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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: 197,211
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: 66,986
09-30-2005, 09:44 AM
1. ### Comparing mortality rates? 2-sample t-test vs Chi sq vs Poisson regression vs others

Hi there, Sorry for my ignorance but been a while since I did stats. I am comparing mortality rates between two breeds of pigs. My ultimate...

• Replies: 1
• Views: 1,553
03-07-2016, 07:17 AM
2. ### Cox regression with varying data completion

Gentlemen Many thanks for providing a fantastic resource in many previous projects, I have often found very helpful answers to simple questions...

• Replies: 0
• Views: 1,148
03-07-2016, 05:25 AM
3. ### How many tickets were sold ?

Suppose raffle tickets were sold for a charitable fundraising. The responsible organization sold many tickets, but you had no idea what was the...

• Replies: 0
• Views: 1,229
03-07-2016, 02:00 AM
4. ### Distribution normality test

Dear friends, please assist. I have data set (sales) and before treating it as normal distributed data for my homework I need to test it for...

• Replies: 3
• Views: 1,975
03-06-2016, 05:38 PM
5. ### Standard errors from non-random samples

I've been analyzing an insurance claims database from a non-random convenience sample of claims from individuals with employer-sponsored insurance...

• Replies: 2
• Views: 1,257
03-06-2016, 11:34 AM
6. ### Continous-probability function, cumulative

Hello again, second time posting here now, tried my luck once and you guys were very helpful so i will try again: The first is concerning the...

• Replies: 2
• Views: 1,158
03-06-2016, 02:46 AM
7. ### Do percentile rankings from a weighted average have identical distributions?

I was wondering if you could help me figure this out. I'm at a school that determines class rank for a year by a percent rank of scores determined by...

• Replies: 0
• Views: 1,223
03-05-2016, 09:06 PM
8. ### Bootstrapping with One-way ANOVA design and confidence interval

Hello, I am new to this forum, and I need some helps in bootstrapping. I am using Matlab. So, here's the study design: I have three groups...

• Replies: 2
• Views: 3,323
03-04-2016, 07:43 PM
9. ### What Test To Use?

Hi guys, I am totally stuck trying to perform statistical tests for my project and was wondering if somebody could help? Basically, I distributed...

• Replies: 2
• Views: 1,749
03-04-2016, 12:19 PM
10. ### Help with C.I. for non normal probability distribution Excercise

Hi! first time poster here! I have done (correctly I hope) most of the exercise except for segment "B) i)" So I need help with it :(:( Here's...

• Replies: 0
• Views: 1,293
03-03-2016, 04:31 PM
11. ### Confidence interval for unknown probability

Suppose I have a black box with one button and one light. There is a fixed, but unknown, probability, P, that the light will come one whenever the...

• Replies: 6
• Views: 1,143
03-03-2016, 04:17 PM
12. ### Probability/ Prediction interval

Hi everyone, I have been given the following question: 'The weight of Sunstat apples, measured in grams, follows a normal distribution with a...

• Replies: 0
• Views: 754
03-03-2016, 03:00 PM
13. ### Calculate percentages to be able to apply Fisher's exact test

I have a 2x2 contingency table, but the total sample size is too large to be able to directly apply Fisher's exact test (as it involves factorials,...

• Replies: 0
• Views: 918
03-03-2016, 07:37 AM
14. ### how to assess matris/areas overlapping

I have two binary matrixes, of the same size (e.j. 5000x5000). Those matrixes represent the same area, divided in cells of the same size. Each cell...

• Replies: 0
• Views: 854
03-03-2016, 04:35 AM
15. ### Report insignificant results negative binomial

Hello everyone, I've used a negative binomial model to predict invertebrate densities. The model fits but is not significant, so I don't want to...

• Replies: 2
• Views: 2,080
03-02-2016, 04:38 PM
16. ### ANOVA - Greenhouse Geisser

Hey folks, I'm just a little bit confused and hope someone might can help me: I'm working on the statistics part of my thesis and performed...

• Replies: 4
• Views: 25,173
Oak
03-02-2016, 11:05 AM
17. ### Does Imposing a Constrain Make a Method More Powerful?

Suppose we have 100 patients in a randomized trial. 50 of them are in treatment group and the rest are in placebo group. This is a longitudinal...

