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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: 196,722
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: 66,733
09-30-2005, 09:44 AM
1. ### L1 distance between empirical and true distribution for discrete distributions

I have a discrete distribution over the set {1, \ldots, d} with a corresponding pmf P. Given a dataset with n i.i.d. samples from P, I compute the...

• Replies: 0
• Views: 1,724
10-18-2014, 01:39 PM
2. ### Regression model with no constant term & more

Hi guys, There are a bunch of things that I'm getting confused about and while I've researched online for resources to get clarification, I'm...

• Replies: 2
• Views: 2,148
10-18-2014, 11:21 AM
3. ### "Linear at the Parameters"

I'm having a hard time with this concept. I've read as many different sources on this terminology as I can find, but it seems that most of them...

• Replies: 5
• Views: 2,275
10-18-2014, 09:09 AM
4. ### Independents and dependents Events

I've been sitting on this problem for awhile. i cannot figure it out. i looked in the back of the book for the answer ( independent; .000507) i've...

• Replies: 1
• Views: 4,288
10-17-2014, 08:19 PM
5. ### Partial Correlation

Hello everybody, normally I wouldn't use a forum but this is a last resort. 3. SQ3: Is there a linear relationship between engine size and...

• Replies: 0
• Views: 1,174
10-17-2014, 05:47 PM
6. ### Type I and Type II Error

Let {X1, X2, ..., X25} be a random sample of 25 observations from a normal population havingmean μ and variance 2. Define the null hypothesis H0 : μ...

• Replies: 3
• Views: 1,065
10-17-2014, 02:38 PM
7. ### Testing is a sample has been rigged??

Hello All, This is my first post so please be gentle, I did applied stats 22 years ago as part of my Physics degree but that was, well, 22 years...

• Replies: 3
• Views: 1,381
10-17-2014, 02:37 PM
8. ### ANOVA contrast coding for 4 groups.

Hello, I have four groups 1, 2, 3, and 4, and I'm trying to compare the average of 1 and 2 vs. group 3 and group 4 (note not the average of group...

• Replies: 2
• Views: 2,664
10-17-2014, 12:47 PM
9. ### Analysing a rank order

Hi all, I am a doctor who have absolutely close to 0 knowledge about statistics. Here is my problem, Imagine a situation where 1000 students...

• Replies: 2
• Views: 1,880
10-16-2014, 10:03 AM
10. ### How to plot non-parametric data with multiple time points?

Hello, I analyzed some physiologic data (blood electrolyte levels etc) which was fairly skewed, so I used Kruskal-Wallis to test for differences...

• Replies: 0
• Views: 950
10-16-2014, 09:21 AM
11. ### Testing the Normality of Errors in Regression?

Hi all, I have simple conceptual question: In the simple linear regression problem, where the true relationship is, y = ax + b + e the...

• Replies: 4
• Views: 2,674
10-16-2014, 12:37 AM
12. ### What test to use for longitudinal data and to test interactions among factors?

My study involves five plant varieties subjected to three cultivation methods in two different sites. Every week for six weeks, we record the...

• Replies: 2
• Views: 1,505
10-15-2014, 11:09 PM
13. ### Which statistical test will return more power??

Hello, I am performing an analysis for a study and I have a small sample size (N = 25). There are pre and post test scores for each person on...

• Replies: 3
• Views: 1,909
10-15-2014, 03:38 PM
14. ### calculate the value of the appropriate test statistic?

calculate the value of the appropriate test statistic? I have worked p-value and it is 0.23 can anyone help me with test value? thanks

• Replies: 6
• Views: 2,965
10-15-2014, 12:31 PM
15. ### Making statistical statements on set of (unconnected) experiments

Hi! I am currently in the last phase of my thesis project and need to perform “meta” analysis on my experiment data… as I am struggling with some...

• Replies: 2
• Views: 1,428
10-15-2014, 05:04 AM
16. ### find pmf by using mgf

hi! I have problem to solve the question below..did i need to use Poisson distribution to solve this question or maybe not?? Find the probability...

• Replies: 1
• Views: 3,500
BGM
10-15-2014, 01:37 AM
17. ### using mann whitney vs chi square

Hi, I am wondering whether I should be using a chi square or a mann whitney test for comparing my data. I have two groups of people and want to...

• Replies: 3
• Views: 2,030
10-14-2014, 05:10 AM
18. ### Interesting Stats Question: Verifying Algorithmic Trading Returns

Hey guys, First off, thank you to anyone who helps out! I haven't been in statistics for a while and, quite honestly, learning the T-Test online...

