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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: 196,542
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: 66,610
09-30-2005, 09:44 AM
1. ### Analyzing skewed data, how to determine % spread and variation? Testing method error

Hello everyone, I'm trying to determine the overall error of a measurement method by comparing it to the true value. I have a set of data which...

• Replies: 9
• Views: 499
09-06-2017, 11:47 PM
2. ### Analyzing Tagged Content: Is a Multiple Regression Analysis the Right Approach?

I’m working with a relatively small data set that consists of several hundred social media posts, key engagement metrics and up to 10 content “tags”...

• Replies: 1
• Views: 488
06-01-2017, 11:49 PM
3. ### Analyzing the percent of time present in 5 areas

I was trying to figure out the best way to analyze a divided area used by an animal and the percent of time this animal spent in each of the 5 areas....

• Replies: 0
• Views: 1,253
03-09-2013, 07:15 PM
4. ### Analyzing winrates between populations

Hello! I am a graduate student and I have already completed my (very limited) statistics requirements for my field in undergrad. That is to say...

• Replies: 1
• Views: 671
04-16-2017, 12:39 PM
5. ### Analyzing/Understanding Results from Factor Analysis

I ran a factor analysis on a data set (running both an orthogonal and oblique rotation). The data is from surveys completed by middle-school students...

• Replies: 1
• Views: 3,583
11-17-2009, 03:12 PM
6. ### Anchoring Items on a Scale

I am having difficulty telling which items I need to recode so the scale I am analyzing has the same anchor for all items. Once I recoded the ones...

• Replies: 2
• Views: 1,053
11-02-2013, 05:35 PM
7. ### Ancillarity

Hi guys. I have a question for you. When I need to find a sufficient statistic for a given model, it's easy to apply the factorization theorem and...

• Replies: 0
• Views: 1,665
01-21-2012, 03:10 PM
8. ### Ancova

hei, i am comparing body-measyrments of two groups of fish that are fed different diets against each other. the problem is that the two diets...

• Replies: 2
• Views: 3,301
mia
04-24-2007, 05:23 AM
9. ### Ancova

Hey, I'm using a two-way ANCOVA for my statistics assignment, but I don't know how to determine whether its a 2x2 or 3x2 ANCOVA (there are two...

• Replies: 2
• Views: 2,820
09-27-2009, 11:51 AM
10. ### ancova

Hello, I have a set of data (Xi,Yi) to which I fit a curve: Y=a*X^b, I use matlab to determine a and b. I also have a model equation: Y=a0*X^b0....

• Replies: 0
• Views: 1,115
09-23-2013, 05:41 PM
11. ### ANCOVA - conflicting results, how to code test

I carried out a group project on a uni field course looking at whether a species' vigilance was affected by whether or not there were young in the...

• Replies: 1
• Views: 1,232
02-19-2017, 04:56 PM

I read that when using ANCOVA to control a co-variate, the covariate and the independent variable should be independent. How about if the covariate...

• Replies: 0
• Views: 2,449
10-25-2009, 11:50 AM
13. ### ANCOVA - testing interactions with multiple covariates

Hello, I have a question concerning ANCOVA and was hoping one of you could help me out :). I tried looking all over the internet and of course in...

• Replies: 4
• Views: 6,220
12-13-2012, 05:20 PM
14. ### Ancova : A specialised model

Hi all, I have a cross sectional data obtained from two independent groups. I have just made a logarithmic transformation of the outcome variable...

• Replies: 0
• Views: 1,280
04-01-2012, 12:53 PM
15. ### ANCOVA and stratified sample

Hello folks! I want to measure the effect of an intervention (dummy variable) on a continuous variable in a controlled intervention trial. I...

• Replies: 2
• Views: 2,533
10-09-2015, 10:50 AM
16. ### ANCOVA Clarification

Hi Everyone, I'm doing simple effects analyses in SPSS with two IVs and a Covariate, by splitting the file for my first IV. I see...

• Replies: 0
• Views: 1,833
12-11-2006, 04:50 PM
17. ### ANCOVA example with data included?

Hi, I tried to find some ancova example(s) where data has been included, to reproduce the results. Unfortunately could not really find one. I...

• Replies: 1
• Views: 5,569
12-06-2009, 05:35 PM
18. ### ANCOVA help

Hello, I am ran a 2 (group)x 3 (time) repeated measures ancova. the interaction was signficant. I am not sure what to do at this point. Are imple...

• Replies: 0
• Views: 1,713
07-27-2008, 12:59 PM
19. ### Ancova help

Please help! I feel like I'm doing something wrong. I am using the Tabachnki & Fidell 5th ed. Using Multivariate Statistics text. Chapter 7 is the...

