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Threads 961 to 1020 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: 18,756
10-11-2014, 12:02 PM
1. ### Gpower

I'm wanting to run a study where I record motor evoked potentials evoked from a group of participants they view images of people performing reach and...

• Replies: 2
• Views: 5,118
01-11-2011, 08:28 AM
2. ### 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: 2,350
01-01-2010, 09:35 PM
3. ### 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: 3,047
11-17-2009, 01:06 AM
4. ### Percent Change

What should I put for the % change if the beginning value is 0 and the final value is >0, other than "not applicable"?

• Replies: 2
• Views: 4,477
03-16-2010, 01:38 AM
5. ### Choosing a model for categorical data

Hi all, I'm not very familiar with working with categorical data. I would like to model a categorical response variable (nominal, three levels) as a...

• Replies: 2
• Views: 2,646
03-17-2010, 03:59 PM
6. ### Generating correlated binary data

Suppose I have a column of random binary numbers. I would like to find a way to generate a second column with the same number of cases that has a...

• Replies: 2
• Views: 3,422
03-19-2010, 06:31 PM

:eek: Please any kind person help, as I am horribly stuck!!! I have a *very* large dataset (n>300,000 rows) of water readings in this format; ...

• Replies: 2
• Views: 2,224
03-23-2010, 10:43 PM
8. ### Research for Student help please

Hello all, I have to do a research report for part on my access course before degree in Sep. I have decided to study the effects of poverty...

• Replies: 2
• Views: 2,890
04-09-2010, 09:40 AM
9. ### Multinomial Logistic Regression

Does anyone knows how I can formulate a the link function of a multinomial logistic regression without using a base class teotjunk

• Replies: 2
• Views: 3,633
05-07-2010, 05:57 PM
10. ### Adding Random Variables from Logistic Distributions

Given two logistic distributed random variable: ( mu_1, s_1 ) and ( mu_2, s_2 ) what is the sum of the variable? I tried monte carlo on (...

• Replies: 2
• Views: 8,213
05-13-2010, 04:36 PM
11. ### [Help] What is the statistical formula applied in this problem?

Stat/Math wizs, if you could kindly shine your beacon on this problem. I'm running some statistics using a clustering algorithm and it classified...

• Replies: 2
• Views: 2,177
05-14-2010, 11:15 PM
12. ### Model Suggestions?

Hello Stat experts - I'm hoping to find some inspiration in a project I'm doing. I have some longitudinal data, 15 series of measurements ...

• Replies: 2
• Views: 2,502
05-20-2010, 08:07 AM
13. ### How to calculate variance on pooled data

I have an array of pairs. Each pair represents a "bin" in a range. Each pair stores a sum and a count. Data is added to a pair/bin by adding the...

• Replies: 2
• Views: 6,103
05-30-2010, 09:49 PM
14. ### Grouping distributions together based on significance

Hi, all: My PhD research has wandered into an area that requires more statistical analysis than I am currently comfortable with, and so I'm...

• Replies: 2
• Views: 2,100
05-21-2010, 12:46 PM
15. ### try this for kicks...

Hi everyone! First post for me. I think this might be a bit tricky, but i would really appreciate some help (go figure..). I recently got...

• Replies: 2
• Views: 2,006
06-12-2010, 03:04 AM
16. ### P-value Formula for Z-test Statistic

Hello All, I am trying to find the formula for p-value for a z-test. Ultimately, I would like to code this in PHP, but first need to start by...

• Replies: 2
• Views: 14,990
06-17-2010, 05:13 PM
17. ### Need Help in identifying problem

Hello all, Imagine you have two time series X1,X2,...Xt - represents incoming volume to the yard, and Y1,Y2,...,Yt - outgoing volume from the...

• Replies: 2
• Views: 2,993
07-06-2010, 08:36 PM
18. ### Sample size calculation formulae

Sample size calculation formulae Can someone please let me know where I can find a suitable 'Sample Size calculation Formula'? A standard...

• Replies: 2
• Views: 3,721
08-21-2010, 11:38 AM
19. ### How to correct negative skew

My dependent variable is negatively skewed with 5 outliers. How do you correct a negative skew? Thanx.

• Replies: 2
• Views: 8,152
07-23-2010, 05:03 PM
20. ### error on percentile estimation

Hi all, I have a problem that I need help on please. I have some 1000 samples from an unknown distribution, from which I wish to derive various...

