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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: 19,375
10-11-2014, 12:02 PM
1. ### 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: 904
06-21-2016, 04:40 PM
2. ### Which method? Categorical data (IV) and continuous numerical data (DV)

Thanks in advance for taking a look at my query I have been trying to get some statistical support from my local research department but I am...

• Replies: 0
• Views: 1,725
06-21-2016, 06:17 AM
3. ### Percent From The Critical Value

Afternoon, Here is one I haven't experienced before and haven't seen discussed: I have a series of goodness-of-fit tests using chi-square a few...

• Replies: 0
• Views: 1,172
06-20-2016, 01:46 PM
4. ### Genes comparison in SPSS

Hey guys, I have an excel sheet I imported to SPSS all the rows are genes (over 3200), and for each gene I have its expression level in 6...

• Replies: 1
• Views: 1,386
06-19-2016, 03:38 AM
5. ### Population Estimation

Hello, new member here and I've been looking for a way to make a number cruncher for a (imaginary) colony of creatures for an RP I'm making. I'm...

• Replies: 6
• Views: 2,506
06-16-2016, 08:05 AM
6. ### Welch ANOVA and covariates

I had planned, because of lack of homogeneity of variance for some of my variables (homoscedasticity) to run a Welch's ANOVA and to use...

• Replies: 0
• Views: 2,552
06-15-2016, 01:34 PM
7. ### large cell counts - Fisher's Exact vs. chi2

Hi everyone, I read a while back that chi2 was most accurate for observed cell counts of only between 5-70, but now I can't find that reference. I'm...

• Replies: 2
• Views: 1,049
06-14-2016, 04:27 AM
8. ### Estimation of suitable significance level for high numbers of experiments

I am a scientist and work with high numbers of experiments. For example: I have tested 1000 different parameters between 2 groups. I found 10...

• Replies: 0
• Views: 1,110
06-13-2016, 11:37 AM
9. ### ttest for comparison of group means from pooled samples

Hello, I have results from an experiment where a number (n=50) of biological samples were pooled together with a single measurement of chemical...

• Replies: 0
• Views: 833
06-09-2016, 09:38 AM
10. ### Which Non-parametric Significance Test Should I Use?

Hi, I've been working on a little project. Last year I delivered pizzas. I recorded data for 300 of my deliveries like tip amounts, order totals,...

• Replies: 5
• Views: 2,238
06-09-2016, 02:34 AM
11. ### Compound poisson gamma model and biomass data

I have some biomass data (total count -discrete- of individuals and total dry weight -continuous-) that I would like to model with environmental...

• Replies: 1
• Views: 1,628
06-07-2016, 01:12 PM
12. ### Census data: Should I worry about sample size and pvalues?

Hi all, I have a questions regarding statistical power and sample size. (1) Do I have to worry about sample size in a multiple logistic regression...

• Replies: 6
• Views: 1,750
06-07-2016, 08:22 AM
13. ### Considering Skewness and Kurtosis

Hello All, With test data the parameters were created for mean, standard deviation and the two other moments. I then take look at samples one at...

• Replies: 0
• Views: 1,787
06-05-2016, 12:40 AM
14. ### Generating Skewed Normal Distributions

I want to generate Random Normal Distributions with specific degrees of Skewness and Kurtosis. So far I have looked at the following two approaches:...

• Replies: 17
• Views: 43,730
06-03-2016, 10:10 PM
15. ### a completely randomized experimental design and regression

A company studied the effects of three different methods of promotions on sales of its crackers (labeled as Treatment 1 to 3). Fifteen stores were...

• Replies: 1
• Views: 1,914
06-02-2016, 02:38 PM
16. ### Need help with Power Analysis

Hello, i am performing Welch's Anova as my data lack homegeneity, and post hoc testing with Games Howell. My problem is that i cannot find power for...

• Replies: 1
• Views: 1,198
05-31-2016, 04:22 AM
17. ### Need help with power analysis GPower Novice

Hello everyone. I am doing a power test for Fishers Exact Test on GPower, and dont know how to determine the proportions p1 and p2. I have 2...

• Replies: 0
• Views: 999
05-26-2016, 01:32 PM
18. ### Necessary condition analysis

Hi, I have a research problem where I have to identify a necessary condition. I have three data series, X, Y, Z. say, Z is the dependent variable and...

• Replies: 1
• Views: 2,129
05-25-2016, 02:48 PM
19. ### Suggest me a test

im doing a thesis titled 'Impact of banning smartphone on employee engagement on next generation employees' h0: banning smartphone has no such...

