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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: 67,011
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: 197,244
07-16-2014, 11:01 AM
1. ### Correlation of two factors, which way is better?

Hello, It's my first post here, I'm glad to be here. I'm writting a thesis about real estate markets in Poland in last few years, mainly about 5...

• Replies: 0
• Views: 1,060
03-09-2014, 12:20 PM
2. ### Does normality improve a multivariate hierarchical cluster analysis?

Hi, I applied transformations (normalization) and standardization to multiple variables before applying a hierarchical cluster analysis, because...

• Replies: 0
• Views: 1,884
08-08-2011, 12:02 PM
3. ### ECG Database Analysis

Hello, I'm analysing a set of 400 ECG signals (each one of a duration of 30 sec). I want to get the mean signal of all my signals but I don't...

• Replies: 1
• Views: 1,262
05-29-2015, 12:26 PM
4. ### Help needed in experimental design and stats test for an intertidal marsh

Hi All, I need some advice regarding experimental design and stats test selection. I have an area of intertidal marsh that we replanted following...

• Replies: 1
• Views: 1,968
10-26-2010, 06:50 PM
5. ### Interpreting Results in Primer

My frequency distribution of R varies from <-0.07 99% <0.10 at 0.1% but the R (Global) is equal 0.484 at 0.1%. what results to consider?

• Replies: 0
• Views: 2,318
09-03-2013, 05:37 AM
6. ### Wins > 50% for everyone in a pool of players

Is it possible for every single player in a pool of players to end up with a > 50% win/loss ratio. Providing that the game being played can have...

• Replies: 2
• Views: 1,371
04-08-2015, 06:27 PM
7. ### analysis of classic Battleship game

Hi, This must be a classic statistical problem, but I suspect I am just not using the standard name for the problem. I would like to find a...

• Replies: 1
• Views: 3,256
01-07-2009, 12:18 AM
8. ### comparing % rates of increase

New Member asking question. Revenue increases 111%. Expenses increase 79%. Can I say that revenue increased 140% faster (111/79=140) than...

• Replies: 0
• Views: 3,527
03-26-2008, 07:03 PM
9. ### Comparing correlation coefficients

Hi:) I am new to the forum nut I hope to find help here :) So here is the situation: I have a dataset with experimental values of Y containing...

• Replies: 3
• Views: 2,076
09-07-2013, 05:06 AM
10. ### Need explanation on Ordinal Logistics Regression

Could somebody explain --in as plain English as possible-- how to use and interpret the results from running Ordinal Logistics Regression in SPSS....

• Replies: 0
• Views: 3,378
04-30-2012, 02:41 AM
11. ### Nonparametric multiple linear regression with SPSS

Is there a way to conduct nonparametric multiple regression analysis using SPSS? If yes, can you provide some explanations on this regard. I...

• Replies: 3
• Views: 35,738
04-30-2012, 02:25 AM
12. ### satellite data precision

Hi all, I’m looking at some satellite data files. They are profiles of chemical atmospheric components and each profile has an associate estimate...

• Replies: 0
• Views: 2,347
ale
03-31-2011, 07:47 PM
13. ### Analysis of Variance with replication and multiple comparisons

Hi: Could someone please help me with the following problem? I am performing an Analysis of Variance with replication, balanced design but it is...

• Replies: 1
• Views: 2,319
04-26-2011, 07:30 AM
14. ### Binomial Distribution confusion

Hi, I'm currently confused on a question and don't quite understand how to solve it. The question is Suppose 75% of all households with telephone...

• Replies: 1
• Views: 1,382
02-14-2017, 03:39 AM
15. ### Log-rank or Wilcoxon test

I want to compare two survival curves (cumulative) and I’m not completely sure which of the two tests is most appropriated log-rank or wilcoxon test....

• Replies: 2
• Views: 2,290
09-26-2013, 07:58 AM
16. ### Kolmogorov smirnov test for goodness of fit

Hi, I urgently need your advise! I would need to know if I can use the Kolmogorov smirnov test for goodness of fit of distributions different...

• Replies: 3
• Views: 6,130
08-03-2009, 04:34 PM
17. ### Help Reated Measure design!

Hi! I have a database with different speech features (% of pauses, pauses duration and so on) extracted from the vocal responses to two tasks: ...

• Replies: 2
• Views: 2,465
03-19-2010, 07:58 AM
18. ### classification

Hi, I have the following problem: I have averaged the mean of pauses duration (which is a speech feature) across 4 picture that my participants...

