1. Announcement:
05-10-2017
Views:
1,895
Page 7 of 54 First 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 ... Last
Threads 361 to 420 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: 18,755
10-11-2014, 12:02 PM
1. ### GOF / Diagnostics for a GLM Binomial-Logit Family Model STATA

Hello, I am using a GLM Binomial-Logit Family Model. I am using this model because my dependent variable is a proportion. Having carried out the...

• Replies: 0
• Views: 4,179
05-20-2010, 03:59 AM
2. ### 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
3. ### 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
4. ### pearsons versus spearmans

Hi I have a very common but somehow still confusing question regarding correct correlation to use when addressing the relationship between two...

• Replies: 1
• Views: 2,643
05-23-2010, 10:28 AM
5. ### gee longitudinal

Hi there, I goin crazy with GEE and longitudianl data. I've studied the algorithm in many books and I am sure that I understand it and try to...

• Replies: 0
• Views: 2,043
05-23-2010, 05:01 PM
6. ### predictive analysis algorithm

Hi, What will be the best algorithms to use in case of predicting a large set of web data. mainly there will be 3 ,4 variables with which i want...

• Replies: 0
• Views: 2,505
05-25-2010, 07:57 AM
7. ### Market research questionnaire re-design

Hi, I have a questionnaire which contains 91 questions, I need to take away roughly 10-20 of them due to cost reason. I was thinking to use Factor...

• Replies: 3
• Views: 2,690
05-28-2010, 08:10 AM
8. ### 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: 6,102
05-30-2010, 09:49 PM
9. ### Sample

Consider we have a random sample (120 answers) and a convenience sample (80 answers) from the same population. Since the means of both samples are...

• Replies: 3
• Views: 2,503
05-31-2010, 08:03 AM
10. ### Probability Density Function needed

I am looking for a continuous probability density function defined in the interval with the following properties: 1. If the mode is 0.5 then...

• Replies: 1
• Views: 3,161
06-01-2010, 09:10 AM
11. ### sufficient statistic

Hi guys, I have a little question. I got a density function: f(x)=exp{-(x-\theta)} when \theta<X<infinity I need to find a sufficient...

• Replies: 1
• Views: 4,009
06-02-2010, 11:59 AM
12. ### Checking conditional and mutual independence

Hi, I am working on bayesian networks and i am encountering problem in calculation of conditional and mutual independence. My problem is I have...

• Replies: 0
• Views: 1,998
06-04-2010, 05:58 AM
13. ### Regression Model

wefwefwfweff

• Replies: 3
• Views: 3,919
06-04-2010, 09:04 AM
14. ### best way to use Cronbach's alpha?

I am making my first foray into survey based research. A quick question or two about Cronbach's alpha: My survey included questions about...

• Replies: 1
• Views: 6,728
06-07-2010, 03:55 PM
15. ### 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: 2,207
06-08-2010, 01:52 PM

f(x)=e^-(x-\theta) -(x-\theta) is the exponent x>\theta I need to find MLE for \theta I tried doing it with a graph, but I got strange...

• Replies: 4
• Views: 5,340
06-09-2010, 02:09 PM
17. ### Repeated measures ancova

Hi I am very stuck does anyone know how to run a repeated measures ancova in spss please!!!!

• Replies: 1
• Views: 4,687
06-09-2010, 05:19 PM
18. ### Mle

Hi guys, I need advice regarding this question: The height of students at university is a random variable from the N(\mu,25) distribution. A...

• Replies: 11
• Views: 3,299
06-10-2010, 01:17 PM
19. ### 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
20. ### Introduction for Observational Study on Red Cars

This is the Introduction for my stats project on red cars vs. speeding tickets received. Let me know what changes to make, and how the intro is....

• Replies: 0
• Views: 3,541
06-13-2010, 09:01 AM
21. ### 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
22. ### 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: 3,021
06-21-2010, 11:54 PM
23. ### Youden Index

Hello, I am doing some ROC analysis comparing grading scales for intracerebral hemorrhage. My question is - can the Youden Index be considered a...

• Replies: 0
• Views: 6,191
06-23-2010, 02:51 PM
24. ### Significant Difference with 2 vars

Hi everyone, Is it at all possible to determine if a group of points on a scatterplot are significantly different from another group of points? ...

• Replies: 7
• Views: 3,789
06-25-2010, 11:03 AM
25. ### rxc contingency table: comparison between cells?

Hello.I'm a dental student. I'm studying about how restorative methods are going to affect fracture pattern(fra.(fp)) of teeth. As a result I have a...

• Replies: 7
• Views: 5,742
06-26-2010, 04:52 AM
26. ### NLP Algorithm Evaluation: Help?

Hello guys, We're beginners here and please excuse us if our questions are inappropriate in any way. We have a statistics-related problem, and...

• Replies: 0
• Views: 2,916
06-28-2010, 03:01 PM
27. ### statistics calculator to adjust for design effect

Hi there, I'd like to know if anyone could tell me of a stats calculator that can adjust means and confidence intervals of analyses (paired-t and...

• Replies: 1
• Views: 4,993
07-01-2010, 02:41 PM
28. ### compute true values monte carlo simulation

Hello, I'm reading an article in which a monte carlo simulation is performed, but have the following problem: the data is generated as:...

• Replies: 16
• Views: 6,742
07-04-2010, 05:19 AM
29. ### 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
30. ### How to predict prevalence rate based on demographic factors?

Some background: I've been teaching myself some math and statistics - started developing software as a kid and went right into the field after...

• Replies: 4
• Views: 4,212
07-06-2010, 09:40 PM
31. ### Latin Hypercube sampling with correlations

Hello! I am trying to generate a 9-dimensional Latin Hypercube sample (1000 draws or so) where each dimension variable is normally distributed...