• Replies: 0
• Views: 521
05-25-2016, 11:27 AM
20. ### help needed with Fishers Exact Test (power calculation)

Hello everyone. Hope someone can help me. I am running a Fisher exact 4 X 2 table analysis in SPSS. I have been informed its the correct test to...

• Replies: 0
• Views: 762
05-25-2016, 03:49 AM
21. ### Appropriate test for quantitative content analysis of one newspaper

Hi everyone, I am examining the differences in media coverage of homicide on the basis of the religion of the victim (bias). The sample is one...

• Replies: 4
• Views: 1,478
05-22-2016, 07:15 AM
22. ### Chi-square instead of Multiple Regression Analysis

Can someone help me? How can I explain that I used Chi-square test of association instead of Multiple Linear Regression Analysis because I had...

• Replies: 0
• Views: 912
05-21-2016, 11:45 AM
23. ### How to apply syntax to specific data?

Hi there - I need to convert some raw data into categories via a calculation which turns the raw data into angles (to establish specific groups). I...

• Replies: 0
• Views: 963
05-17-2016, 09:50 AM
24. ### Suggest a research design.

I am currently doing research assignment which is to design a program evaluation and need to seek advise on some research questions. As a person...

• Replies: 0
• Views: 556
05-17-2016, 08:54 AM
25. ### Standard error of measurement (SEM) consistency - what's the formula?

Hello, everyone How to calculate the standard error of measurement (SEM) but for consistency? I would like to find the formula and the paper which...

• Replies: 0
• Views: 783
05-13-2016, 11:47 AM
26. ### [SPSS - Hypothesis testing] Controlling for a variable. ANCOVA?

Hi! I am using open data from New York City's yellow cabs and the in 2013 introduced citibikes (bikesharing service) to see if the introduction of...

• Replies: 0
• Views: 676
05-12-2016, 03:18 PM
27. ### Pre and Post with Treatment group - ANOVA , ANCOVA, Regress differences???

Hello friends, My main task is to "test" if staff member who participated in the counseling sessions had fewer "Use of Force (UOF)" incidents in...

• Replies: 4
• Views: 1,987
05-12-2016, 10:00 AM
28. ### How to perform reverse score transformations? (non-normal data)

Hello, Sadly, my data are significantly non-normal, negatively and not positively skewed, so that leaves me, according to some statisticians, with...

• Replies: 1
• Views: 1,215
05-12-2016, 06:13 AM
29. ### Evaluation of Bayesian Model

How can I evaluate if a created bayesian model is reliable model that makes good predication? To conclude if the created bayesian model produces a...

• Replies: 1
• Views: 1,173
05-11-2016, 02:03 AM
30. ### Problem in Structural Breaks

Suppose, if I draw samples of different sizes at time t=1,2,..,T,T+1,..,2T where the sample sizes could be different and the observed variable is a...

• Replies: 0
• Views: 1,157
05-10-2016, 12:17 AM
31. ### Difference between expected spending and observed spending. What kind of statistical

I would like some advice from you about what kind of statistical analysis I could do about that data. My case is as follows: According to a...

• Replies: 0
• Views: 2,308
05-04-2016, 12:02 AM
32. ### Randomised Complete Block Design (RCBD)

During the cotton-spinning process, a strand of cotton thicker than the final thread is produced, and then twisted before it is wound onto a bobbin....

• Replies: 0
• Views: 1,211
05-03-2016, 01:36 PM
33. ### Threshold Autoregressive (TAR) Model with exogenous variables (TARX)

Anyone have experience with these models? From what I remember about VAR is that adding exogenous variables to model a VARX is straightforward....

• Replies: 0
• Views: 831
05-02-2016, 07:42 PM
34. ### Average height of population

I am trying to figure out how many samples to take from known population to be accurate within 95%. For example to find average height and...

• Replies: 0
• Views: 833
04-28-2016, 08:56 PM
35. ### chi square test to test difference for 5x2

My data has two groups people, VV and NV, and I want to test the difference in their occupation. The occupation were 5 groups: farm/fh, farmer/fh,...

• Replies: 1
• Views: 1,614
04-27-2016, 07:47 PM
36. ### Need help for an analysis

Hi I'm working in a textile company that have stores in many countries.While planning quantities of product,we are considering of product display...

