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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: 197,080
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: 66,915
09-30-2005, 09:44 AM
1. Statistical Test for differences Across time Between Independent Groups

Hello everyone. I am trying to determine if there is a statistical model that would allow someone to test for differences between two different...

• Replies: 6
• Views: 1,679
04-10-2014, 07:04 PM
2. correlating many time series to find functional pairs

Hi there, I'm a neuroscientist in deep water, trying to do things that aren't standard in my field. I have a strong feeling there are established...

• Replies: 0
• Views: 945
04-10-2014, 06:42 PM
3. Trouble with determining the probability of exceding some extreme value

I fitted a normal distribution to my dataset of N=200 lengths. The chi-square test shows it's a pretty good match. I intended to use this normal...

• Replies: 10
• Views: 1,538
04-10-2014, 12:10 PM
4. comparing inter-individual differences - difference across values within a group

Hello! I am trying to find a way to determine whether there is a statistical difference between learning rates across 8 individuals. I read about...

• Replies: 0
• Views: 1,417
04-10-2014, 07:34 AM
5. Removing the affect of a set on a different set

Hey all, First time here, not a native English speaker and in no way a statistician, so please pardon for any ignorance I might exhibit :) As a...

• Replies: 6
• Views: 1,377
04-10-2014, 05:20 AM
6. critical values

Hi everybody, I am working on a significance test and trying to compute p-values or the corresponding critical values. I want to carry out a...

• Replies: 2
• Views: 1,017
04-10-2014, 02:34 AM
7. When can the normal be used to approximate the hyperGeometric?

Hello all. I know the normal can be used to approximate the binomial when p is not close to 0 or 1, and when the population is extremely large...

• Replies: 0
• Views: 1,487
04-09-2014, 07:40 PM
8. Linear Mixed Models

In Laird & Ware (1982) , Yi : (ni * 1) response vector， so is this vector a multivariate response for one subject ? Could someone give me an...

• Replies: 1
• Views: 1,350
04-09-2014, 06:28 PM
9. [SOLVED] Better way to display indicator function.

I have an indicator function I am displaying in an R manual. I am trying to make it as one line (and more readable) so it looks good in the HTML...

• Replies: 5
• Views: 1,668
04-09-2014, 12:56 PM
10. Multiple Linear Regression - really need help

Hi, I'm going out of my mind...really need help. I have one continuous dependent variable (test scores) and 6 categorical (with 2 categories -...

• Replies: 8
• Views: 2,348
04-08-2014, 11:01 PM
11. Which model would be best to do this

Hello everyone. I have been given a data set and tasked with coming up with a way to compare different people (real estate professionals) to each...

• Replies: 0
• Views: 914
04-08-2014, 10:49 PM
12. Regression on multiple distributions within one dataset

Hello everyone. I am attempting to do a regression analysis on the sales price of a property. I have several variables of interest. The main ones...

• Replies: 0
• Views: 1,393
04-08-2014, 10:44 PM
13. Multivariate analysis and survival

Dear Friends, I needed a help in deciding the right test using SPSS and how to do it please. I am comparing survival of two different cancers....

• Replies: 0
• Views: 1,046
04-08-2014, 09:48 PM
14. Need help on mutliple regression analysis output in minitab

Gentlemen\Ladies I need some expertise view on the regression analysis output i've been recieving..i am not a stat genious but i use minitab to...

• Replies: 1
• Views: 1,060
04-08-2014, 07:06 PM
15. Factorial Experiments

Hello if you can take a look at this assignment to better understand what I am talking about: http://imgur.com/xypjFHS From what I understand I...

• Replies: 0
• Views: 889
04-08-2014, 06:48 PM
16. Satterwaite approx -- utterly confused!

• Replies: 0
• Views: 1,174
Ker
04-08-2014, 04:30 PM
17. Help! What statistical test should I use?

First, I’m sorry if I make a lot of mistakes ; English is not my first language :S I’m a bit lost… I made a questionnaire on homophobic...

• Replies: 1
• Views: 806
04-08-2014, 04:11 PM
18. one way anova vs. multiple comparisons

I'm using matlab to study significance different in mean for deviation in the thre directions 8vrt, lng and lat). with one way anova i get no...

• Replies: 1
• Views: 1,018
04-08-2014, 12:08 PM
19. Best statistical method for the following data set?

Hello everyone I need to compare the inventory of supplies used for the same medical procedure at two different hospitals. Not all supplies are...

