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# Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

1. ### Sticky: We only provide homework help to those who show effort

Welcome to Talk Stats Forum. In order to keep homework help effective and efficient, we request all members to abide by these guidelines: 1)...

• Replies: 0
• Views: 66,862
09-30-2005, 09:44 AM
2. ### Sticky: Forum Guidelines: Smart posting behavior pays off

Welcome to talkstats.com, the place for statistics help. This is a guideline for people who want to ask a question on this forum and value a...

• Replies: 1
• Views: 196,968
07-16-2014, 11:01 AM
1. ### Data transformations - at my wits end!

I've been transforming my participant MEANS per level of the independent variable... but I'm getting nowhere. There's still a "ceiling effect" in my...

• Replies: 0
• Views: 3,212
03-02-2008, 04:38 PM
2. ### Correlation confusion

I have 2 continuous variables which don't significantly correlate. If I break one of the continuous variables down into a median split and run an...

• Replies: 4
• Views: 2,623
03-19-2008, 02:01 PM
3. ### Help needed quite urgently!

Hi all. My study originally set out to measure one thing as an individual differences variable (so basically correlation/regression) and a few...

• Replies: 0
• Views: 2,804
03-27-2008, 08:47 AM
4. ### Reconstructing datasets

is it possible to reconstruct datasets from a mean and standard deviation in someone's report? thanks!

• Replies: 4
• Views: 2,803
05-18-2008, 06:57 AM
5. ### help with streamflow data

I have a several-step problem here and not sure how to go about it. Any advice would be appreciated. I have streamflow data (daily average...

• Replies: 0
• Views: 2,015
12-14-2006, 04:16 PM
6. ### regression on censored data

Hi everyone. I am trying to do statistical analysis on censored data. I have paired data: for each stream flow measurement I have a bacteria count...

• Replies: 2
• Views: 2,687
03-11-2009, 05:50 PM
7. ### RPD Acceptance

I am analyzing duplicate water quality sample data (2 samples collected in the same place at the same using the same procedures). I was told to use...

• Replies: 1
• Views: 7,485
10-02-2009, 10:58 AM
8. ### How to get rid of autocorrelation for VAR model that requires high lags

Hello, I am trying to develop a model yield to forecast yield curve 6 months in the future, loosely based Diebold Li term structure model. I am...

• Replies: 2
• Views: 3,134
12-19-2016, 11:48 AM
9. ### Decision Rule

I am having a hard time on how to distinguish if a reject or fail to reject the Null Hypothesis I do not understand what it means i.e. i have Null =...

• Replies: 0
• Views: 1,963
10-30-2011, 05:17 PM
10. ### variance and covariance need to clarify!

Hi, There is an example in an article where the author calculates variance and covariance, but I can't understand how (I'm novice in the topic). The...

• Replies: 2
• Views: 2,814
01-11-2009, 01:12 PM
11. ### How do I prove asymmetry of random counters?

I am doing computer simulation of a certain random process. During the simultaion I have eight counters arranged symmetrically on a circle. I suspect...

• Replies: 0
• Views: 938
Ark
01-03-2014, 02:15 PM
12. ### Hypothesis Testing - t test or ANOVA?

Hi guys, I am doing a piece of work with an existing dataset and was looking for some advice. I have a group of subjects and controls and some...

• Replies: 3
• Views: 1,813
11-20-2015, 07:36 AM
13. ### how to calculate prevalance of obesity in spss using bmi values

i am a newbie and i dont know how to calculate prevalance of obesity in spss using bmi values

• Replies: 16
• Views: 21,814
09-09-2012, 11:35 AM
14. ### GRE question re its standard deviation

Hi guys, So if I understand correctly, GRE has the average 500 and SD of 100. So 68% of scores fall between 400-600, and 95%, 300-700, and over...

• Replies: 2
• Views: 3,736
08-28-2011, 11:49 PM
15. ### Find statistically significant variables and also where to split their range.

Hi, I want to find a way to split a dataset so that I can see not only the importance of each attribute on the label but also at what point it needs...