• Replies: 2
• Views: 2,459
05-27-2010, 04:15 AM
19. ### Interjudge agreement

Hi All, I have the following problem. I asked 3 judges to rate the fragmentation of speech of some subjects in a study. I now need a measure...

• Replies: 2
• Views: 3,709
11-10-2010, 05:36 AM
20. ### Repeated measure mixed models HELP PLEASE!!

Hi to everyone! I am new to the forum! Very briefly, my problem is as follows: I started a research on videogame exposure and morality. I...

• Replies: 1
• Views: 1,340
04-24-2012, 03:18 PM
21. ### Validating and comparing models

Hello all I am confused about how to get a measure of how well a model fits data. I have a set of failure time observations for a component....

• Replies: 0
• Views: 1,490
05-30-2009, 11:07 AM
22. ### Estimate of travelling time

Hello! I'm a Norwegian engineer, now located in Tunisia. Everyday i take a sort of taxi, called collective taxi to my Arabic lessons in the neighbor...

• Replies: 12
• Views: 4,190
09-30-2010, 12:55 AM
23. ### How to anticipate moderating effects

Hi. I have a large dataset and based on some or all of the variables in that dataset, I want to create a regression model using SPSS. However, it...

• Replies: 1
• Views: 1,543
05-11-2012, 12:54 PM
24. ### Mean comparison

Hi everyone. I am sorry if this is too simple question, but I still cant deal with it. I have a set of data for period of time. I know that this...

• Replies: 3
• Views: 3,012
12-13-2016, 10:27 AM
25. ### How much high/low is the variance if a variable?

Hello everyone, How can you determine if a variable has a high variance or not? The variance, the standard deviation and the coefficient of...

• Replies: 1
• Views: 1,086
07-17-2014, 11:06 AM
26. ### Test the difference between the variance of two proportions

Hello everyone, How can I test the difference between the variance of two proportions? Best, Ale

• Replies: 3
• Views: 1,630
07-17-2014, 02:54 PM
27. ### Help with the statistics solving

Violations 0 0 1 2 3 4 5 >5 Fine A\$1000 0 0 10 10 10 20 50 (Please note from the...

• Replies: 0
• Views: 1,484
05-13-2014, 01:51 AM
28. ### Multilevel models help

I am in a situation where I have an outcome variable (dichotomous) that has been measured in different centers (group variable). Here it is a...

• Replies: 3
• Views: 1,354
04-10-2013, 04:07 PM
29. ### building confidence interval for a simulated estimate

Hi, the context : I'm using a basic logistic regression model on my data, and the values of interest are the basic estimates : Beta regression...

• Replies: 20
• Views: 3,959
06-06-2013, 10:46 AM
30. ### homoscedasticity assumption in linear regression

If we have a usual linear regression model Y = beta0 + beta1*X + e If we say that e is independent of X, does this automatically imply that var(e)...

• Replies: 3
• Views: 1,313
02-20-2015, 06:23 PM
31. ### creating a categorical variable with a continuous variable

Hi, I have a year of birth variable that I'm regrouping into categories (for example 1970-1974 is coded as 1, 1975-1979 is coded as 2, etc). I...

• Replies: 1
• Views: 1,790
12-02-2016, 12:26 PM
32. ### comparing linear vs logistic regression for a simple model with binary variables

Let's suppose Y and X are two binary variables. If I do a linear regression model Y=B0 + B1*X and estimate the predicted values for Y, I will get the...

• Replies: 4
• Views: 2,402
02-06-2017, 06:28 PM
33. ### Question about conditional odds ratio

I have a question about the definition of a conditional odds ratio (COR). Let's assume a very simple scenario of three binary variables Y,X and Z....

• Replies: 3
• Views: 247
10-03-2017, 12:05 PM
34. ### r squared and t stats

I am running regression analysis of panel data examining whether there exists a relationship between aid and investment as well as between aid and...

• Replies: 2
• Views: 3,903
04-27-2006, 11:42 AM
35. ### Very basic question regarding multiplicity

Hi all, I'm hoping you can give me some homework help so I can better understand this question. I was asked, given a 0.05 significance level, how...

• Replies: 0
• Views: 985
03-25-2015, 06:28 PM
36. ### Not sure what topic this question falls under

Among 30 children (aged five to six years) living in a particular neighborhood, the standard deviation of diastolic blood pressure is 7.9mm Hg and...

• Replies: 2
• Views: 1,811
10-18-2011, 01:20 AM
37. ### Differentiating between different distributions

In my last 3 statistics classes I have learned about several different kinds of distributions: the binomial probability distribution the normal...