• Replies: 0
• Views: 3,253
07-07-2010, 02:57 AM
32. ### Log likelihood function for P-EGARCH(1,1)-t needed

Hi guys, I am currently writing my MSc. Finance thesis on calendar effects, using a Periodic Exponential GARCH(1,1) model with student-t error...

• Replies: 0
• Views: 4,124
07-11-2010, 11:30 PM
33. ### Ranking advertisers based on performance

Hi, let's say you run an ad network and you want to rank your advertisers based on their performance. Now what most networks do is simply...

• Replies: 3
• Views: 2,904
07-13-2010, 02:23 PM
34. ### Intraclass correlation coefficients for linear mixed models

I've been looking around for a while and have yet to find and answer to satisfy my appetite. Hopefully, one of the members here will be able to help....

• Replies: 0
• Views: 3,975
07-13-2010, 02:51 PM
35. ### Extreme events...

Hi. Is {w:P(w) is very small} acceptable to translate the meaning of extreme events given in the following sentence: An extreme event is defined as...

• Replies: 6
• Views: 4,639
07-14-2010, 07:47 PM
36. ### multiple groups & dichotomous responses

I have a set of data from a number of countries where interviewees have answered simple yes/no questions. The "DV" is, in other words, 1 or 0, and...

• Replies: 8
• Views: 5,335
07-16-2010, 10:29 AM
37. ### variables that are not independent of each other

What are some ways this dependency is modeled with statistical methods?

• Replies: 5
• Views: 3,890
07-16-2010, 05:03 PM
38. ### Multicointegration - alternative variable?

Time series: For example, if a dependent variable only have 17 observations could I replace it with something with more data if I want a rough...

• Replies: 0
• Views: 6,960
07-19-2010, 07:31 PM
39. ### 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
40. ### t test using diversity index

So, I am trying to perform a t-test using diversity indexes, but the biostat book I am using is a little bit confusing. the calculated t value =...

• Replies: 0
• Views: 3,409
07-23-2010, 08:49 PM
41. ### Question about Stationary R^2 and Ljung-Box Statistics in ARIMA Models...

On the results of my ARIMA models in SPSS, I am getting Ljung-Box statistics that are statistically significant (P < 0.05) but also horrible R^2...

• Replies: 0
• Views: 4,286
07-25-2010, 07:44 PM
42. ### What is the accepted Confidence Interval for a Business research..

Hi all, I need to know the accepted Confidence Level (e.g. whether it is 95% or 99%) and the accepted "Confidence Interval" (e.g. if it is 10 or...

• Replies: 4
• Views: 8,929
07-31-2010, 11:15 AM
43. ### levy process, subordinator

• Replies: 0
• Views: 4,054
08-02-2010, 12:53 PM
44. ### "significance metrics" for hypothesis testing

------------

• Replies: 0
• Views: 2,626
p05
08-02-2010, 04:58 PM
45. ### Problems with ANOVA Assumptions and I don't think Kruska Wallis will help

I am conducting an experiment with four independent variables each of which has three or more factor levels. The sample size is quite large i.e....

• Replies: 1
• Views: 5,479
08-03-2010, 01:01 PM
46. ### Sampling question

I have to estimate 2 parameters from a health claims database: the total dollars paid correctly and the proportion of claims adjudicated correctly. ...

• Replies: 0
• Views: 2,025
08-05-2010, 10:55 AM
47. ### How to describe data that trends to a horizontal aymptote?

Hi all, I'm designing a within-subject experiment with one independent variable X, where we are expecting the dependent variable to increase...

• Replies: 0
• Views: 3,010
08-05-2010, 01:13 PM
48. ### difference between mean ranks

Hello! I asked respondents to rank 13 motivation factors in order of importance (from the most important to the least important). Now, I would...

• Replies: 1
• Views: 5,624
08-06-2010, 08:25 AM
49. ### Does anyone know what associated means??

I have a stochastic process. Think of it as an assembly line. For the ith item that enters the process it produces a total work time of Y(ti). A...

• Replies: 1
• Views: 3,022
08-06-2010, 10:55 AM
50. ### post-hocs for repeated measures ancova

hi there, i am running a 2x2x3 repeated measures anova with a covariate i have an interaction between two within-subjects variables, and...

• Replies: 0
• Views: 4,182
08-10-2010, 07:59 AM
51. ### paired anova for lack of a better word advice please

Dear All i am stuck at the moment between a rock and a hard place. the short of the story is this. I have 84 petri dishes each containing 4 lines...

• Replies: 15
• Views: 7,174
08-14-2010, 08:41 AM
52. ### A Non parametric equivelent to mixed anova?

Hello, I am trying to find a non-parametric equivalent to a mixed Anova? My data is horrible. Three small unequal groups (8, 8, 4) and data...

• Replies: 1
• Views: 5,117
08-14-2010, 09:36 AM
53. ### muscle strength gain vs. time vs. age

Anyone have data from longitudinal studies on this? 1% per week seems like a reasonable initial value. Thanks.

• Replies: 0
• Views: 3,419
08-15-2010, 04:24 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: 7,673
08-16-2010, 11:59 AM
55. ### 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
56. ### 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
57. ### minimum data points for the K-s test for normality

Dear all I have 6 points of data that i need to test for normality. is this enough to use the K-s test? what is the advised minimum for this test?...

• Replies: 0
• Views: 4,577
08-18-2010, 04:45 PM

Page 7 of 54 First 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 ... Last

Use this control to limit the display of threads to those newer than the specified time frame.

Allows you to choose the data by which the thread list will be sorted.

Note: when sorting by date, 'descending order' will show the newest results first.