I am trying to utilize Consumer Price Index data. I have two sets of consumer price data, one that...

• Replies: 0
• Views: 1,028
04-23-2012, 04:35 AM
26. ### How does observation error effect a minimal sample size for a t test?

Hello, I calculate minimal sample size to compare means of two groups (different treatment) of datapoints by a t test. For continuously...

• Replies: 7
• Views: 2,005
10-30-2012, 05:54 PM
27. ### How does one develop statistical models to compensate for weakness in public data?

Hi everyone. I have an interview coming up and the role is data centric. I have a strong knowledge of data and management, however I have never...

• Replies: 7
• Views: 1,114
08-24-2016, 11:08 AM
28. ### How does sampling reduce selection bias?

Hi everyone, I'm struggling to understand theoretically how sampling reduces selection bias. Take the following example: Supposing there is a...

• Replies: 1
• Views: 5,140
06-04-2012, 08:32 PM
29. ### How have you dealt with missing values?

I'm currently conducting a large content analysis on company disclosures and have a lot of missing values. I've been looking at different ways to try...

• Replies: 0
• Views: 3,025
06-21-2010, 11:54 PM
30. ### How i can analyse two questionnaires to find the Reliability Coefficient

I am working on a project in which i am comparing Public and Private schools performance for that I have to compare the data on SPSS to find the...

• Replies: 0
• Views: 1,731
06-26-2016, 04:35 PM
31. ### How many people are needed for a valid sample?

Question I have to answer: In order to collect a survey of opinions, I would like to take a sample of a city with a population of 600,000 people....

• Replies: 0
• Views: 2,735
10-07-2011, 06:07 PM
32. ### How many random events to cover everything with 95% confidence?

Ok so I have what I believe to be a rather easy question, which I even feel I should be able to solve myself, but I can't... I hope someone can help...

• Replies: 4
• Views: 3,002
09-22-2010, 03:14 AM
33. ### How many subsamples from large sample should I draw?

Hi, I am working on an analysis where I compare 2 different samples, one Dutch and one US sample. The US sample is bigger than the Dutch sample...

• Replies: 3
• Views: 1,650
12-14-2012, 05:24 AM
34. ### How many tests?

Hi, I am trying to bridge a new reagent with an existing one so when the existing one runs out I can use the new one. I want to test the old and...

• Replies: 1
• Views: 1,125
08-06-2014, 09:10 AM
35. ### How robust is ANOVA's F-statistic?

Hello there! I have theoretical question about the robustness of the F-statistic used in ANOVA when used on data that is negatively skewed. Many...

• Replies: 3
• Views: 3,223
06-29-2012, 01:48 PM
36. ### How should I explain this results?

The hypothesis is: the willing-to-pay is higher when people see print ad with testimonial. So there are four print ads 1. 1 cola ad with...

• Replies: 4
• Views: 1,594
11-14-2015, 01:34 PM
37. ### How should I further analyse this result?

• Replies: 4
• Views: 2,067
12-04-2015, 04:05 AM
38. ### 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: 1,124
01-21-2016, 04:36 AM
39. ### How to prove the UMVUE under these conditions

Hi everyone, the question is Let \mathbb{U} be the set of all unbiased estimators of 0. Namely, \mathbb{U}={U(X):...

• Replies: 3
• Views: 3,252
04-06-2010, 12:00 PM
40. ### How to alculate cross loadings of each item in SPSS ?

Hello Can someone give me the way to do it in SPSS

• Replies: 0
• Views: 1,520
12-20-2014, 12:04 AM
41. ### How to alter the standard deviation of an empirical distribution?

For the purpose of a simulation I need to increase the standard deviation of an empirical distribution. I want to simulate what will happen if the...

• Replies: 4
• Views: 2,117
02-21-2015, 05:46 PM
42. ### How to analyse 5-point likert data with different questions under 1 subset?

I am working on a research assignment, and has received enough data for analysis In the project, I used health belief model (HBM) to investigate...

• Replies: 1
• Views: 2,267
10-01-2015, 08:23 AM
43. ### How to analyse a set of data without normality and homoscedasticity?

Hello, I'm a postgraduate student in Biology. From some time on, I wanted to publish a paper regarding the affectance of temperature to the shell...

• Replies: 0
• Views: 1,043
08-28-2015, 02:08 AM
44. ### how to analyse samples with different distribution?

I have sample 1 with normal distribution and sample 2 with not normal distribution. I want to compare the means of both the samples.Can I compare...

• Replies: 3
• Views: 1,767
06-20-2014, 07:33 PM
45. ### How to analyse scale data?

Hi all, For my dissertation I have done a likret scale questionnaire, 1-5 (1=strongly disagree, 2=mostly disagree....) about body image (10...

• Replies: 0
• Views: 1,419
03-19-2013, 09:16 AM
46. ### How to analyse this ranking survey ?

Hi all, I got a project from a newspaper company to find out the consumer preference of different middle income and high income group people that...

• Replies: 4
• Views: 2,574
05-22-2013, 10:53 AM
47. ### How to analyze a variable measured on a Likert scale and its interaction with another

0 down vote favorite I have to analyze this variable which consists of scores given to 3 items (1-9 scale). This "likert scale" measures "brand...

• Replies: 0
• Views: 1,032
06-17-2014, 07:30 AM
48. ### How to analyze change in performance

Greetings, I have a task that two groups of participants completed at Time 1 and Time 2. I was planning to conduct a repeated measures ANOVA,...

• Replies: 2
• Views: 897
04-28-2017, 12:11 PM
49. ### How to analyze different, complex data sets?

I'm looking for a good way to compare data sets. For 20 months, we collected larval fish using standard sampling gear (produces larval fish/cubic...

• Replies: 3
• Views: 9,215
01-25-2011, 04:13 AM
50. ### How to analyze my bat data...number of bats vs. distance categories..

Hello. I have some bat data that looks a bit like this: Distance from Unit Number of bats recorder 0-10metres ...

• Replies: 1
• Views: 1,919
07-07-2013, 02:54 PM
51. ### How to Analyze this data?

OK…so I am having difficulty trying to decide exactly how best to analyze the following data. Specifically, I am trying to determine the possible...

• Replies: 7
• Views: 3,164
10-05-2011, 11:38 AM
52. ### How to analyze two opposing sides survey results?

Hi! I am doing a research between two b2b sides that are cooperating. I have already made one survey and about to do the other. The point is to...

• Replies: 2
• Views: 3,328
12-12-2016, 12:15 PM

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