• Replies: 2
• Views: 6,551
08-17-2010, 06:01 AM
21. ### 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: 3,090
08-17-2010, 01:08 PM
22. ### Negative binomial regression / poisson regression

Does anyone have experience with STATA? and more specifically how to conduct a negative binomial regression in stata? My problem is that i dont...

• Replies: 2
• Views: 8,840
08-28-2010, 04:24 AM
23. ### Comparison of time series

Hi there, firstly I would like to say that I'm newbie here, so hi everyone, and please be patient if I do something wrong. And sorry for my level...

• Replies: 2
• Views: 9,363
09-17-2010, 11:58 AM
24. ### Numeric algorithm to compute probability for Beta Binomial

Dear all, I am trying to find a numeric method that can be handled at least by Excel to compute the probabilities of Beta Binomial distribution....

• Replies: 2
• Views: 6,670
09-26-2010, 03:48 PM
25. ### My professor told me that a t-test wasn't the correct procedure to use in a report

In my report it states: "the incidence of vomiting after treatment showed a 9% decrease in the control group, which was not significantly...

• Replies: 2
• Views: 2,692
10-02-2010, 01:34 PM
26. ### Is it correct to use Pearson correlation for variables measured on a "Likert scale"?

Hi All, I'm conducting a research testing the relationship of 2 variables which are measured on agreement scales. Is it correct to use Pearson...

• Replies: 2
• Views: 14,792
10-04-2010, 06:41 PM
27. ### Normal Extreme Values

Mostly I have been answering questions, but today I am asking one: what is the distribution of the maximum of n draws from a normal distribution? ...

• Replies: 2
• Views: 2,849
10-17-2010, 11:19 PM
28. ### IQR and Standard Deviation

Hello everyone, I'm trying to determine if there is a relationship that exists between IQR and Standard Deviation in all distributions, not just...

• Replies: 2
• Views: 3,553
10-20-2010, 04:28 PM
29. ### Help with choice of nonparametric?

Hello, I have a very small sample, n=6 for an exploratory pilot study. I want to correlate the variables i have to see if there are any...

• Replies: 2
• Views: 2,518
11-07-2010, 02:57 AM
30. ### Can you combine survey responses for a Confidence Interval

Hi, I'm doing basic analysis on a national survey but would like to combine responses to a question and was wondering if I can report a confidence...

• Replies: 2
• Views: 2,550
11-10-2010, 11:04 AM
31. ### Need help with large data set. Nested/factorial??

I'm working with my field data and trying to understand the best way to analyze it. I have: 6 Sites 2 tide-pools per site Each pool has at...

• Replies: 2
• Views: 2,575
11-08-2010, 07:51 PM
32. ### ranking and meta-analysis

Hi everybody, I have a problem regarding some statistical evaluations. I want to conduct a meta-analysis of several papers. The goal of the...

• Replies: 2
• Views: 5,736
11-11-2010, 03:02 AM
33. ### Paired Data

Hi All, I have some paired data (pre and post test on the same subjects) I did a paired t-test to test the means. Now I want to look at...

• Replies: 2
• Views: 2,794
11-14-2010, 08:58 PM
34. ### Op notation

Hey Guys. It is my first time here. Glad to meet you all. I've got a question on Op notation. In my research, I've got an assumption associated...

• Replies: 2
• Views: 2,901
12-04-2010, 05:18 PM
35. ### Determining Clustering in Time Series Data

Dear all, Let me begin by apologising if my question is obvious or rudimentary, I have a very basic knowledge of statistics. I have some time...

• Replies: 2
• Views: 4,112
11-20-2010, 07:14 PM
36. ### Fitting Archimedean copula

hello, I am attempting to fit an archimedean copula in R, clayton specifically. I attempt to use the fit.AC function. I get the following...

• Replies: 2
• Views: 5,185
12-23-2010, 08:31 PM
37. ### how to calculate Factor Scores?

Hello folks, I need to know how to calculate factor score in Principal Component Analysis. I know in SPSS, it gives option of calculating it using...

• Replies: 2
• Views: 11,790
11-23-2010, 12:28 PM
38. ### 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: 7,147
12-04-2010, 04:43 AM
39. ### resampling CI

Hi there, I have a question regarding the bootstrap. Suppose you want to run a simulation about estimating an unknown parameter θ. Suppose...

• Replies: 2
• Views: 3,296
11-28-2010, 03:00 PM
40. ### HLM vs. Fixed Factor vs. Dummy Variables -- What to choose?

