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# Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

1. ### 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: 200,376
07-16-2014, 11:01 AM
2. ### 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: 68,587
09-30-2005, 09:44 AM
1. ### Variance between two time series (action and feedback)

I would like to know how find the variance between two (or more) time series. I have a series of timings (in milliseconds) which represent the...

• Replies: 0
• Views: 2,483
04-05-2013, 02:32 AM
2. ### Variable transformation

Hi all, I've got a question concerning variable transformation: In many books it is recommended to use variable transformation, if your data is...

• Replies: 0
• Views: 1,042
04-05-2013, 02:12 AM
3. ### Potential confounding factor in study - am I analyzing this data properly?

I have conducted an experiment regarding the effects of tag size on fish survival (sample size = 90 fish), which I have simplified for ease of...

• Replies: 0
• Views: 1,036
04-04-2013, 09:23 PM
4. ### Zero-inflation models

Hi everyone, I've been researching these more and more due to some unusual data I have, but have a fairly overarching question I seem unable to find...

• Replies: 2
• Views: 1,487
04-04-2013, 08:25 PM
5. ### Understanding which simple effect to do and why

I've been struggling to figure out which simple effect test to do for my assignment, and most importantly why. The hypothesis is that the effect...

• Replies: 3
• Views: 1,344
04-04-2013, 07:08 PM
6. ### Question abour Anderson Darling test

Is k sample Anderson Darlıing test equavelent to Kruskal wallis test? Can I perform k sample Anderson darling test for comparing k groups instead of...

• Replies: 0
• Views: 1,442
04-04-2013, 04:00 PM
7. ### 2x3 factorial design

Hi, I need to analyse a 2x3 factorial design of an experimental group and a control group, doing 3 serial recall tests over time. so far I've used...

• Replies: 0
• Views: 2,629
04-04-2013, 01:31 PM
8. ### Will a t-test (or nonparametric equivalent) work for me?

I am trying to measure whether individual scores on a behavioural scale are statistically different from the average (median) score on that scale. ...

• Replies: 2
• Views: 1,440
04-04-2013, 11:06 AM
9. ### Help with small-sample sampling distributions

Hello, I'm having problems to build an approximate distribution for the mean and the standard devistion using a results from a sampling distribution...

• Replies: 2
• Views: 1,351
04-04-2013, 10:27 AM
10. ### Confusion Matrix

Hi everyone, I have a question involving confusion matrix's I'm unsure on how to answer. A programmer runs 1000 files of his Java code through...

• Replies: 1
• Views: 1,655
04-04-2013, 10:20 AM
11. ### Averaging regression coefficients for 50 regression , how to report t statistic ??

hi i have estimated same regression equation for 50 stocks, i need to report the cross sectional average of the regression coefficients, how can i...

• Replies: 3
• Views: 3,191
04-04-2013, 09:41 AM
12. ### Interpreting an unstandardized partial regression coefficient

Hi, anyone know what two equivalent interpretations of the below unstandardized partial regression is? Y^MathsValue = -7.31-0.27XAnxiety +...

• Replies: 0
• Views: 3,184
04-04-2013, 06:32 AM
13. ### confused on which statistic test to use for a Questionnaire

Hi I was wondering if any one could help me with which statistical test to use for my dissertation. Basically i have conducted a questionnaire using...

• Replies: 9
• Views: 1,971
04-04-2013, 04:10 AM
14. ### 2 or more DV in the regression

Hello, I have 3 DV's and 10 IV's. I want to know for each dependent variable separately by which independent variable it is affected most? what...

• Replies: 0
• Views: 1,050
04-04-2013, 01:32 AM
15. ### Some Help Reading The t Distribution: Critical t Values

For the first one. Find the t-value such that the area in the right is .25 with 15 degrees of freedom. I looked down and it was 2.131... However...

• Replies: 0
• Views: 999
PSG
04-03-2013, 11:30 PM
16. ### Computing degrees of freedom

Suppose 2 fields are randomly assigned to fertilizer A and fertilizer B. Each field is composed of 4 plots. Each plot within each field is randomly...

• Replies: 1
• Views: 1,372
04-03-2013, 10:31 PM

Hi all, I am currently writing a research proposal and am stuck on what statistical tests to use. Ill explain the study: I am testing the...

• Replies: 3
• Views: 1,661
04-03-2013, 04:59 PM
18. ### How to determine known variability for acceptance sampling?

Hi, I am responsible for designing quality control sampling plans for diagnostic kits. I have been using a sampling plan by variable for unknown...