• Replies: 0
• Views: 2,406
02-23-2009, 11:55 AM
20. ### Ancova help

Hi, This is my first time posting here, so please forgive me if I'm not accurate enough. I've been doing an ancova in R. This is what I have...

• Replies: 8
• Views: 3,564
04-15-2009, 09:46 AM
21. ### ANCOVA Help

I am giving a pretest and then a posttest after using clickers. Should I use an ANCOVA? What would my covariate be? I am thinking it would be the...

• Replies: 0
• Views: 2,937
10-06-2009, 07:21 PM
22. ### Ancova heterogeneous regression slopes assumption

Hi everyone If the heterogeneous regression slopes assumption violated, What should i do? Thanks

• Replies: 0
• Views: 722
01-09-2014, 09:16 AM
23. ### ANCOVA nightmare!

Help! I have four groups of pre and post test scores. One set is a control group. I must do a dependent t test and ancova, using the pretest as the...

• Replies: 1
• Views: 2,368
02-22-2009, 05:23 PM
24. ### ANCOVA or oneway-ANOVA on gain scores

Hi everybody. I'm curious to know which is the most correct/preferred method to analyse my data. I've got a randomised clinical trial with...

• Replies: 1
• Views: 1,302
04-13-2016, 05:38 AM
25. ### ANCOVA post hocs?

How do I do post hocs for ANCOVAs?

• Replies: 2
• Views: 4,167
04-18-2009, 01:23 PM
26. ### ANCOVA Power calculation?

Hi. I would be very grateful if anyone could tell me how to do a power calculation for an Analysis of Covariance study design. I have Cohen's tables,...

• Replies: 0
• Views: 5,832
01-06-2007, 07:26 AM
27. ### ANCOVA question

Hi All ... Why is it that the corrected model in an ANCOVA has a different value than the DP for an ANOVA? (I just know that sounds stupid). ...

• Replies: 6
• Views: 2,831
07-20-2011, 12:27 PM
28. ### Ancova regression or correlation

Hi Everyone, I tried thison the psychology stats forum but never had any takers so thought I'd see if I get an opinion here. I'm postgrad student...

• Replies: 0
• Views: 1,694
07-13-2011, 07:45 AM
29. ### Ancova repeated measures changing covariate

I have a three factorial 3 by 3 by 3 data set, where all three independent variables are repeatedly measured. For each of the 27 conditions I have...

• Replies: 0
• Views: 899
07-17-2012, 05:58 AM
30. ### ANCOVA test of homogeneity of regression slopes

Hi, I recently learned how to conduct ANCOVAs in SPSS and know that one of the assumptions that needs to be tested is the assumption of homogeneity...

• Replies: 2
• Views: 20,833
05-05-2009, 01:48 PM
31. ### ANCOVA Test?

Just a general question about the appropriateness of ANCOVA in this situation. Let’s say 2 identical retail stores are each utilizing a different...

• Replies: 0
• Views: 1,236
05-31-2012, 12:32 PM
32. ### ANCOVA versus regression: Independence of the covariate and treatment effect.

Hi, if you read about the assumptions of an ANCOVA, you find the following assumption: "independence of the covariate and treatment effect". ...

• Replies: 1
• Views: 1,331
12-30-2015, 12:13 PM
33. ### ANCOVA violating homoscedasticity

I've come across a problem in ANCOVA that I can't seem to figure out. I have a sample size of over 600 people. I've got a 2 (male vs female) x 3...

• Replies: 14
• Views: 11,314
02-20-2011, 11:56 AM
34. ### ANCOVA when variances are not equal?

I am currently writing a 4th year freshwater biology report analysing data collected on the length and weight of fish from 2 sites, collected over 3...

• Replies: 6
• Views: 7,854
02-07-2016, 11:54 AM
35. ### ANCOVA with more than 2 covariates. homogeneity of regression slopes.

Hello, I am carrying out a ANCOVA with more than 2 covariates with SPSS. I want to check the homogeneity of regression slopes to confirm the...

• Replies: 2
• Views: 1,511
10-06-2015, 08:16 PM
36. ### ancova with nominal variables

Hi everyone, I am running some ANOVAS and ANCOVAS with behavioral data and I was told that I cannot use nominal variables (qualitative variables),...

• Replies: 2
• Views: 6,148
05-27-2009, 04:53 PM
37. ### ANCOVA, calculate adjusted means

Hi, I have a 3x3 within-subject design with a few covariates. I need to calculate the means and standard errors for each condition adjusted for...

• Replies: 0
• Views: 1,486
Ila
10-29-2015, 03:30 PM
38. ### And help with this one too….

Suppose the yearly rainfall totals for a city in northern California follow a normal distribution with a mean of 18 inches and standard deviation of...