• Replies: 0
• Views: 998
07-06-2015, 01:34 PM
16. ### stats

• Replies: 2
• Views: 1,264
09-07-2014, 09:34 PM
17. ### Help me please ... How to calculate the next element

Hello, My boss has just asked me to come up with a formula which allows me to calculate the dow jones odds. I have all the dow jones values since...

• Replies: 7
• Views: 4,177
08-11-2009, 08:29 AM
18. ### Two ranked ord. variables controlled by scale variable

My aim is to study correlation between two ordinal ranked variables (Var1 and Var2) valued 0-3. In order to investigate the correlation between them...

• Replies: 0
• Views: 1,046
02-14-2014, 09:23 AM
19. ### Impact of one-time events on time-series variables

Hello, I wonder how to evaluate the impact of one-time events on time-series variables. For example: A company is selling precious metals...

• Replies: 2
• Views: 6,525
02-28-2011, 09:16 AM
20. ### Wilk's theorem and regularity condition

EDIT: in the following " 1 + a "should be read as 1 plus a. For some reason the "plus" is not diplay on my screen. (Mod Note: I fixed that for...

• Replies: 0
• Views: 2,540
03-19-2012, 11:29 AM
21. ### Standard Error--Question

I've been given a dataset that contains an estimated value of survival (Kaplan-Meier with staggered entry) by calendar dates and the associated...

• Replies: 0
• Views: 1,215
08-06-2014, 06:08 AM
22. ### Help with crosstabs (or maybe another analysis?)

Hi. I've got a data file with 2 nominal variables, one with 3 levels (age groups) and the other with 5 levels. I've used crosstabs in SPSS to get a...

• Replies: 0
• Views: 3,330
10-22-2008, 01:24 PM
23. ### Overlap between groups

Hi everyone, I need some help on how to test overlap between two groups (men with sexual pain and men with sexual dysfunction) on their sexual...

• Replies: 2
• Views: 1,293
06-11-2015, 05:14 AM
24. ### Help with ANOVAS

1234567891

• Replies: 1
• Views: 1,439
04-15-2013, 07:21 AM
25. ### Not so trivial problem with expected value

Hello! This is a video game related question, but please, take it seriously. Assume we have a lake consisting of 528 tiles and among them are 4...

• Replies: 4
• Views: 2,073
12-27-2011, 05:26 PM
26. ### Need some help :)

Hi guys, im new to this forum, however, I am doing a dissertation paper and need to do some statistical analysis in which im very stuck. My...

• Replies: 0
• Views: 1,357
04-20-2012, 09:56 AM
27. ### Formulas for calculating the standard error of the mean.

Hi, The formula for calculating standard error of mean is S ⁻x=S/√n my question is the need for doing √n and not just n

• Replies: 1
• Views: 1,421
BGM
08-10-2011, 03:34 AM
28. ### Regression Poisson

Hi :wave:, first of all, sorry for my english, I'm not english. My question is a quite specific of a problem. I'm doing a regression of a Poisson...

• Replies: 6
• Views: 2,300
BGM
05-09-2013, 04:08 AM
29. ### Which method to use when sample sizes are very different?

Dear All, I'm trying to analyze the significance of difference between two groups. However the two groups have different sample size (one has 213...

• Replies: 5
• Views: 1,582
11-24-2015, 04:01 PM
30. ### Questions on Correlation Concepts

Hypothetically, say that I've found that the score for some physical health test (T) is strongly correlated to the time I spend working out in a gym...

• Replies: 2
• Views: 2,865
03-15-2006, 07:04 AM
31. ### Principal Component Analysis

Are the sample variances of principal components always positively biased compared to population variances? I know that the first principal component...

• Replies: 0
• Views: 3,608
03-15-2006, 06:53 AM
32. ### Question

Hello everyone. I am working on the following problem for my stat class: Assume that when victims are asked how well their needs were met by the...

• Replies: 0
• Views: 1,471
06-05-2013, 09:39 PM
33. ### Simple question.

