1. Announcement:
Search functionality giving errors
05-07-2017
Views:
3,008
Page 1 of 292 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 51 101 ... Last
Threads 1 to 60 of 17473

# 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: 190,418
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: 63,619
09-30-2005, 09:44 AM
1. ### How is this calculated

On page 128 there is a table showing how much 'life misery' can be reduced by eliminating different issues - such as poverty and mental illness. But...

• Replies: 1
• Views: 120
Yesterday, 07:54 AM
2. ### Post-hoc power analysis for a Welch ANOVA and also a Kruskal-Wallis test.

I planned to analyse some data with several ANOVAs (I have many different dependent variables), but much of the data violates the ANOVA assumptions,...

• Replies: 7
• Views: 232
Yesterday, 05:52 AM
3. ### Testing assymetry between 2 models with F-test

Hello, I would like to know whether it is acceptable to use a general linear F-test, supposed to compare two models (a full model and a restricted...

• Replies: 1
• Views: 104
Yesterday, 03:08 AM
4. ### Species abundance statistical comparison assistance

Hi, I am new to statistics and needing to apply a relevant statistical test to the following question: Is the presence/abundance of species X...

• Replies: 2
• Views: 158
08-17-2017, 06:15 AM
5. ### Name Research: Between and Within Subjects

First time poster here, trying to remember stats from grad school 10 years ago. I'm running a naming survey with 20 names and 1600 respondents. I...

• Replies: 1
• Views: 133
08-16-2017, 05:11 PM
6. ### Survival Analysis with two types of event

Hi, guys! I'm looking for an example of kaplan meier with two different types of event, e.g. tumor progression or death as outcomes. Somebody knows...

• Replies: 2
• Views: 111
08-16-2017, 02:15 PM
7. ### Statistical test for ranked data among 3 groups - ANOVA or Kruskal-Wallis?

Hi all, I've read several books but I am not sure which statistical test to apply and whether my thinking is correct so I would greatly...

• Replies: 1
• Views: 115
08-16-2017, 04:32 AM
8. ### Freidman test with missing values?

I have a set of data at four time points, but some subjects only two out of the four time points. Can I still use Friedman test for this in SPSS?

• Replies: 1
• Views: 96
08-16-2017, 04:19 AM
9. ### Relative Efficiency

Consider the following equation: T_i = A_i + Z_i * B_i,i=1,2...,6. Suppose for all i(i=1,2,...,6) data generation of A_i and B_i are exactly...

• Replies: 0
• Views: 67
08-16-2017, 12:03 AM
10. ### Test for ranked data among 3 different groups - ANOVA or Kruskal Wallis in SPSS?

Hi all, I have read several books but I am not sure if my thinking is correct and would greatly appreciate if someone could help me. I...

• Replies: 0
• Views: 17
08-15-2017, 11:34 AM
11. ### Mixed models: Calculating ICC for model with a random intercept and a random slope

Hello All, I have a question about how to calculate an intraclass correlation coefficient in a mixed model that has both a random intercept and a...

• Replies: 8
• Views: 7,189
08-14-2017, 06:26 PM
12. ### Rolling average of an average

I have egg count data from a series of insect traps collected weekly. Each week I work out the average of the egg counts for 40 traps. Can I use...

• Replies: 1
• Views: 201
08-10-2017, 08:33 AM
13. ### Area under the curve after 10-fold cross validation

Hi everyone, After performing a 10-fold cross validation, I now have area under the curve (AUC) for each of the 10 test subsets. I calculated the...

• Replies: 5
• Views: 229
08-10-2017, 04:28 AM
14. ### Variability within the group

Hello, I apologize if my question seems basic. I have the following data : a=c(107,135,122,67,65,53,19,32) b=c(35.5,26,9,4.5,5.33,9.83,0,1)...

• Replies: 4
• Views: 189
08-10-2017, 12:49 AM
15. ### Explained Variance in Laymen's terms

Hi everyone, Say I have a correlation between two judges of .6, so 36% of explained variance. Is it correct to say: if you know the scores of...

• Replies: 0
• Views: 83
08-09-2017, 04:20 AM
16. ### Tied Ranks Spearman Correlation - Issue with Excel

Dear all, I am using Excel for my (fairly simple) data set. I first used the RANK-function to rate the data and then the CORREL-formula to...

• Replies: 0
• Views: 154
08-07-2017, 09:01 PM
17. ### Interaction in simple Repeated Measures Anova

Dear all, I am currently struggling with my masters-thesis on the subject of control variables or covariates in a repeated measures analysis. I...