• Replies: 0
• Views: 1,346
04-27-2016, 02:26 PM
37. ### Staff performance comparison between staff and overall metric

"Age Group" "Members in 2015" "Complaints in (2015)" "Staff 1 Members in 2016" "Staff 1 Complaints in 2016" "Staff 2 Members in 2016" "Staff 2...

• Replies: 0
• Views: 1,628
04-22-2016, 11:25 AM
38. ### Standard deviation

I have a population of 229, the mean is 20.8 and the standard deviation is 24.6. What can be concluded from this? Is this significant?

• Replies: 0
• Views: 1,284
04-19-2016, 05:21 PM
39. ### How to apply Chi Squared test according to this Simulation?

Hi there, I have been wondering about some points of Chi squared test. I would like to introduce the following scenario to better clarify my...

• Replies: 0
• Views: 952
04-19-2016, 04:24 PM
40. ### Need a methodology to predict car sales from various showrooms in a district

Data Assumptions: The sales on a particular day is always 60 There are 3 showrooms in the district There are other factors too(I have omitted the...

• Replies: 0
• Views: 1,090
04-19-2016, 04:44 AM
41. ### Policy chance analysis - time series count data

Hi, I need some help to determine my approach. For a school project I would like to examine the effect of a policy change in the Danish...

• Replies: 0
• Views: 979
04-18-2016, 07:01 AM
42. ### What statistical test should I use to test for statistical significance?

Hello fellow members, I haven't been using statistics for a long time and I have trouble recalling statistical tests and their use. I hope you can...

• Replies: 1
• Views: 1,522
04-18-2016, 01:48 AM
43. ### 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: 915
04-17-2016, 04:46 AM
44. ### Time Series - Difference over time

Hello, I'm new in the time series, so I need some help. I have a short time series (5 quarters), with the proportion of a parameter (public...

• Replies: 3
• Views: 2,257
04-15-2016, 02:15 AM
45. ### 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: 2,640
04-13-2016, 04:04 PM
46. ### Should I use a Weighted Average? HELP!

Hi All - first post here and advanced warning I'm no stats wiz, but need the kind help of y'all. I have a huge dataset I am working with and trying...

• Replies: 2
• Views: 1,707
04-13-2016, 03:49 PM
47. ### standardize by population density

I have a variable called "number of events" for each state. It is a raw number of event that happened during a specific time frame. I was thinking I...

• Replies: 0
• Views: 626
04-11-2016, 09:57 AM
48. ### Question on the merits of mediation analysis Vs another analysis (described within)

Hello, I have a dataset involving an intervention (placebo versus real) - denoted as X, an outcome (Y), and a physiological variable (M) that I...

• Replies: 0
• Views: 1,423
04-05-2016, 07:40 AM
49. ### Estimating location of lower tail

Say I have a sample, assumed from a Normal Distribution. I want to find a confidence interval for this parameter: L = \mu - \alpha * \sigma ...

• Replies: 2
• Views: 1,713
03-31-2016, 11:58 AM
50. ### Clinical Trial - sample size for statistically comparable data?

Hi Everyone In a nutshell - I am looking to undertake an 8 week clinical trial of an equine veterinary health product. I am wanting to analyse...

• Replies: 1
• Views: 854
03-29-2016, 08:03 AM
51. ### Non-Inferiority Test in Multple Logistic Model

Does any body have any insight or experience running a non-inferiority test based on multiple linear or logistic regression. So perhaps mean and risk...

• Replies: 1
• Views: 1,314
03-28-2016, 01:22 PM
52. ### Do i use an ANCOVA for a cross over of exams, pre/post study?

I have a study i am running and would like to know the appropriate test to apply, its complicated but bear with me :) Background: We are looking...

• Replies: 0
• Views: 2,999
03-24-2016, 12:35 PM
53. ### Confidence Intervals in a research paper

Hi, all. I'm writing a paper on concussion data from the NFL Surveillance System, and I want to be able to put the data analysis from the journal...

• Replies: 3
• Views: 3,673
03-24-2016, 07:42 AM
54. ### The null hypothesis

Hi everybody, I would like to hear from you your suggestions, I would be grateful to your help and thank you in advance for your help. I am a...

• Replies: 2
• Views: 2,056
03-22-2016, 11:40 AM
55. ### Principal component analysis (PCA) on clustered data

Hi Everyone, I am analysing data about physical condition tests on students belonging to different type of schools (general, professional,...

• Replies: 3
• Views: 1,739
03-21-2016, 03:18 AM

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