• Replies: 1
• Views: 1,242
03-02-2016, 10:10 AM

I'm writing with a question: We are organizing a scholarship program and we're in the midst of assessing applications. Each application has been...

• Replies: 0
• Views: 945
03-02-2016, 03:34 AM

Determine the probability that at least two people in a room of 30 share the same birthday (excluding year) ignoring leap years and assuming each...

• Replies: 4
• Views: 1,116
03-02-2016, 01:29 AM
20. ### chalnging Q regards MSE

prove or contradict that the MSE of mean driven from sample of N*M is lower than the MSE of mean driven from sample of N. N,M are natural bigger...

• Replies: 2
• Views: 1,127
03-02-2016, 12:27 AM
21. ### Meanss within Clustered Data

I have continuous data, though the people contribute a varied amount of observations. So say I have 100 observations and 15 people, most people...

• Replies: 1
• Views: 886
03-01-2016, 10:49 AM
22. ### 90% VS 99% Confidence Interval

To create confidence intervals using the normal distribution, if the area alpha/2 is not in the table and it is exactly in between two areas, should...

• Replies: 3
• Views: 1,091
03-01-2016, 10:29 AM
23. ### how to justify a sample size for an underpowered pilot study

UPDATE: I reposted this in the biostatistics forum. I also added some more details, mainly my not-fully-formed thoughts about how to proceed. ...

• Replies: 1
• Views: 2,970
03-01-2016, 08:26 AM
24. ### GOLF scorecards combinations?

I have not find the answer in Google or elsewhere hope some one will help me find the right answer The question is about GOLF scorecards...

• Replies: 0
• Views: 908
02-29-2016, 11:19 PM
25. ### Formally correct way of interpreting a confidence interval ?

If your CI for 95% is , what is the correct way of phrasing your conclusion? It is not quite correct to say that there is a 95% chance that the...

• Replies: 5
• Views: 1,851
02-29-2016, 10:53 PM
26. ### Need help on Stat HW...should be simple, but I'm not sure how to do this. Please help

• Replies: 2
• Views: 1,496
02-29-2016, 10:19 PM
27. ### Card Problem Step-by-step please?

You are dealt 5 card from a standard 52-card deck. Would it be unusual to be dealt a full house? Explain.

• Replies: 1
• Views: 1,391
02-29-2016, 04:14 PM
28. ### Medical Experiment Problem

A medical experiment showed that a new medicine is effective is 0.75, the probability that a patient has a certain side effect is 0.4, and the...

• Replies: 1
• Views: 1,247
02-29-2016, 04:14 PM
29. ### how to deseasonlize data when the trend are similar but magnitude differs greatly?

I asked a similar question the 'applied statistics subsection' but I did not get an answer, so hoping I can get some ideas here (apologize for...

• Replies: 1
• Views: 1,373
02-29-2016, 12:38 PM
30. ### measurement level of exponential temperature in degrees Celsius

I was wondering about the following theoretical example. Assume that I have measured temperature in degrees Celsius on various days (x), and for some...

• Replies: 0
• Views: 2,089
02-29-2016, 09:38 AM
31. ### Bonferroni vs Hotelling

So i have various measures of two closely related species of fish heart (length, width, etc... ) , and i want to find whether these hearts are...

• Replies: 1
• Views: 930
02-29-2016, 08:57 AM
32. ### Interpretation of the Likelihood Ratio Chi-Square Test Statistic

Do I still use the Chi-Square distribution table to determine the significance of the Ratio Likelihood Chi-Square test statistic? I know you use...

• Replies: 1
• Views: 1,987
02-29-2016, 08:37 AM
33. ### URGENT: Factor Analysis

Hi All, I have a basic factor analysis question. Is there any way you can/should combine the factors you get from a factor analysis output. I...

• Replies: 3
• Views: 1,640
02-29-2016, 08:09 AM
34. ### specification violation %?

Hello - I have the following question and answer below the dotted line below. I'm not sure which particular formula the answer is referring to. I...

• Replies: 3
• Views: 3,961
02-29-2016, 07:56 AM
35. ### Multivariate correlation coefficient?

Is there a simple definition (formula) for a multivariate correlation coefficient between k binomial variables, assuming that each variable is...

• Replies: 0
• Views: 950
02-28-2016, 08:35 AM
36. ### Determining High-, Low-, Non-, and Adverse Responders to Treatment

I am looking for a method/statistical cut off values to determine high responders, low responders, non-responders and adverse responders to a...

