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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: 197,168
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: 66,955
09-30-2005, 09:44 AM
1. ### a theorem about pôwer transformation

Hi, while studying on Montgomery's Design and Analysis of experiments, i saw a theorem without proof of which I don't find the correct references....

• Replies: 1
• Views: 82,893
08-09-2010, 03:11 PM
2. ### A thought about the link between Revelle's β coeff and CFA. Related?

Hi stat freaks! :confused: I've just conducted an analysis of a scale's consistency (coeffs alpha, beta, omega, theta) and CFA to inspect the...

• Replies: 1
• Views: 17,892
07-25-2015, 04:19 PM
3. ### A unequal variance t-test?

Hello, I am trying to compare answers on a survey from 1992 (another author) and now (me). The survey is identical and was sent both time to...

• Replies: 2
• Views: 2,560
03-24-2010, 07:45 AM
4. ### A uniform distribution problem

A person's score in a test is uniformly distributed over . She is permitted three attempts at the test. However, after the first attempt, she is...

• Replies: 2
• Views: 1,535
06-20-2013, 01:40 PM
5. ### A very simple Statistics question

Hello, this is my first post here and I am relatively a newbie in statistics. I was watching TV today and I heard the following statement: "66 people...

• Replies: 4
• Views: 3,006
01-13-2012, 01:00 PM
6. ### A>0 B<0 is A>B ?

I was wondering if you could help with a very quick statistics question - if in condition A subjects are found to perform significantly better than...

• Replies: 3
• Views: 2,501
Cel
02-25-2008, 10:54 AM
7. ### A-b-a-b-a

Hello everyone, I'm looking for some advice on how to analyze the results of an experiment. It concerns a repeated measures clinical study with a...

• Replies: 0
• Views: 2,009
02-21-2008, 09:12 AM
8. ### A/B Split Testing - How to factor in cost?

Hi guys! I'm looking for advices in the application on an A/B split test calculator. Hopefully we can solve this problem together... Here goes: ...

• Replies: 1
• Views: 2,973
08-28-2016, 04:28 PM
9. ### Aagh!! - % values - parametric or non parametric?

Hi good people I am a very confused PhD student, and despite my best efforts over the past 24 hours have been unable to get a definitive answer to...

• Replies: 1
• Views: 8,084
07-24-2008, 10:43 PM
10. ### Abnormal Interaction Effect

Hey people, After I have conducted an ordered logistic regression with a DV and two IVs, I get the following result: Two main effects (IV1 on DV,...

• Replies: 0
• Views: 1,040
03-26-2014, 02:13 PM
11. ### about "two factorial nonparametric analysis ",help

what is two factorial nonparametric analysis? is there any difference between it and cmh chi-square? can i use sas software to do it?

• Replies: 0
• Views: 901
03-19-2013, 02:50 AM
12. ### About Cochran-Mantel-Haenszel Test in Categorical Analysis

Hi, guys,,, I had a question of CMH test so I post a thread. I do know that cMH test is for identifying whether the response is conditionally...

• Replies: 1
• Views: 4,719
04-13-2008, 03:56 PM

There are two independent random sample of known sizes of known mean test score the standard deviations How can construct a confidence level...

• Replies: 0
• Views: 1,651
06-14-2011, 08:07 AM
14. ### About Correlations between Mathematically Dependent Variables: Best Practice?

Summary / Basic question: How do I correct for a logical (/mathematical) dependency between two variables when I want to compute the correlation...

• Replies: 0
• Views: 1,101
03-06-2014, 11:04 AM

when i conducted the project homework. i met a little problem. firstly. there are a number of category and numerical data in the project. i...

• Replies: 0
• Views: 2,725
tim
05-16-2008, 07:19 AM

I estimated two model systems with SAS proc model by using Full information maximum likelihood. Each of them have multiple nonlinear model equations....

• Replies: 0
• Views: 1,975
04-10-2008, 01:36 AM
17. ### About Mean, Median, Mode, Standard deviation

1. What is the mean, median, mode, and standard deviation for the following 13 items: 1,4,2,3,1,2,5,2,3,2,7,4,2 I solved this question: 1. mean...

• Replies: 0
• Views: 4,664
03-08-2010, 09:10 AM
18. ### About multiples of a SD

hey there, i have an issue with a task from my statistics book, its an introductory course in statistics for scientists (chemistry student), anyways...

• Replies: 4
• Views: 1,369
02-09-2016, 06:33 PM
19. ### about odds ratio again

my study is a cross sectional, and as i remember odds ratio , we calculate it in other studies, but in my litherture i found studies similar to mine...