• Replies: 0
• Views: 117
08-07-2017, 03:40 PM
18. ### What test to run?

I was hoping someone could help with this problem. It seems like it should be simple but I cannot figure it out. I have a population with 2 different...

• Replies: 1
• Views: 181
08-06-2017, 02:57 PM
19. ### Conditional Mean

Given a normal distributed random variable X ~ N(0, 1). Formula for E(X| X> 0) E(X| X> 1) E(X| X> 2) ... ? Thanks Consuli

• Replies: 3
• Views: 277
08-01-2017, 01:08 PM
20. ### Missing Data

Hi All, I am running a number of mulitple regression analyses and wanted to know how to use Little's MCAR test to assess missing data. ...

• Replies: 1
• Views: 170
07-31-2017, 10:41 AM
21. ### Help with research statistics analysis (MANOVA?)

Hi all, I think this is a fairly straightforward question but I am not experienced in this sort of work so I'm seeking help! I am doing...

• Replies: 0
• Views: 197
07-28-2017, 03:06 PM
22. ### Testing for equality of estimated coefficients between two models

Good morning, I need an information as I'm estimating two models by OLS : - The first one estimates a standard linear model Y = a + B.X +...

• Replies: 1
• Views: 206
07-28-2017, 01:25 PM
23. ### Question about degrees of freedom in an independent sample t-test

I've been asked the following question by a scientist who is not a statistician: Suppose we take a sample \$x_1,…,x_n\$ from a population that we can...

• Replies: 1
• Views: 376
07-25-2017, 03:41 PM
24. ### Chi Square or T Tests for Likert Scale Type Survey

So I have a 4 point likert-type scale with approximately 20 questions. I have categorized each item to be either agree or disagree. I mainly did this...

• Replies: 1
• Views: 308
07-24-2017, 10:03 AM
25. ### Checking significance of bias.

In a new design, estimator seems to be biased but efficient than the existing design. Now I want to check whether the bias of the estimator based on...

• Replies: 3
• Views: 238
07-24-2017, 09:53 AM
26. ### Use of Secondary data

I have two datasets A and B. Both datasets are household surveys for a country where first administrative tier is province and second is district....

• Replies: 0
• Views: 153
07-24-2017, 09:23 AM
27. ### Stats test method

Question 1 Sample 1(Age) 32,28,36,42,29,30,31,35,26 Sample 2(Age) 22,18,22,25,24,19,24,29,36 It is thought that sample 1 is older in this...

• Replies: 1
• Views: 216
07-23-2017, 11:18 AM
28. ### How to do calculate test statistic (x^2) in spss or any online calculator?

How to do calculate test statistic (x^2) in spss or any online calculator? Given 2 groups, expected and actual.

• Replies: 1
• Views: 245
07-20-2017, 11:32 AM
29. ### stuck with this problem!!!! need help

The minimum force required to break a particular type of cable is normally distributed with mean 12,432 and standard deviation 25. A random sample of...

• Replies: 4
• Views: 2,966
07-18-2017, 10:51 AM
30. ### Normal Distribution Overlap

Is there a way that I can calculate the probability that a data point would fall in the region where two normal distributions with different means...

• Replies: 17
• Views: 24,569
07-18-2017, 02:24 AM
31. ### interesting sampling question

I have two samples of the same population and wish to reduce the sample sizes, but maintain the same ratio of precision produced in the original...

• Replies: 6
• Views: 367
07-17-2017, 02:04 PM
32. ### Weekly Sales - statistical analysis

I need to analyze sales on hourly level, and compare hourly sales of one day with same day in last 10 weeks. Following is the data set: -Day -Hour...

• Replies: 0
• Views: 197
07-17-2017, 12:42 PM
33. ### Help with data analysis of 7-Point Likert Scale needed

Dear all, I'm investigating perceptions of effective leadership of Germans and Indians. Part of the questionnaire assessed the attitude towards...

• Replies: 0
• Views: 258
07-17-2017, 06:57 AM
34. ### Cronbachs Alpha- Quick question, urgent help needed

Hi guys, hope you are all doing fine. I have an exam on monday and need to know how to calculate Cronbach's alpha. I know that you have to use...

• Replies: 1
• Views: 352
07-15-2017, 02:22 PM
35. ### ITU-R recommendation P.530; staistical data; basic interpretation needed!

I am trying to translate a statistical database from ITU-R (the administration that sets out recommendations for the engineering of wireless systems)...

• Replies: 0
• Views: 230
07-15-2017, 01:51 PM
36. ### Urgent stats help needed for medical research project

Hi everyone!! URGENT HELP NEEDED!! Thanks for trying to help - I'm trying to submit a research grant and there are a few questions about the...