• Replies: 0
• Views: 726
02-26-2016, 01:51 AM
37. ### Sample Size and a/b testing

I know how to figure out required sample size to perform an a/b test, I am wondering if the sample size requirement would change depending on how I...

• Replies: 0
• Views: 878
02-25-2016, 07:23 PM
38. ### Statistical Analysis for Heart Monitors

Hi everyone, I am an English person who's never taken statistics (yikes, right?). Well, now I'm working a job where I need some ideas of what...

• Replies: 2
• Views: 1,363
02-25-2016, 02:25 PM
39. ### Correlation betweeen k binomial variables

Hello, This is my first post as a new member, so hope I'm posting this in the right place... I need a general formula to calculate the minimum...

• Replies: 1
• Views: 1,807
02-25-2016, 02:04 PM
40. ### T-Test: Accounting for country level & difference of two time points

Hey everyone, another student and I are currently working on a paper in which we face a problem that we just cannot solve. Probably it is super easy...

• Replies: 0
• Views: 1,838
02-25-2016, 11:08 AM
41. ### BLUP: Selection of random and fixed effect for a CRBD field design

Hi, We have disease infestation data of a germplasm set (200 genotypes), which were replicated thrice (3 blocks: Complete set of genotypes were...

• Replies: 0
• Views: 1,075
02-25-2016, 10:17 AM
42. ### Expected/Actual Values and how to rate them

Hello all. I am trying to analyze a statistics problem and i am a bit stuck. Any help would be much appreciated. The problem is this. I have a large...

• Replies: 0
• Views: 881
02-25-2016, 05:00 AM
43. ### Odds Ratio

I am having trouble intuitively understanding how a 99% chance is 2.02x more likely to happen than a 98% chance. Can anyone help me make sense of...

• Replies: 5
• Views: 1,705
02-24-2016, 04:06 PM
44. ### Affirmation of Analysis Write-up

Hi all, I am new to this forum and looking for somebody with statistical experience to affirm the write up of my results. I completely understand...

• Replies: 9
• Views: 1,533
02-24-2016, 03:37 PM
45. ### trying to understand the t-distribution

In an hypothesis test when we use the sample standard deviation and we assume that the population is normally distributed, we use the following...

• Replies: 9
• Views: 2,270
02-24-2016, 03:17 PM
46. ### Visualizing variance

I have fit a logistic regression model and repeated it many times on bootstrapped populations. The variables are not standardized. Is there an easy...

• Replies: 0
• Views: 1,400
agp
02-24-2016, 10:50 AM
47. ### Defining Contrast Matrix

Suppose I have a binary Covariate X which is defined as X = \begin{cases} 1, & \text{if treatment group} \\ 0, & \text{if placebo group}...

• Replies: 0
• Views: 1,072
02-23-2016, 10:31 PM
48. ### P-Value in overall ANOVA vs. TukeyHSD

Hey Everyone, I've been learning stats on the side and have some difficulty understanding the different methods of comparing means. I used R...

• Replies: 4
• Views: 1,548
02-23-2016, 02:49 PM
49. ### Is it possible to make the analysis of rjags repeatable?

Hi all, Thank you in advance for help. Usually, I set a seed in r script to make the result of analysis repeatable. However, if I use "rjags"...

• Replies: 0
• Views: 1,473
02-23-2016, 01:41 PM
50. ### SPSS Help

Hello everyone, I am a psychology undergraduate who has been set a formative assignment (which means its not worth anything but still has to be...

• Replies: 0
• Views: 1,288
02-23-2016, 08:41 AM
51. ### A non-parametric test for nomimal data made up from two independent variables

I have been looking for a statistical test to run for some experimental data I have acquired. I have two groups (IV); Stress and Control mice. ...

• Replies: 0
• Views: 1,127
02-23-2016, 06:12 AM
52. ### Data analysis

I have been asked to analyse the following data using linear analysis, mean standard deviation and ANOVA. However the data presented is supposed to...

• Replies: 2
• Views: 1,364
02-23-2016, 05:32 AM
53. ### univariate versus repeated measures anova

I would like to know what is the difference between univariate repeated measures anova? Thanks

• Replies: 4
• Views: 1,255
02-23-2016, 05:22 AM

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