• Replies: 3
• Views: 4,716
08-13-2010, 10:27 AM
20. ### About simple beam structure and pins

If force is worked like above picture (a little bit left side), what pin is cut first and where section of pin is cut? I also want to know what...

• Replies: 0
• Views: 2,223
06-01-2012, 11:55 PM
21. ### About the meaning of significance in SPSS

Hi, all, I am newbie using SPSS. May be the following question is sort of stupid. But I am trying to sort it out. I do only have high school...

• Replies: 1
• Views: 3,251
08-25-2013, 02:51 PM
22. ### About the measures of dispersion

Hello everyone, I have a question related to measures of dispersion. In my algorithm, I was evaluating the relative difference between two values...

• Replies: 2
• Views: 2,450
07-06-2011, 05:22 AM

Hi I want to measure the intra-examiner agreement (reliability) for ordinal data using weighted kappa I used MedCalc and it gave me 2...

• Replies: 4
• Views: 11,096
01-03-2010, 01:02 AM
24. ### Absence of interaction, but different patterns of simple main effects

Hi, I'm using linear mixed models in SPSS to analyze the Reaction Time (RT) data for my first psycholinguistic study. I have two fixed variables...

• Replies: 0
• Views: 976
01-06-2015, 12:07 PM
25. ### Absence of interaction. Planned comparisons.

Hi, I'm doing data analysis for one of my experiments. The design of the experiment is 2 (word frequency) x 3 (phrase type). Both main effects (word...

• Replies: 6
• Views: 7,657
05-15-2008, 03:31 AM
26. ### Absolute beginner needs help deciphering question

Hi there. I am an absolute novice to statistics, and have had no formal education in it since year 9 at school when we did box-plot diagrams. I...

• Replies: 7
• Views: 1,495
02-22-2013, 06:06 PM
27. ### Absolute Loss Function

I am quite honestly at an "absolute loss" with this one... I know the answer can't be 2 yet I keep getting it.. any help is much appreciated. ...

• Replies: 8
• Views: 6,998
12-05-2016, 10:07 AM
28. ### absolute versus relative frequencies in χ2 testing

Dear forum members, I am looking at two different sequences of events (s1, s2) of different length (l1, l2). Each event in the sequence can be of...

• Replies: 0
• Views: 98,679
12-17-2009, 01:35 AM
29. ### Absolutely lost!

Hi everyone, I am trying to figure out how to solve the following problem and can't, for the life of me, understand which test I should use. My...

• Replies: 13
• Views: 1,995
01-19-2013, 07:32 PM

Hi all, apologies for my stupidity but engineering student and this is not my strongest subject. I'm working on a project to aid disabled and...

• Replies: 0
• Views: 1,597
05-08-2011, 04:52 AM
31. ### Accept-Reject method for Gamma using Exponential

I am reviewing the Accept-Reject method for generating random variables from a proposed distribution. I am trying to generate a Gamma(alpha, beta)...

• Replies: 0
• Views: 6,196
02-02-2011, 01:00 AM
32. ### Acceptable Differences in Measurements

I have a device that runs a particular blood test on the sample provided to it. There are 32 samples, and each is run through the device twice. Given...

• Replies: 1
• Views: 1,692
10-14-2011, 11:40 PM
33. ### Acceptable Pins

Hello, I am drawing a complete blank for some reason on the second half of this problem. It is the age old acceptable pins problem. The mean is...

• Replies: 1
• Views: 4,376
09-22-2006, 01:06 PM
34. ### Acceptable significance level for Chi-Square statistic

Hi All, I need to know if the significance level calculated for a particular Chi-square statistic is less than or equal to 0.05, can we reject the...

• Replies: 4
• Views: 13,164
06-17-2010, 08:20 AM
35. ### acceptable Skewness and Kurtosis

During statistical lectures as a rule of thumb I've learned that kurtosis and skewness between -3 and +3 is acceptable. I can't find any reference...

• Replies: 3
• Views: 19,984
07-14-2013, 06:11 AM
36. ### Acceptance Sampling

We are working on continuity corrections and using normal distribution to approximate the binomial distribution. I breezed through 22 questions but...

• Replies: 7
• Views: 4,478
03-23-2012, 04:16 AM
37. ### Accounting for common method variance

Think i put this in wrong section. Can mod delete from here? Hi, I am analysing a self reporting survey. From the survey is designed to...

• Replies: 0
• Views: 2,532
03-01-2011, 07:39 AM
38. ### Accounting for confidence intervals in determining a mean

I have received some elemental analysis of a metal which I want to use to determine the effects of radiation. I want to report my results for the...

• Replies: 0
• Views: 2,255
08-15-2013, 07:28 AM
39. ### Accounting for covariate in a mixed-model anova?