• Replies: 5
• Views: 406
07-15-2017, 02:15 AM
37. ### Delphi assessment..., which tests?!

Hi all, I've recently undertaking a Delphi workshop in an attempt to establish an expert opinion upon the importance of a series of behaviours to...

• Replies: 0
• Views: 264
07-14-2017, 04:07 PM
38. ### Statistical test for comparing percentage not mean

Hi, I am wondering what test should I use to compare two percentage value from two different observations. Let's say I have a damage of crop 15%...

• Replies: 2
• Views: 294
07-14-2017, 09:19 AM
39. ### Intraclass Correlation Coefficient: Single Measures or Average Measures

For our research we use Intraclass correlations (ICC's), but I can't figure out wether I need to use the Single Measures-value or the Average...

• Replies: 0
• Views: 262
07-14-2017, 04:31 AM
40. ### Test sensitivity for a given category or category sensitivity?

Hello everybody, I want to study several parameters (i.e. sensitivity, specificity, precision and F1-score) of a given test. To do so, I'm...

• Replies: 2
• Views: 226
07-13-2017, 11:37 AM
41. ### Combined p-value of ANOVA tests and its post hoc tests

Hi all! I have conducted a one way ANOVA test of the impact of 3 different shoes on oxygen consumption of a runner and got a P-value of 0.12 (for...

• Replies: 1
• Views: 271
07-11-2017, 06:55 AM
42. ### Mean = 27.6, lately 24, is there a signifcant difference?

Hello! I am having a major brain issues today, and have a question that I believe many people will be able to help me with. I have a task I...

• Replies: 2
• Views: 328
07-10-2017, 03:38 PM

Hi everyone. I am a new member of this great forum. I have some question sheets of my exam and I can't answer them. My exam will be taken on...

• Replies: 1
• Views: 263
07-09-2017, 04:54 PM
44. ### Factorial Within-Subjects Repeated Measures ANOVA... Sample Size?!

Apologies for the title, it's a bit of a mouthful...! I am attempting to calculate the minimum sample size to achieve 80% power, with alpha of...

• Replies: 1
• Views: 359
07-08-2017, 08:10 PM
45. ### Conditional Probability

Hi! If X ~ Unif(0,100) and Y|X ~ Poisson(mX) where m is some scalar Then how can I find the distribution of Y? Thank you!!!!

• Replies: 1
• Views: 286
07-07-2017, 12:14 PM
46. ### Wls regression

How do we compute the weights in WLS regression? Step by step explanation would be really helpful. After, we compute the weight then how to do we...

• Replies: 1
• Views: 307
07-07-2017, 12:13 PM
47. ### degrees of freedom in a survey

Removed question........

• Replies: 1
• Views: 252
07-07-2017, 12:08 PM

In a class, Budi's score is greater than Doni's. The sum of Adi's and Doni's scores is greater than the sum of Budi's and Coki's scores. Meanwhile,...

• Replies: 2
• Views: 352
07-05-2017, 08:15 PM
49. ### Measure Volatility or Stability Of Lists of Floating Point Numbers

Hi, Wonder if anyone can help. I have a set of lists of numbers, around 300 lists in the set, each list of around 200 numbers. What I wish to...

• Replies: 2
• Views: 248
07-04-2017, 03:55 AM
50. ### This Thread has easy example dataset! :D Help choose the right test please!

We're trying to test whether there is a difference in length of visit (in minutes) between our original website and: Revamped Website #1 Revamped...

• Replies: 1
• Views: 241
07-03-2017, 04:07 PM
51. ### Best alternative test for F test and t test for two independent sample population?

Hi, We use F-test and T- test for our research purposes. i would like to know more effective and efficient hypothesis test methods for validation...

• Replies: 1
• Views: 243
07-03-2017, 03:43 PM
52. ### comparing three sets

Dear all, I have three sets, A (495 elements), B (1130 elements) and C (812 elements). The elements are biological entities bound by a...

• Replies: 1
• Views: 234
07-03-2017, 01:45 PM
53. ### Significance test for gender differences in groups

Hi everyone, I have 5 different treatments and want to test whether there are statistically significant more women/ men in one treatment than the...

• Replies: 3
• Views: 407
07-01-2017, 09:46 AM

Page 1 of 292 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 51 101 ... Last

Use this control to limit the display of threads to those newer than the specified time frame.

Allows you to choose the data by which the thread list will be sorted.

Note: when sorting by date, 'descending order' will show the newest results first.