Hi all, I am trying to analyze data from a survey that I ran, which includes individual residents within 4 neighborhoods. I want to be able to...

• Replies: 2
• Views: 4,160
12-08-2010, 11:57 AM
41. ### Is online survey random? How to make it random?

Hi there, I want to conduct an online survey. I know that by default only some users would be included. How to increase randomness? Thank you.

• Replies: 2
• Views: 4,790
12-25-2010, 06:14 AM
42. ### Grou x Time interactions

Hi, I conducted in my clinical trial a mixed anova with repeated measures. What can I conclude if I find significant interactions Group x Time and...

• Replies: 2
• Views: 11,848
01-10-2011, 05:26 AM
43. ### Football (Soccer) Betting Model Inference

British Football (Soccer) Betting Model Inference Hi,Guys! I am not a statistician, so please forgive me if I miss some points (which I surely...

• Replies: 2
• Views: 5,179
01-06-2011, 01:12 PM
44. ### Which Anova to use???

Okay. So I've read tons of books on this and none of them seem to give me a clear answer so here goes. I have 40 subjects. Each will be randomly...

• Replies: 2
• Views: 4,571
01-31-2011, 03:01 AM
45. ### Ranked data

I asked my participants to rank 5 items as 1=least severe to 5 =most severe, now how can I analyse these data, parametric or non-parametric tests,...

• Replies: 2
• Views: 3,366
01-16-2011, 02:10 PM
46. ### interaction

I have found a model to be significant for the effect of 4 IVs (two continuous and two dichotomous) on a continuous DV but none of the IVs show...

• Replies: 2
• Views: 2,891
02-07-2011, 10:17 PM
47. ### Mann-Whitney U Test for non random sample

Hi I've got too groups Success and Failure I've got four sample populations in different industries that i've ranked by a measure of success. ...

• Replies: 2
• Views: 3,415
01-20-2011, 03:31 AM
48. ### What is the proper way to divide a skewed dataset into high, medium, and low interval

I don't know if this is the proper forum for this. Hello, I have a skewed dataset, and I am dividing it into high, medium and low values. I don't...

• Replies: 2
• Views: 6,847
01-24-2011, 11:37 AM
49. ### linear mixed model in SPSS - how?

Hi guys, Imagine a nonrandomized trial with 2 groups (control and treatment) and two time points (pre and post). An ANOVA of change seems superior...

• Replies: 2
• Views: 18,825
02-25-2011, 02:56 PM
50. ### Sum of the residuals

Hi, My question may sound trivial but here it goes: When doing a sample regression by the ordinary least squares method, does the sum (nonsquared!...

• Replies: 2
• Views: 50,694
02-04-2011, 01:40 PM
51. ### Likelihood Ratio Test for general hypotheses

Hi, The original paper (Wilks, 1938) describing the Likelihood Ratio Test considers a null hypothesis stating that a subset of the parameters from...

• Replies: 2
• Views: 5,946
02-17-2011, 07:54 AM
52. ### MLE for given mean

The observed value of mean of a random sample from N(\theta,1) distribution is 2.3. If the parameter space is \Theta=\{0,1,2,3\}, what is the MLE of...

• Replies: 2
• Views: 2,227
02-21-2011, 10:59 AM
53. ### Fisher LDA

Hi, How do I incorporate knowledge of prior class probabilities p_i into Fisher LDA? I think Fisher LDA assumes p_i = 1/c always, with c=# of...

• Replies: 2
• Views: 4,154
02-22-2011, 11:39 AM
54. ### Best Approach

Hi, I am looking to analyse a data set consisting of one dependent variable - respondent satisfaction values ranging from 1 to 10 - with three...

• Replies: 2
• Views: 2,449
02-23-2011, 11:38 AM
55. ### Correlation or Difference?

hello everybody, i have a question about which method would be more appropriate. I have a 4 point ordinal dependent variable. I also have 3...

• Replies: 2
• Views: 5,630
02-26-2011, 11:41 AM
56. ### Significance testing for proportions (NPS)

I have 2009 and 2010 NPS (Net Promoter Score) survey results. Now I want to test if the change in 2010 NPS from 2009 is statistically significant or...

• Replies: 2
• Views: 7,755
03-07-2011, 05:17 AM
57. ### Common method variance

Hi, I am analysing a self reporting survey. From the survey is designed to look at 12 constructs. Each of these constructs have either 1,2,3...

• Replies: 2
• Views: 3,830
03-03-2011, 08:52 PM

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