Dear all, I'm doing a study on changes in hydrogen in patients undergoing surgery. I have 2 groups of patients, and have taken 3 blood samples for...

• Replies: 0
• Views: 1,379
05-01-2012, 04:05 PM
40. ### Accounting for other variables when looking for main effects (regression)

I am doing a negative binomial regression, to look for interactions between categorical and continuous predictors. I am currently reporting main...

• Replies: 2
• Views: 1,440
04-24-2017, 11:16 AM
41. ### 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: 1,432
04-04-2014, 10:30 AM
42. ### ACF and PACF in excel

Hi, I'm looking for some help regarding calculating the PACF of a time series in excel (I already have a working formula for the ACF) Any...

• Replies: 2
• Views: 13,270
11-02-2008, 04:25 AM
43. ### 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: 1,410
04-05-2014, 08:38 PM
44. ### ACF plot in Non Stationary Time Sereis

Hello Folks I know that in non-stationary time series, the Auto Correlation Function plot dies down extremely slowly while if the series is...

• Replies: 0
• Views: 3,947
11-06-2012, 05:21 PM
45. ### Actual vs Predicted Sales

I'm looking for some help with a project: As part of a task I have had to calculate estimated sales for a number of shopping centres. I already...

• Replies: 0
• Views: 4,234
03-07-2008, 11:35 AM
46. ### Actuarial Exam Question

Hello All, I am studying for the actuarial exam, and I have come across a question which I do not understand the answer to: A device contains...

• Replies: 1
• Views: 4,020
07-14-2008, 03:10 AM
47. ### Actuarial Statistics--Find n given cost of a Perpetuity

A perpetuity costs \$77.10 and makes annual payments at the end of the year. The perpetuity pays \$1 at the end of year 2, \$2 at the end of year 3, ......

• Replies: 4
• Views: 4,651
03-09-2011, 09:37 PM
48. ### Adaptive winner selection from a list of scores

Hello, Excuse me for this probably basic question. I have a list of scores. Normally people pick the top 'k' scores (for example k=5). I do...

• Replies: 0
• Views: 1,943
01-24-2012, 10:36 AM
49. ### add 2nd order polynomial to random effects in LME

I am doing a linear mixed effects model below. mytest.1 <- lmer(income ~ 1 + years + gender + educ + I(years^2) + (1 | subid), data = emply) I...

• Replies: 0
• Views: 1,997
04-12-2012, 01:24 PM
50. ### Added-Variable Plot for Panel Data

Dear all, in Frees (2004): "Longitudinal and Panel Data" there is a short description of a procedure for Added-Variable or partial regression...

• Replies: 0
• Views: 1,416
02-12-2013, 07:46 AM
51. ### Adding Hit Rates from Two Occasions with Unequal Trial #'s to Produce Sum Hit Rate

Hi, all: Imagine that you have two Olympic archers, and the archers represent the same country. One archer lands 63/208 shots (30.3%), and the...

• Replies: 5
• Views: 1,378
06-15-2015, 09:11 AM
52. ### Adding intercept for dummy variable in Excel

Hi! Hope this forum area would be the correct one. Anyway, I've used Excel's data analysis tool to conduct a regression with two variables and a...

• Replies: 2
• Views: 4,100
11-01-2010, 03:44 PM

Hi! I am wondering what kind of datatype our new variable will get if we add variables that have ordinal datatype. For example: SWLS scale that...

• Replies: 1
• Views: 1,281
11-05-2012, 02:06 PM
54. ### Adding the mean to a set of scores doesn't change it. Why?

Hello everybody! I am very happy to have found this forum. I am working away with my undergraduate research methods courses. I am not very good at...

• Replies: 8
• Views: 2,648
01-31-2015, 04:58 AM
55. ### Adding together Z scores

Hi, question about this- I've got Z scores for 4 items of a test (each item is like its own mini test). If I just add them together, will the...

• Replies: 0
• Views: 4,147
02-11-2010, 03:45 PM

From a research source I have data on a population, but it is divided and presented in subpopulations only according to age. So for ages 18-30 I...

• Replies: 2
• Views: 2,307
08-10-2011, 09:38 AM
57. ### Addition and multiplication rules?

When exactly am I supposed to use addition or multiplication? Also, how does this play into and/or questions? For example: When drawing a single...

• Replies: 1
• Views: 1,701
BGM
06-21-2011, 09:14 AM
58. ### Additional analysis of experimental data

Hi All! I'm a student in computer science and I need some advice. I have a data set of a repeated measures design experiment with two independent...

• Replies: 0
• Views: 1,333
07-09-2015, 10:02 AM

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