• Replies: 2
• Views: 1,179
04-08-2014, 12:03 PM
20. non linear regression

hi, I want to estimate quasi hyperbolic discounting model: x= b* (1/(1+r)^t) *y where b and r are my parameters and i want to estimate them...

• Replies: 1
• Views: 806
04-08-2014, 08:39 AM
21. Probability

Question 1 Consider the following frequency table with scores on a variable X of individuals from a population. X Frequency of X 2 ...

• Replies: 1
• Views: 823
04-08-2014, 07:58 AM
22. Repeated measures help! (Friedmans Test)

............

• Replies: 1
• Views: 1,205
04-08-2014, 05:39 AM
23. Determining the right test????

Hello all, I am designing a study for my beginning stats class and can't decide what type of test I should use. I am planning to assess 2...

• Replies: 1
• Views: 1,139
04-08-2014, 12:38 AM
24. Non-parametric test for trend suggestions needed

Hello, I am conducting trend analysis on rainfall time series using the Mann-Kendall rank correlation coefficient (tau). I would like to also use...

• Replies: 2
• Views: 1,748
04-07-2014, 10:46 PM
25. Could you give me the lowdown on psychology and large samples?

I vaguely remember reading that given a large enough sample size any effect can be shown in psychology--is this true? Or at least I read a few snarky...

• Replies: 5
• Views: 1,640
04-07-2014, 08:04 PM
26. How to average coefficients' standard errors?

Hi, I'm considering a "mean-group"-estimator, where the estimated coefficients are unweighted means of multiple regressions from different groups....

• Replies: 14
• Views: 2,853
04-07-2014, 02:56 PM
27. testing for heteroskedasticity

In a thesis is it best to report the heteroskedasticity of the initial data, test the entire model or both? ie: Model: Breusch-Pagan /...

• Replies: 4
• Views: 2,616
04-07-2014, 01:24 PM
28. Help understand probability in a simply random sample

Quoted is an extract for Sample Survey Principles and Methods, Vic Barnett(2002) Pg 34 The concept of probability averaging only arises in...

• Replies: 0
• Views: 952
04-07-2014, 06:56 AM
29. 'Alternate' proof that the expected value of the sample mean is the population mean

It would be appreciated if someone could verify that this makes sense. By definition \bar{x} = \frac{\sum x_i}{n} So taking its expectation we...

• Replies: 3
• Views: 3,097
BGM
04-06-2014, 03:35 PM
30. Checking for difference between respondents and sample population

Hi there, I am working on an evaluation. The study population is 3,000 participants. We completed surveys with 81 percent of of particpants (2,430...

• Replies: 0
• Views: 839
04-06-2014, 09:53 AM
31. central tendency and dispersion

Let’s assume you have a population of 2000 beers of different brands and whose mean level of tastiness is 8.5 (on a scale from 1 to 10 ) with a...

• Replies: 0
• Views: 873
04-06-2014, 07:05 AM
32. Using a Wilcoxon Signed-Rank test on three treatments in Excel

Hi all, I conducted an insurance game for my experimental econ class where buyers decide to either buy or not buy, and sellers decide to either...

• Replies: 0
• Views: 1,555
04-05-2014, 09:00 PM
33. ACF graph output -> how to proceed

I intend to use a dummy variable model to test the significance of the dummies. Looking at the ACF/PACF data, the autocorrelation never 'slopes off'...

• Replies: 1
• Views: 1,406
04-05-2014, 08:38 PM
34. Help with proof that expected value of x_i is the populaton mean X bar

I'm having a little trouble with the proof that the expected value of x_i is \bar{X} . What I have is E=\sum_{j=1}^{N}X_j Pr(x_i=X_j) ...

• Replies: 6
• Views: 1,304
04-05-2014, 04:19 PM
35. Assumption of Normality

Is the normality regression assumption that the sample data is normally distributed or that the residuals are? In a thesis is it worth reporting on...

• Replies: 1
• Views: 1,358
04-05-2014, 02:10 PM
36. Can correlation be read by two 1-dimensional graphs?

Let's say we either want to look at empirical correlation, or theroeatical between two random variables. Can this be found be examining the two...

• Replies: 4
• Views: 962
04-05-2014, 11:43 AM
37. Variance Homogeneity Tests from Summary Data

Hello all, is it possible to test for equal variances given summary data (i.e. only n, mean, and standard deviation) as the input? If so, what is the...

• Replies: 3
• Views: 1,538
04-05-2014, 10:47 AM
38. Two questions about appropriate tests

Hi, I'm an undergrad student in the uk struggling to answer one simple question and one slightly more complex one. Any help on this would be deeply...