• Replies: 0
• Views: 1,598
04-03-2013, 01:20 PM
19. ### How to deal with a bifactor solution with negative loadings on group factors

I´m a little confused: I tried to calculate a bifactor solution and afterwards omega like in e.g. "The Rediscovery of Bifactor Measurement Models;...

• Replies: 0
• Views: 1,677
04-03-2013, 10:07 AM
20. ### Dice's similarity coefficient (aka nei and li). significance...

I've been struggling with the Dice coefficient for days now. I understand that the closer to 1 the cases are the more similar they are but is there...

• Replies: 1
• Views: 5,013
04-03-2013, 03:33 AM
21. ### Testing for correlation between multiple categorical and continuous variables

Hello, Would somebody be able to help me out please? please let me know if you need further information. I am currently using SPSS 21. I have 5...

• Replies: 0
• Views: 2,557
04-03-2013, 03:17 AM
22. ### Chi-square from 1 list or 2 lists?

Hello I have data from 2 exams and the gender of those achieved high grades, top 50 . For examples Exam 1 - Exam 2 male - female male -...

• Replies: 0
• Views: 1,283
04-02-2013, 08:44 PM
23. ### using stata to regenerate a indicator variable

I have a variable that is a semi-indicator variable. For the range 0 to 5 it is assigned a value of 1 the range 5 to 8 is assigned a value of 2...

• Replies: 0
• Views: 1,439
04-02-2013, 04:38 PM
24. ### repeated measures factorial design

Suppose you have two factors A and B each with 2 and 3 factors respectively and 12 subjects are randomly assigned to each of the possible 6...

• Replies: 0
• Views: 1,349
04-02-2013, 02:16 PM
25. ### chisq.test with different sizes

Hi, I have a simple question...but I need your help. It's possible to apply a chisq.test for two groups of data with different sizes? For...

• Replies: 0
• Views: 1,110
04-02-2013, 11:30 AM
26. ### Judging the similarity by squared Euclidean distance

I want to use a numerical tool for comparing 2 windroses. A paper I found recommends using squared Euclidean distance. My question is which values of...

• Replies: 4
• Views: 1,713
04-02-2013, 07:21 AM
27. ### Stuck with homework (Statistics on Usability)

done. thanks.

• Replies: 1
• Views: 1,902
04-02-2013, 05:25 AM
28. ### Can someone help me with finding the P-Values for these problems?

I have a test tomorrow and am not understanding this section very well. I need help on two problems if someone can explain how to do them! Pleaseeee!...

• Replies: 0
• Views: 1,874
04-01-2013, 05:39 PM
29. ### Group sizes. How to group ability score into three levels...?

I have a variable that i want to collapse into three groups according to some achievement: high, medium and low. The "continuous" variable is...

• Replies: 2
• Views: 2,004
04-01-2013, 04:40 PM
30. ### t test vs anova?

I'm doing an experiment where there will be two groups chosen randomly ( one control group and one treatment group), one independent variable and two...

• Replies: 3
• Views: 1,899
04-01-2013, 01:36 PM
31. ### Comparison of funds

Hello! im writing a paper where i am going to compare the performance of equity funds and hedge funds. My data consist of 5 year monthly returns...

• Replies: 0
• Views: 2,659
04-01-2013, 11:13 AM
32. ### Can't run Independent-Samples T-test

Hello, everyone, I need a piece of your help on a popular question of Statistical Test Choosing :confused: I have an Experimental Group and a...

• Replies: 3
• Views: 1,670
04-01-2013, 02:34 AM
33. ### Statistics- Sample proportion?

According to a 2010 report, 85 % of women in NA shop online. 1) Describe the population of interest 2) Describe the population proportion of...

• Replies: 1
• Views: 1,126
04-01-2013, 01:47 AM
34. ### Descriptive analysis

I have a ranking of 1- most effective, 2- next effective, and so on. When I analyze this would I use univariate of ordinal or interval/ratio? I did...

• Replies: 1
• Views: 988
03-31-2013, 07:08 PM
35. ### Standard Deviation of Sampling Distribution for Coefficient

Hi, I am having a bit of terminology-related confusion. I am running a regression model with three independent variables and have obtained a...

• Replies: 0
• Views: 1,241
bkd
03-31-2013, 07:02 PM
36. ### Predict value of Y from given X value, mean, SD and r

Given data x¯=119 S.D of x=10 y¯=1.30 S.D of y=0.55 r=0.7 How to calculate the predicted value of Y if X = 130 ? I can't use

• Replies: 6
• Views: 4,618
03-31-2013, 06:08 PM
37. ### Significant Change in F, R2

Hey all, I am running a hierarchical multiple regression in which I start with three independent variables in step one and add another independent...

