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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: 196,934
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: 66,847
09-30-2005, 09:44 AM
1. ### Comparing Likert scales of different lengths

Hi there talkstats experts. For my thesis I am doing research about listener's attitudes towards 4 different Dutch accents. Next to that I also do...

• Replies: 1
• Views: 2,271
01-17-2013, 05:41 AM
2. ### Percentage of data points in distribution

Hello, I have a sample of data for which I have figured out that the population mean for the height of US 12-year-old children is μ = 150 cm with σ =...

• Replies: 1
• Views: 1,405
01-16-2013, 11:07 PM
3. ### Standard Deviation not Equal to Standard Error

Question: If the standard deviation of a particular sample with size N is not equal to the standard error for samples of the same size. Can you...

• Replies: 1
• Views: 2,434
01-16-2013, 09:58 PM
4. ### Help me!

What is the numerical value of the standard deviation of the following sample data? 45, 26, 36, 34, 24, and 29? Round your answer to the nearest...

• Replies: 3
• Views: 1,757
01-16-2013, 04:01 PM
5. ### Can Process Capability Be Calculated Using Unilateral Tolerance ?

Hello all. This is my first post, so please be gentle. First off, I am not a statistician in any way shape or form, however............ I am in...

• Replies: 0
• Views: 2,146
01-16-2013, 02:59 PM
6. ### Statistical hypothesis testing

I was given this problem: If X is not normally distrubuted, but Y= sqrt(X) is: which hypothesetes tests are possible and explain why: H0:...

• Replies: 1
• Views: 1,180
BGM
01-16-2013, 10:49 AM
7. ### Multicollinearity with categorial variable

Hey everyone, I am working on my statistical assignment for my regression class and I have encountered a problem. I have the dataset from library...

• Replies: 0
• Views: 1,480
01-16-2013, 09:30 AM
8. ### Comparing two or more groups used different criteria

Hy, In my work, I have to compare groups of users and see if there is a significant difference between them. So, I use parametric (Student, Anova)...

• Replies: 4
• Views: 1,681
01-16-2013, 08:58 AM
9. ### How robust is Pearson's Correlation to Normality violations?

Hi Guys, I can't seem to find a definitive answer to this question: can one run a Pearson's correlation on data that is not normal (but has no...

• Replies: 0
• Views: 3,542
01-16-2013, 05:25 AM
10. ### Help needed interpreting phi - desperate!

Hey everyone, I am in the process of finishing my master's thesis (strategic public relations). My thesis focuses on finding out what type of tweets...

• Replies: 1
• Views: 2,259
01-16-2013, 04:01 AM
11. ### Root mean square error

Hi Guys, I am confused with the root mean square error of a regression. Is it actually the square root of the variance of the residuals of a...

• Replies: 0
• Views: 647
01-16-2013, 03:28 AM
12. ### Effect size for Nemenyi test

Hello, I have been trying to find how to calculate the effect size for Nemenyi test (which is a nonparametric Tukey-type multiple comparisons). If...

• Replies: 0
• Views: 1,455
01-15-2013, 07:38 PM
13. ### Prediction with Residuals

Hi I am a very beginner so sorry for the very simple questions. I have first a very general question regarding the linear regression. This...

• Replies: 0
• Views: 1,016
01-15-2013, 06:57 PM
14. ### Prediction using Time Series Techniques

Hello all, I need some suggestion regarding Prediction using Time series techniques. I am using time series techniques to predict the future...

• Replies: 5
• Views: 1,755
01-15-2013, 12:46 PM
15. ### How to calculate this question, probability ?

hello in my last exam statistics there was this question: A certain brand of batteries has a lifetime that has a normal distribution with a...

• Replies: 1
• Views: 3,004
01-15-2013, 11:30 AM
16. ### Spread of ordinal data

Hi, I have used a 5 point likert scale (agree to disagree) in a survey and found that there was a central tendency bias where respondents scored a...

• Replies: 4
• Views: 1,512
01-15-2013, 10:48 AM
17. ### Is it possible to calculate the F-statistic with means, SDs and sample sizes?