• Replies: 1
• Views: 1,176
04-05-2014, 07:03 AM
39. RSD of multiple samples

Hello! This is probably a very basic question, so here goes! I am supposed to calculate the RSD of some tests i did in chemistry. The sample...

• Replies: 2
• Views: 1,599
04-05-2014, 06:23 AM

Hi there I am hoping you can help me out with a confusing topic. I have a 2x3x4 repeated measured anova. I have a significant 3-way interaction,...

• Replies: 5
• Views: 3,009
04-05-2014, 04:17 AM
41. 2-way ANOVA and the post tests

Hi everyone :) I was wondering if you could help me with a question which should be simple... but the more I am trying to figure it out, the more...

• Replies: 0
• Views: 1,697
04-04-2014, 05:45 PM
42. Post-hoc analysis for Fisher's Exact Test

Hello all! I am using Fisher's Exact Tests to analyse a series of 2x2 contingency tables with small values. But are there any other tests I can...

• Replies: 4
• Views: 4,179
04-04-2014, 03:40 PM

Dear forum members I have a midterm this monday at my university and me and my friends can't come up with a result, we have tried everything, i...

• Replies: 2
• Views: 1,044
04-04-2014, 03:23 PM
44. Theoretical questions about Chi goodness of fit & Fisher's Exact tests

Hello statisticians, My main questions are; 1) For a Chi goodness of fit test, which effect size do you use? I am being told Cramer's V, Phi,...

• Replies: 5
• Views: 2,646
04-04-2014, 03:06 PM
45. *Novice* Which test? Is one even possilble

Hi Everyone, I am a complete novice to the world of statistics and I'm not the best mathematician. I have the data of three different city...

• Replies: 2
• Views: 1,745
04-04-2014, 12:38 PM
46. Accounting for Pre-existing differences between Control and Treatment groups

I've got two sets of sales data. I want to compare the two groups after one has a sales program applied to it. However, the treatment group already...

• Replies: 3
• Views: 1,429
04-04-2014, 10:30 AM
47. planned comparisons - contrast coefficients - trends

Hello! I’m going to conduct planned comparisons with contrast analysis in ANOVA. In particular I am interested in trend analysis. The problem is...

• Replies: 0
• Views: 1,031
04-04-2014, 10:12 AM
48. Which Test?

Hi, I came across a question in the college. The scores awarded to 10 contestants in a competition by three judges were given. We had to use some...

• Replies: 0
• Views: 1,118
04-04-2014, 08:39 AM
49. Dummy variable model problems

My model is as follows: y = b1Jan + b2Feb + ..... + b12Dec + X + et Info: Without omitting the constant I have to omit one of the monthly...

• Replies: 1
• Views: 1,084
04-04-2014, 04:41 AM
50. Help w/ Choosing Correct Statistical Test

Hi everyone, I was wondering if anybody could help me figure out the right statistical test for my study... I have 2 independent populations of...

• Replies: 6
• Views: 2,291
04-03-2014, 06:59 PM
51. Regression analysis or ANOVA for unequal sample sizes

Hello everyone :) First I want to apologize for my Eniglish, I´m not a native speaker. I am currently working on a research for school...

• Replies: 4
• Views: 4,245
04-03-2014, 01:27 PM
52. Standardizing or normalizing two different sales variables before regression?

Hello there :wave:, I'm currently involved in research, but I have to admit that I'm quite insecure in my math / statistics abilities, which is...

• Replies: 0
• Views: 2,583
04-03-2014, 09:43 AM
53. Are McNemar's and Binomial the right tests for my data

Hi everyone. I have performed an experiment, where I have real and synthesised movie data. My participants were shown either a real movie, or a...

• Replies: 2
• Views: 905
04-03-2014, 08:20 AM
54. The rationale behind bootstrap percentile interval?

When we create a confidence interval for our parameter, using a bootstrap percentile interval, , we find the empirical percentiles of the bootstrap...

• Replies: 7
• Views: 2,047
04-03-2014, 08:12 AM
55. Sampling with or without replacement

I'm having some problems understanding the implications of sampling with replacement or sampling without replacement. I understand that if you...

• Replies: 5
• Views: 1,958
04-03-2014, 02:37 AM
56. Paired T Test or One Way ANVOA

Hi, I'm trying to analyse data from a small sample size (10 people) but not sure which test I should use. my data is based on having asked the...

• Replies: 1
• Views: 866
04-02-2014, 03:41 PM

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