• Replies: 0
• Views: 3,713
03-31-2013, 04:49 PM
38. ### Help with statistics for experiment! ANOVAs

Hey all, I'm working on a research project in my undergrad and I really need some help with the stats! I have Excel and SPSS to work with so...

• Replies: 6
• Views: 2,623
03-31-2013, 03:47 PM
39. ### Find correlation when SD and mean are given

A guy got 88 in his test which has mean score of 64 with SD 8. He missed the second exam in which the meanscore was 45 and SD was 5. He got a...

• Replies: 2
• Views: 3,104
03-31-2013, 11:56 AM
40. ### Applying Normal Distribution

So here is the question followed by what the steps I took to solve it. Please let me know if I have done this correctly: Question: The time...

• Replies: 0
• Views: 1,462
03-30-2013, 10:08 PM
41. ### Which nonparametric test to use for comparing two related samples?

Hi, I am looking to compare day and night time depths for basking sharks in SPSS. I found that if I have day depths for all sharks together I can...

• Replies: 2
• Views: 1,022
agp
03-30-2013, 08:35 PM
42. ### Statistical tests

Hello Im new to stats, please bear with me. I need to know which statistical test to apply to my data. Ihave two questions. 1. I collected data...

• Replies: 1
• Views: 1,603
03-30-2013, 11:26 AM
43. ### Normal Probability Distribution. Find X

Hello! Can you find a right answer? Please, read first! The manufacturer of a laser printer reports the mean number of pages a cartridge will...

• Replies: 2
• Views: 6,008
03-30-2013, 02:34 AM
44. ### Need Help with confidence interval problem

Hello I have been working on this problem for the past couple of days and I can't figure it out. I would appriciate any help that is given. The...

• Replies: 1
• Views: 1,314
03-29-2013, 09:38 PM
45. ### Central tendency statistic

Which central tendency statistic is overused and which is underused by managers? Why? Give a business example for each. can someone help me with this...

• Replies: 1
• Views: 3,830
03-29-2013, 04:35 PM
46. ### Which method to choose?

I am new to statistics and i don't know which method to use... There are the data which asked people usage of 3 media(facebook twitter cell) ; the...

• Replies: 3
• Views: 1,616
03-29-2013, 12:37 PM
47. ### Stats Help Needed! Can you do inferential stats with z-scores?

In my undergrad research project, I used a previously validated questionnaire (the DEQ). I contacted the authors of the original study, who sent me...

• Replies: 2
• Views: 1,455
03-29-2013, 02:56 AM
48. ### Probability Homework Help...

This is the exact question:

• Replies: 0
• Views: 1,552
03-28-2013, 05:01 PM
49. ### Normal distribution (not bivariate distribution) assumption with Correlation???

So I have two variables that I want to check for correlation. I know that the analysis assumes to have a bivariate normal correlation, which I...

• Replies: 2
• Views: 2,235
03-28-2013, 03:38 PM
50. ### STATA problem with 'collapse' command for t-test and regression for clustered data

Dear All, I'd be very grateful advice on stata commands needed to analyse trial results by cluster. i have 12 clusters, 6 for the intervention arm,...

• Replies: 0
• Views: 1,843
03-28-2013, 02:19 PM
51. ### estimator for geometric distribution

The ans for part (ii) is 1/sample mean i want to know how to prove that it is bias/unbias in part (iii), i have think of it several days...

• Replies: 3
• Views: 1,428
BGM
03-28-2013, 01:00 PM
52. ### n=1

Hi all, This may sound like a really ridiculous question but I am completely ignorant about statistics - I have undertaken a small university...

• Replies: 2
• Views: 1,726
03-28-2013, 11:00 AM
53. ### Help! What should I be doing with this +/- data? Thanks

Hi, I am having a complete brain malfunction! I am testing footprint stations for rat detection, and want to look at how placement effects...

• Replies: 0
• Views: 1,127
03-28-2013, 07:28 AM
54. ### hypergeometric expectation

• Replies: 3
• Views: 954
BGM
03-28-2013, 12:10 AM
55. ### C function for multivariate Gaussian integrals

Hi everybody, I'm looking for functions in C which can evaluate the integral of a multivariate Gaussian (normal p.d.f) over a box in high...

• Replies: 0
• Views: 1,558
03-27-2013, 06:39 PM
56. ### Centering gives negative numbers?

Hi, I have centered some variables. These variables were means as this is how the test I used is scored. Can I just make the negative number absolute...

• Replies: 3
• Views: 1,399
03-27-2013, 02:42 PM

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