• Replies: 0
• Views: 1,982
10-18-2011, 01:06 PM
38. ### Quick questions about probability and expected value

If 22 percent of all sodas dispensed by a vending machine overflow their cups, then : a) What is the probability that exactly five out of the ten...

• Replies: 1
• Views: 1,936
BGM
11-01-2011, 11:28 PM
39. ### Couple conceptual word problems

1. A survery of college students was taken to determine what percentage of students would be voting in the upcoming elections. The results were...

• Replies: 3
• Views: 2,900
10-30-2011, 02:23 PM
40. ### Completely Stumped by Impossible Stat Question

The weight of ripe pumpkins grown at Mr. Mike's farm are normally distributed with a mean of 8 pounds and a standard deviation of 2 pounds. The...

• Replies: 2
• Views: 3,021
10-30-2011, 01:24 AM
41. ### Bonferroni test - ANOVA post-hoc - Formula for the standard error

Hi all, Was doing ANOVA (1 and 2 way) and messed with post-hoc with Bonferroni correction. As I understand formula for the test statistic is ...

• Replies: 4
• Views: 17,544
06-09-2010, 07:39 PM
42. ### Nested sampling: posterior samples randomly scattered in the area under L(x)? Why?

Hi All, I am new to this forum, so I hope you will bear with me (and forgive mistakes etc:) I am reading on nested samples (got into it reading...

• Replies: 0
• Views: 1,284
10-04-2013, 10:20 AM
43. ### Panel data correlation

In a panel dataset of multiple years and multiple countries, what is best practice for running correlations among variables? I know that pooling by...

• Replies: 0
• Views: 1,011
03-30-2015, 09:26 AM
44. ### Non-parametric method: confidence interval for the median (Wilcoxon)

hello.I have a subject about Non-parametric method: confidence interval for the median (Wilcoxon) but i can't find any usefull information.i would...

• Replies: 0
• Views: 955
06-17-2014, 04:15 AM
45. ### High Variance

I am running checks for parametric assumptions, and while my data is approximately normally distributed, the variances of some of the variables is...

• Replies: 0
• Views: 2,426
01-30-2011, 07:34 AM
46. ### Sten Scores

Hi can anyone help me work out sten scores in spss Is it just the z score x 2 + 5.5 Thanks Alex

• Replies: 0
• Views: 2,497
08-09-2011, 01:17 PM
47. ### Exercise in Stationarity

Hello everyone, I am Alexandra I am completely new to the forum and have no IDEA about statistics. My boyfriend is at his final semester of his...

• Replies: 7
• Views: 1,398
02-23-2014, 11:47 AM
48. ### two continuous & two categorical variables: how to compare

Dear all, I have the following biological data: 1st variable (continuous, normally distributed): concentration of a hormone in blood 2nd...

• Replies: 3
• Views: 1,408
08-02-2016, 09:21 AM
49. ### Regression analysis data distribution

Hello colleagues, Could you please help me understand the following? I am making a linear regression analysis and my dependent variable is...

• Replies: 8
• Views: 2,104
10-19-2013, 04:00 AM
50. ### LOF : Local Outlier Factor

I have a few questions about Lof : http://www.dbs.ifi.lmu.de/Publikationen/Papers/LOF.pdf 1. I don't understand of k-distance(o) inside...

• Replies: 0
• Views: 1,556
06-20-2016, 08:38 AM
51. ### Need help choosing an appropriate test.

I have two sets of frequencies, observed and expected. I know I could do a Chi-squared test to determine if the frequency distributions match, but...

• Replies: 3
• Views: 1,071
06-04-2013, 05:20 PM
52. ### Pearson correlation coefficient P-value statistic?

Original question: How was the P-value for the Pearson correlation coefficient calculated? What is the number of degrees of freedom of the test...

• Replies: 1
• Views: 9,517
12-19-2010, 01:55 PM
53. ### When/ when not to use Z scores to compare data

In comparing 2 groups of numbers, could you give me any examples of when would it be (1) beneficial (2) when it would not be beneficial to first...

• Replies: 4
• Views: 8,401
12-12-2010, 06:10 PM
54. ### What does an outlier in a stem and leaf plot look like?

I have to analyze some displays (e.g. stem and leaf plot, histogram) I have generated for a homework questions from a group of numbers. I have...

• Replies: 6
• Views: 43,655
12-12-2010, 04:06 PM
55. ### Determining whether a study is randomized

I would appreciate any tips on how to tell whether a study is randomized or not.

• Replies: 1
• Views: 2,429
12-19-2010, 06:12 AM

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