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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: 200,228
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: 68,481
09-30-2005, 09:44 AM
1. ### 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: 334
08-16-2017, 05:11 PM
2. ### 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: 388
08-16-2017, 02:15 PM
3. ### 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: 331
08-16-2017, 04:32 AM
4. ### 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: 375
08-16-2017, 04:19 AM
5. ### 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: 264
08-16-2017, 12:03 AM
6. ### 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: 125
08-15-2017, 11:34 AM
7. ### 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: 8,761
08-14-2017, 06:26 PM
8. ### 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: 397
08-10-2017, 08:33 AM
9. ### 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: 619
08-10-2017, 04:28 AM
10. ### 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: 601
08-10-2017, 12:49 AM
11. ### 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: 268
08-09-2017, 04:20 AM
12. ### 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: 883
08-07-2017, 09:01 PM
13. ### 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: 407
08-07-2017, 03:40 PM
14. ### 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: 536
08-06-2017, 02:57 PM
15. ### 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: 414
08-01-2017, 01:08 PM
16. ### 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: 282
07-31-2017, 10:41 AM
17. ### 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: 541
07-28-2017, 03:06 PM
18. ### 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: 289
07-28-2017, 01:25 PM
19. ### 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: 537
07-25-2017, 03:41 PM
20. ### 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: 902
07-24-2017, 10:03 AM
21. ### 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: 712
07-24-2017, 09:53 AM
22. ### 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: 525
07-24-2017, 09:23 AM
23. ### 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: 1,043
07-23-2017, 11:18 AM
24. ### 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: 399
07-20-2017, 11:32 AM
25. ### 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: 3,955
07-18-2017, 10:51 AM
26. ### 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: 30,033
07-18-2017, 02:24 AM
27. ### 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: 690
07-17-2017, 02:04 PM
28. ### 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: 491
07-17-2017, 12:42 PM
29. ### 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: 588
07-17-2017, 06:57 AM
30. ### 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: 1,496
07-15-2017, 02:22 PM
31. ### 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: 418
07-15-2017, 01:51 PM
32. ### 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: 1,607
07-15-2017, 02:15 AM
33. ### 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: 814
07-14-2017, 04:07 PM
34. ### 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: 1,463
07-14-2017, 09:19 AM
35. ### 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: 767
07-14-2017, 04:31 AM
36. ### 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: 556
07-13-2017, 11:37 AM
37. ### 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: 549
07-11-2017, 06:55 AM
38. ### 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: 1,445
07-10-2017, 03:38 PM
39. ### Emergency! My Statistics Exam. Please help me :(((

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: 672
07-09-2017, 04:54 PM
40. ### Factorial Within-Subjects Repeated Measures ANOVA... Sample Size?!

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• Replies: 1
• Views: 646
07-08-2017, 08:10 PM
41. ### 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: 568
07-07-2017, 12:14 PM
42. ### 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: 657
07-07-2017, 12:13 PM
43. ### degrees of freedom in a survey

Removed question........

• Replies: 1
• Views: 602
07-07-2017, 12:08 PM
44. ### Question About Median

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: 1,133
07-05-2017, 08:15 PM
45. ### 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: 372
07-04-2017, 03:55 AM
46. ### 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: 403
07-03-2017, 04:07 PM
47. ### 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: 469
07-03-2017, 03:43 PM
48. ### 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: 408
07-03-2017, 01:45 PM
49. ### 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: 867
07-01-2017, 09:46 AM
50. ### Selection of Priors for Bayes (Logistic)

Well I am working on slowly incorporating a more Bayesian approach in order to get away from NHST. I am running a Bayesian logistic model with one...

• Replies: 4
• Views: 2,395
06-30-2017, 10:18 PM
51. ### random sampling versus choice based sampling

Hi everyone, I have got a question about sampling. I have collected all the available firms from a database and the resultant dataset is an...

• Replies: 2
• Views: 577
06-30-2017, 07:44 PM
52. ### Manova's Box test of equality is not computed

Happy Holidays everyone! I have been trying to run a MANOVA with one IV (factor) where there are 6 categories and 24 summed questionnaire items...

• Replies: 1
• Views: 4,257
06-29-2017, 10:37 AM

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