Let's say we have two groups. Group A: mean = 5.5, sd = 1.2, n = 40 Group B: mean = 6.2, sd = .8, n = 45 With this information only, is it...

• Replies: 2
• Views: 1,641
01-15-2013, 03:31 AM
18. ### Parametric tests on percentage change data?

Hi, I've been searching around recently to check if I am able to use one way ANOVA (parametric tests) on percentage change data? The data is from...

• Replies: 1
• Views: 2,885
01-15-2013, 02:05 AM
19. ### Categorical Data and Cluster Analysis

Hi All, New to the forum but thought it might be useful given how long it takes me to find something out via books and the internet! No substitute...

• Replies: 2
• Views: 2,154
01-15-2013, 01:56 AM
20. ### Trend beta coefficients of ordinal predictor

I have made a few regression models in Stata using commands like: "regress continuousvariable i.ordinalvariable ..." I'd like a p-value for the...

• Replies: 0
• Views: 1,289
01-14-2013, 11:11 PM
21. ### Calculate Cross-Sell Potential

I'm having difficulty predicting cross-sell items... Given a 2 column dataset of order numbers and product SKUs, which test should I run to...

• Replies: 3
• Views: 2,208
01-14-2013, 07:57 PM
22. ### Retail Formula to Compare Sales (simple?)

For a thrift store, where all of product is essentially free... is there a way to tell me which sale was more successful? Sale 1 - a 50% OFF sale...

• Replies: 3
• Views: 1,506
01-14-2013, 05:44 PM
23. ### charectristics of a data set for Standardizing

Hi, for standardizing a data set or (x-mean)/variance we are assuming a Gaussian distribution for the data. What should we do to know that this...

• Replies: 2
• Views: 1,115
01-14-2013, 05:36 PM
24. ### Most wins over time

Hey, I am not very good at stats, but I have a question. Statistically speaking, if you could create a draw, with whatever amount of tickets...

• Replies: 7
• Views: 1,917
01-13-2013, 07:14 PM
25. ### t-test critical value approach both sigma and S unknown

I apologise in advance if a similar question has been answered before but both on google and the forums I have had no luck due to the search terms....

• Replies: 3
• Views: 4,859
01-13-2013, 06:30 PM
26. ### ANOVA with percentages

Hello -- I'm looking for some guidance on how to make my percentage data appropriate for ANOVA. Here is what I have: The dependent variable is a...

• Replies: 10
• Views: 12,026
01-13-2013, 02:20 PM
27. ### Help with writing null/alternative hypothesis

I need to assess the efficacy of the drug treatment by comparison with the placebo treated (basically what is better) by t-test unparied but I cannot...

• Replies: 4
• Views: 1,896
01-13-2013, 01:43 PM
28. ### Covariance of Multinomial Trials

The problem is to find the covariance of N_i and N_j where N_1, N_2,...,N_r are multinomial random variables. It is known that the marginal...

• Replies: 1
• Views: 10,240
01-13-2013, 02:20 AM
29. ### Help with concordance correlation

I have a clinical trail with 60 patients, suffering from a brain injury. I need to evaluate the concordance between the results of the study, as...

• Replies: 1
• Views: 1,385
01-12-2013, 05:55 PM
30. ### wilcoxon signed-rank test to compare 2 pseudo-randomized distributions?

Hello I need help to find the good statistic to use to compare two distributions of data coming from pseudo randomized trials. I have recorded...

• Replies: 1
• Views: 2,113
01-12-2013, 04:01 PM
31. ### Normalizing standard deviation

Greetings! This is a simple question, I think, but one that I am too rusty now to deduce a clear answer to. If I have a mean (m) and associated...

• Replies: 3
• Views: 25,040
01-11-2013, 09:34 PM
32. ### how to add quantity information to boxplot

Hello I am using boxplots to show the distribution of some data. However, some comments says the boxplot can not show the concentration quantity...

• Replies: 1
• Views: 2,240
01-11-2013, 09:26 PM
33. ### Gentrification Data

Hello, I am developing a masters thesis which will attempt to utilize census tract data to assess the occurrence of gentrification in Washington,...