• Replies: 0
• Views: 1,220
10-13-2014, 09:33 PM
19. ### binomial distributions (family size)

particularly part B. Thanks! A couple with two girls has decided to keep having children until they have exactly two boys. The probability of a...

• Replies: 2
• Views: 2,039
10-13-2014, 09:09 PM
20. ### Maximum likelihood estimation and GLMs - can you help me refresh my rusty memory?

Hi all, I was wondering if you can help me refresh my rusty memory on maximum likelihood estimation. I think I remember the basic concept from...

• Replies: 5
• Views: 3,741
10-13-2014, 04:58 PM
21. ### How do you calculate the p-value by hand? Only learned how to do it electronically

Hello, I am making a Java program that can run a full 1-sample z-test for sample mean and I would like to know how to calculate the p-value by...

• Replies: 6
• Views: 3,997
10-13-2014, 04:35 PM
22. ### Which test to run to check if sales incentives working across two quarters?

hi all, I have a 200 person sales force selling product A. However, we acquired another services company which provide services to product A. Now...

• Replies: 0
• Views: 1,347
10-13-2014, 12:42 PM
23. ### Non-parametric tests - still valid if your data are dominated by 0s and 1s?

Hi everyone, I have a question about non-parametric tests and what to do when your data are dominated by low values (e.g. 0s and 1s)? I'll give an...

• Replies: 5
• Views: 2,019
NCM
10-13-2014, 12:03 PM
24. ### Explaining 'if' statements using mathematical notation

:confused: I am having trouble converting rules into mathematical notation, and maybe someone could help?! What I have are two variables: ...

• Replies: 3
• Views: 1,642
10-13-2014, 10:52 AM
25. ### gamma distribution

kindly provide some hints The weekly amount of down time Y (in hours) for an industrial machine has approximately a gamma distribution with mean...

• Replies: 1
• Views: 2,897
10-13-2014, 10:50 AM
26. ### Determining Course Selection Based on Mean and Standard Deviation

How would I go about in determining the best course based on the mean and standard deviations from the following data: Class 1: mean=88.7%, SD=1.2...

• Replies: 0
• Views: 1,177
10-12-2014, 11:53 PM
27. ### Comparing measured and calculated solar data

I have created a program that outputs the average solar radiation available over a day for a specific location. I would like to statistically compare...

• Replies: 1
• Views: 1,401
10-12-2014, 07:41 PM
28. ### Demonstration of statistical indipendence in a two way table

Hello at all guys There is someone which is able to demonstrate why , withi statistical indipendence, the conjoint frequency is the same of the...

• Replies: 8
• Views: 2,393
10-12-2014, 08:45 AM
29. ### What test to get a P-Value?

So I have a group of students all divided by different categories in response to a poll. There is a total of 34 students. Depending on each answer, I...

• Replies: 6
• Views: 2,278
10-11-2014, 07:45 PM
30. ### Reverse Coding in GSS, Brief Explanation Requested

I am doing a data analysis project in my statistics class and my professor liked all the data tables that I had found for my proposal and asked me to...

• Replies: 0
• Views: 1,830
10-11-2014, 07:16 PM
31. ### Should I standardize response variables in a panel regression?

Suppose I have the following Data Yit = price of one foreign currency in one US dollar, at time t, where i= different countries Xit=employment rate...

• Replies: 0
• Views: 1,536
10-11-2014, 01:48 PM
32. ### Multiple Drug Treatment Effects

Suppose I have five vitamins VA VB VC VD VE, and wish to study the effects of each drug on the weight of patients with data measured at daily...

• Replies: 0
• Views: 1,244
10-11-2014, 01:43 PM
33. ### Which test?

Hi, I have question which statistic test to use (if possible): I want to analyse the use of medicines after an intervention. The dataset includes...

• Replies: 1
• Views: 1,162
10-11-2014, 10:10 AM
34. ### Hello All : Need some help please re: Control Chart testing

Hi All This is my first time posting here and im a bit of a statistics newbie but im have begun studying for my Six Sigma Blackbelt. One...

• Replies: 3
• Views: 1,901
10-10-2014, 07:22 AM
35. ### Individual Growth Modelling

Hi All, I'm looking for help for a Multilevel analysis, Individual growth Curve. Basically I'm struggling how to set up correctly in SPSS the...

• Replies: 0
• Views: 1,066
10-10-2014, 03:41 AM
36. ### Anyone can help me solve this Bayes statistics peoblem?Thanks so much!

1. Exchangeability with known model parameters: For each of the following three examples, answer: (i) Are observations y1 and y2 exchangeable? (ii)...

• Replies: 0
• Views: 1,557
10-09-2014, 03:09 PM
37. ### What test to compare continuous, dependent variables?