I have a question I need help with and maybe someone could assist. I'm building a system for a class that predicts student attendance. I have...

• Replies: 0
• Views: 1,679
08-14-2008, 08:06 PM

Hello. First-time poster here. I've been having trouble trying to figure out how to analyze some data, and I would really appreciate some help. ...

• Replies: 0
• Views: 1,916
10-11-2006, 01:53 PM
35. ### Help with analysing a survey

I have survey consisting of 11 items (n=270), which are multidimensional. The items differ on a 5-point Likert scale. Apart from the rationale behind...

• Replies: 3
• Views: 2,241
01-26-2011, 01:39 AM
36. ### Partial autocorrelation of AR(3)

How to compute partial autocorrelation coefficients for an AR(3) model? Zt-a1Zt-1 -a2Zt-2 - a3Zt-3=et, where et is white noise WN(0, 1). If...

• Replies: 0
• Views: 3,108
12-04-2009, 02:48 PM
37. ### Is a paired t-test appropriate in this situation?

Hello, I distributed a survey comparing to different types of maps: conventional (paper) maps and a virtual map. The maps were compared using...

• Replies: 2
• Views: 1,514
03-14-2013, 09:32 PM
38. ### How to prove a non negative definite matrix has to be a variance-covariance matrix?

I know this is a iff condition,and the reverse is easy to prove.But I am having some difficulty to prove that all non negative definite matrices are...

• Replies: 4
• Views: 1,667
11-14-2012, 02:09 PM
39. ### Is the transpose of a g inverse the g inverse of transpose of the matrix?

While working with linear models,I came across the situation where the proof of some results might be easier if we apply that transpose of g inverse...

• Replies: 2
• Views: 1,862
12-02-2012, 09:00 AM
40. ### How do I compare variance and covariance accross groups (MANOVA)?

Hello everyone, As you'll guess, I'm pretty clueless in statistics, but I do try my best... So I'm doing a MANOVA, my sample sizes are all over the...

• Replies: 0
• Views: 1,184
art
05-01-2012, 11:26 AM
41. ### Conflicting Deducement - Which One Is Statistically Logic ?

(I have posted a similar thread here; the reason I'm posting the same thread here is because this section gets more viewers and so I hope somebody...

• Replies: 0
• Views: 3,169
03-04-2009, 09:02 AM
42. ### Quick Question about McNamre, Mann-Whitney U, and Chi-square, Cochran Q test

Hello, I am doing a study where I have to look at effect of demographic parameters on outcome in patients. For example to see if race has a...

• Replies: 1
• Views: 1,708
02-05-2012, 01:54 PM
43. ### World Series stat question

On StatTrek http://stattrek.com/Lesson2/Binomial.aspx?Tutorial=Stat there is an explaination of probability of World Series ending in exactly 5...

• Replies: 0
• Views: 2,201
08-01-2010, 06:37 AM
44. ### Best Way to Present Non-Normally Distributed Data

Hi, I wondered if anyone could give me advice on the best way to present two sets of continuous (not normally distributed) data. Would median ±...

• Replies: 3
• Views: 2,704
04-16-2014, 02:49 AM
45. ### Choosing between parametric, non-parametric, semi parametric

For an assignment I have to fit the best model to my data. The first step is to decide to which family it belongs to. My y variable is binomial...

• Replies: 2
• Views: 1,208
05-17-2015, 02:02 PM
46. ### Confidence Interval and P-value

I am trying to get my head around CI's and p-values and I am hoping this example will help. Lets say there were two seperate lots of research done...

• Replies: 3
• Views: 2,979
04-10-2011, 10:07 AM
47. ### Three parameter Weibull confidence intervals

I am using the Weibull distribution for reliability, mainly related to material fatigue. For the two-parameter fitting, there are methods for...

• Replies: 0
• Views: 928
07-03-2015, 09:40 AM
48. ### Designing an experiment

Could you plz answer this question? A firm is attempting to evaluate the quality of its sales staff and is trying to find an examination, or...

• Replies: 1
• Views: 923
10-27-2016, 12:19 AM

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