• Replies: 0
• Views: 1,244
01-11-2013, 07:31 PM
34. ### Type II Error Rate

Any help greatly appreciated!I can't seem to figure out how to obtain the probability of type 2 errors from this question. A researcher is...

• Replies: 2
• Views: 1,053
01-11-2013, 05:14 PM
35. ### Likert pre-post test for 3 groups

Hi there, I have data for a within-subjects study where each subject was asked to perform 3 tasks (in a randomized order to prevent learning...

• Replies: 0
• Views: 1,460
01-11-2013, 02:27 PM
36. ### Probability in cups and balls experiment.

Hi, I have a problem which can be described with the following analogy: If two cups containing an amount of balls are held against each other...

• Replies: 4
• Views: 3,544
01-11-2013, 02:18 PM
37. ### Significance when self-selected participation is low

Suppose we have 1000 people. Of those 1000, 4 men and 2 women express interest in option A. Note that each one of the 1000 does not have to render...

• Replies: 6
• Views: 1,642
01-10-2013, 07:00 PM
38. ### How to do Regression with many replicates of y at each level of x?

Hi follows, I have data that looks as follows: X, y1, y2, y3, y4 0, 54.241, 127.728, 127.73802, ...

• Replies: 2
• Views: 2,408
01-10-2013, 10:47 AM
39. ### Process averages with grouped trials

Hi all, I've come across a problem recently that I'm not even sure is a statistical one, but here goes! I have 50 different processes, each of...

• Replies: 0
• Views: 898
01-10-2013, 03:17 AM
40. ### Not sure where to begin...

I'm planning a study in which I will survey about 300 people about their attitude towards a given subject area. They will answer questions on a...

• Replies: 5
• Views: 2,193
01-09-2013, 07:31 PM
41. ### repeated measures anova, post hoc testing

Hi there, I have a 2x4 fully repeated measures design in which participants had to correctly state whether a target was absent or present in a...

• Replies: 1
• Views: 2,566
01-09-2013, 06:24 PM
42. ### interpreting a model after mean centering

hello, I have to choose the best way to model the relationship between years' experience and time taken to master a new skill. The curve seems to...

• Replies: 8
• Views: 2,409
01-09-2013, 01:26 PM
43. ### Time Series Help: How does a joint distribution function describe a time series?

I hope that someone is able to help me - I have taken several 500-level statistics courses at my current university, but for some reason some of this...

• Replies: 2
• Views: 2,662
01-09-2013, 10:50 AM
44. ### 2 way ANOVA? or repeated measures ANOVA?

Hi, sorry if this is really obvious, but I have this dataset i'm meant to analyse using prism, but I'm not sure i've done the right test? I'm...

• Replies: 3
• Views: 1,986
01-08-2013, 07:02 PM
45. ### Standard deviation

Q1)How: Standard deviation usually measuring the spread of the observations? Q2)Why:If we set for the mean =0 and standard deviation=1 and if I...

• Replies: 5
• Views: 1,803
01-08-2013, 05:11 PM
46. ### Weights in equation

Hey guys. I've been working on some data and I've come up with an idea that I don't know how to calculate (since I'm not really a mathematician)....

• Replies: 0
• Views: 1,361
01-08-2013, 12:14 PM
47. ### Check moderation using ANCOVA

I have searched online and still couldnt find an exact way to check whether there is moderation by a continuous covariant between the DV and a...

• Replies: 0
• Views: 3,306
01-07-2013, 11:42 PM
48. ### simple way to calculate error mean square

I have data from many experiments, I want to calculate the coefficient of variation for each experiment i.e. error mean square/grand mean, is there a...

• Replies: 0
• Views: 1,242
01-07-2013, 07:14 PM
49. ### Meta-analysis using unpublished randomised trials

Meta-analysis using unpublished randomised trials Hi, I am intersted to do a meta-analysis, have data set from about 50 experiments, mostly...

• Replies: 1
• Views: 1,486
01-07-2013, 04:40 PM

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