Hi I'm doing some scientific research and will be taking different samples (e.g. blood, urine, sputum) from the same subject that I want to...

• Replies: 3
• Views: 1,411
10-09-2014, 11:39 AM
38. ### What hypothesis test?

I have a population of Z items, where X must pass and Y must fail. The thing is that the X that pass is not just a count (i.e. if 2 must pass, it...

• Replies: 3
• Views: 1,851
10-09-2014, 08:14 AM
39. ### Sampling Broken into Multiple Groups: What's wrong with this?

Hello. I have a question where i have to determine what is incorrect with the following sampling methodology to determine sample sizes. The problem...

• Replies: 0
• Views: 1,229
10-09-2014, 08:09 AM
40. ### Comparing scores from two different tests

The post "comparing scores from two different tests" has been deleted.

• Replies: 0
• Views: 1,419
10-08-2014, 09:08 PM
41. ### Cumulative distribution function (cdf) - empirical vs theoretical ?

Hello to all, I have a data-set with n = 90, probably follows the gamma distribution. I used the maximum-likelihood estimation (MLE) to estimated...

• Replies: 3
• Views: 1,979
10-08-2014, 07:45 PM
42. ### Standard deviation of relative values

Hi! I have 5 datasets each for 20 subjects which I have to plot relative to a baseline. To be more specific: Dataset 1: Contains mean value of...

• Replies: 0
• Views: 1,403
10-08-2014, 04:57 PM
43. ### Finding error for probabilistic image segmentation

I have an image and I want to segment an object in it, but instead of creating a binary image, I calculate the probability of being in the object for...

• Replies: 0
• Views: 897
10-08-2014, 10:41 AM
44. ### Data analysis with a GEE, is my method valid?

Hi everyone, I’ve been doing some statistical analyses in R on some data. It’s for use in a manuscript I’m hoping to get published in a biological...

• Replies: 13
• Views: 4,997
10-07-2014, 10:01 PM
45. ### Correlation

Hello, I had to miss my last class in stats and I don't know how to solve this question. 1. For each of the following combinations of values,...

• Replies: 2
• Views: 1,392
10-07-2014, 09:55 PM
46. ### Testing for normality on correlated data (covariance matrix known).

Hi all, I have an experimental data set of . Where (now) x_i's are the predictor variables (independent, no uncertainty) and the y_i's are the...

• Replies: 4
• Views: 1,525
10-07-2014, 01:57 PM
47. ### Exponential Family-Example

I have the following question. Does anybody know an example where the MLE is biased for an exponential family distribution, i.e. ...

• Replies: 1
• Views: 1,156
10-07-2014, 10:55 AM
48. ### Which analysis? Impact of events on future behaviour - t test?

Hi everyone, I'm still quite new to statistical analysis so I really would appreciate your input on how you would approach the following problem:...

• Replies: 0
• Views: 1,245
10-07-2014, 06:34 AM
49. ### Significance of two-sample problem/test

I am self-studying an applied statistics course (reading the curriculum, doing the recommended exercises, doing old projects etc.) and I am now...

• Replies: 4
• Views: 1,614
10-07-2014, 05:20 AM
50. ### Stat Newbie: Quantifying Home Field Advantage Based on Attendance?

Hi all! So, I noticed a pretty clear, statistical trend: college football teams perform better when their stadiums are full. But I realized...

• Replies: 0
• Views: 1,034
10-06-2014, 11:26 PM
51. ### Last week of Stats, need help!!!!!

I have two papers due this week and they are both critical thinking prompts. I am having the worst trouble ever trying to figure out which...

• Replies: 2
• Views: 2,282
10-06-2014, 07:07 PM
52. ### Normal and non-parametric repeated test data

Hi All I have done some experimental work and collected data for the conductivity of water with various concentrations of salt. The experiment...

• Replies: 0
• Views: 1,577
10-06-2014, 01:13 PM
53. ### I need help

I need your help with my univerity project, I am testing awareness of insurance. (Yes/no) againt media internet,newspaper, tv, radios to see if...

• Replies: 9
• Views: 2,529
10-06-2014, 10:49 AM
54. ### How to test for independence in a 2x5 contingency table

I want to test for independence on awareness of insurance against means of getting information. Are you aware of insurance services (yes/No) How...

• Replies: 4
• Views: 4,299
10-06-2014, 07:21 AM
55. ### Question about Chi Square and Fisher Exact Tests

Hi, I'm very much working in stats by necessity, so much of my knowledge is coming somewhat on the fly. I had a question about two non-parametric...

• Replies: 1
• Views: 2,025
10-06-2014, 06:23 AM

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