• Replies: 1
• Views: 217,288
09-07-2011, 10:42 AM
39. ### Anderson Darling Normality Test in Minitab... normality query?

Hello! I hope someone out there can point me in the right direction over a query I have with my stats analysis of a project. I want to compare...

• Replies: 1
• Views: 12,445
fem
11-21-2011, 04:14 PM
40. ### Anderson-Darling - Test for Lognormality

I am testing for Lognormality of the following data (R-Code): fish <- c(0.6,0.7,1.1,1.3,1.8,2.0,2.3,2.7,2.9,3.1, ...

• Replies: 0
• Views: 3,637
03-10-2013, 07:32 PM
41. ### Anderson-Darling Normality Test

Hi all, I am not big with statistics or excel, so forgive me if I ask basic and simple questions. I have a macro set up in excel '07 to...

• Replies: 3
• Views: 6,125
01-26-2013, 07:41 AM
42. ### Annotation of bootstrapping

Hi all, I've been asked by reviewers to make the methods section of a paper more formal. The method in short is bootstrapping a probability...

• Replies: 2
• Views: 1,502
12-27-2015, 05:48 PM
43. ### Annualized volatility

Hi, I was just wondering which is the better way to calculate annualized volatility (std dev) on a series of returns over a given period. E.g. if...

• Replies: 0
• Views: 3,863
01-20-2009, 05:29 PM
44. ### ANOCOVA or Gain score?

Hi everyone, I'm a newbie Ph.D. student and encountering an issue regarding which analysis to use for my study. Please help me out if you have...

• Replies: 5
• Views: 2,218
05-29-2016, 06:08 AM
45. ### ANOP / ANOMP: what if n_i * p_i < 5 for one i and n_i * p_avg >> 5 ?

I'm constructing ANOMP/ANOP graphs to follow-up inspectors in a steel factory. In literature (eg The analysis of Means, Peter R. Nelson) they...

• Replies: 0
• Views: 834
01-29-2016, 03:34 AM
46. ### Another CTL Question

The percentage of University of Illinois students that have taken either Economics 102 or 103 is 85 %. Suppose random samples of 225 students are...

• Replies: 4
• Views: 2,590
11-07-2010, 03:20 PM
47. ### another hypothesis

a teacher gives an exam with 10 "true/false" questions. in order to check the hypothesis H0 that the student is answering randomly, the next decision...

• Replies: 0
• Views: 1,828
07-07-2009, 10:10 AM
48. ### Another Hypothesis Question

OK...pls give me an idea where to start this one...I want to learn the steps, not be given the answer...I'm not looking for charity, just lost in...

• Replies: 2
• Views: 2,051
04-02-2006, 10:43 AM
49. ### Another name for T(1)

What's another name for T(1) random variable? (Student's T distribution with 1 degree of freedom) Thanks!

• Replies: 1
• Views: 3,109
11-17-2010, 07:22 PM
50. ### Another proportion question-help much appreciated

Say I know 3000 people were canvassed by a political party, 2200 of them went out to vote. Of the 7000 not canvassed, 4000 went to vote. What...

• Replies: 2
• Views: 2,418
12-21-2006, 08:46 AM
51. ### Another question of which test to use...help

A admin of speech and hearing clinic conducted a study to determine if their clients were evenly divided between men and women. The study of all...

• Replies: 1
• Views: 2,064
05-12-2008, 02:50 PM
52. ### another simple question linear algebra

Hi there, If we know that: B is a 2 by 1 vector. C is a 2 by 1 vector. B!=C.

• Replies: 1
• Views: 2,913
10-13-2008, 11:37 AM
53. ### another stats question

the mahi rent-a-car company is intgerested in estimating the mean number of miles its cars areg driven on a particular holiday. it has 23000 cars...

• Replies: 0
• Views: 2,281
04-29-2007, 02:46 PM
54. ### Another, more specific, Likert Scale Analysis question

Hi all, Would really appreciate any help, been a good few years since I did any Statistics and they were just some modules at uni, not sure it...

• Replies: 3
• Views: 1,041
07-19-2012, 04:51 AM
55. ### Anova

Hi, i was having trouble calculating two-way ANOVA's.. i couldnt quite get the equations that my professor had posted can .. is there a website...

• Replies: 1
• Views: 2,488
11-29-2005, 02:29 PM
56. ### Anova

Hi there, I would like to test whether there are any significance differences between the responses of subjects that took part in a experiment. ...

• Replies: 0
• Views: 1,417
jdm
09-25-2008, 03:18 PM
57. ### Anova

What does the result of an ANOVA test tell? If I used an ANOVA to test whether a variable is a spurious variable to a given focal relationship and I...

• Replies: 1
• Views: 1,257
06-02-2012, 09:49 AM

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