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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  1. Sticky Thread 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...

    Started by TheEcologist‎, 11-27-2010 11:13 AM
    • Replies: 1
    • Views: 73,392
    07-16-2014, 11:01 AM Go to last post
  2. Arrow Sticky Thread 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)...

    Started by quark‎, 09-30-2005 09:44 AM
    • Replies: 0
    • Views: 25,834
    09-30-2005, 09:44 AM Go to last post
  1. Measuring agreement between categorical and continuous variables

    Hi all, First post here. I'm currently measuring agreement between continuous and categorical variables that are also in different units of...

    Started by FightingBull‎, Today 04:27 PM
    agreement, method comparison
    • Replies: 0
    • Views: 77
    Today, 04:27 PM Go to last post
  2. very large exp(B) value - seems strange

    Hi, I ran a logistic regression in SPSS with two dichotomous categorical predictors and their interaction to predict my dichotomous outcome...

    Started by jamie157‎, Yesterday 11:20 AM
    • Replies: 6
    • Views: 190
    Today, 01:20 PM Go to last post
  3. t - test for after regression analysis

    I want to find the dominant one among two theories which give predictions about the relationships between one dependent variable( Y ) and some...

    Started by sandip2k1in‎, Today 11:26 AM
    • Replies: 0
    • Views: 118
    Today, 11:26 AM Go to last post
  4. Unique " t - test" - Kindly help

    I want to find the dominant one among two theories which give predictions about the relationships between one dependent variable( Y ) and some...

    Started by sandip2k1in‎, Today 04:10 AM
    t-test two-sample
    • Replies: 0
    • Views: 116
    Today, 04:10 AM Go to last post
  5. SD/SE of Percentage Question

    Have a question that's probably painfully easy to address. Little slow. I am sampling from a hypothetical infinite population with an unknown...

    Started by Enrique‎, Today 12:31 AM
    • Replies: 1
    • Views: 101
    Today, 01:01 AM Go to last post
  6. CLT and sample distribution of sample mean

    On a particular stretch of highway, the state police know that the average speed is 62 mph with a standard deviation of 5 mph. On a busy holiday...

    Started by ajc‎, 10-20-2014 10:38 PM
    • Replies: 1
    • Views: 181
    Yesterday, 10:25 AM Go to last post
  7. Can someone help me to answer in my research homework

    I am studying a basic research course and making an assumed research project. The sample size I used is 120 people calculated by using a conservative...

    Started by togorius01‎, 10-19-2014 11:37 PM
    • Replies: 3
    • Views: 225
    10-20-2014, 10:19 PM Go to last post
  8. Calculating Bayes statistic from a t-test result

    Hi, Part one of the study in question analysed whether participants had a preference for chocolate when eating alone compared to eating with someone...

    Started by op2222‎, 10-18-2014 06:56 AM
    • Replies: 1
    • Views: 209
    10-20-2014, 05:14 PM Go to last post
  9. using theoretical probability

    I read an article recently where the author generates randomized profit data based on a %Win and Profit Factor. Based on this data's standard...

    Started by dalai‎, 10-10-2014 01:14 AM
    • Replies: 3
    • Views: 243
    10-20-2014, 02:03 PM Go to last post
  10. Central Limit Theorm Basics Help

    First time on boards, nice to meet you all! I need a little help understanding my homework, some of the notations are putting roadblocks on me...

    Started by Meteo‎, 10-20-2014 12:57 PM
    • Replies: 4
    • Views: 175
    10-20-2014, 01:52 PM Go to last post
  11. Universe size vary between original and the material to compare

    This might seem quite trivial to a stats whizz but I just can't wrap my head around it. So right now, I'm working on a project to validate the...

    Started by Schweutsch‎, 10-20-2014 02:08 AM
    ocr evaluation, variyng universe
    • Replies: 1
    • Views: 176
    10-20-2014, 10:20 AM Go to last post
  12. Determine Mean and Standard Deviation from Z-Score

    The instructor announces that 75 percent of students scored above the mean. How do you reconcile this with the fact that, in a normal distribution,...

    Started by Raybob‎, 10-19-2014 04:13 PM
    • Replies: 3
    • Views: 277
    10-20-2014, 10:09 AM Go to last post
  13. Testing Hypotheses about Means and Proportion

    Hello Everyone! I am having trouble with one of my questions it goes: It is claimed that fewer than 30% of Thunder Bay households have home...

    Started by Sharp‎, 10-19-2014 11:28 AM
    hypotheses testing
    • Replies: 5
    • Views: 234
    10-19-2014, 11:26 PM Go to last post
  14. Elementary Statistics Help - Video Lessons

    I'm looking for some useful video lessons for elementary statistics. I've stumbled into some pretty good youtube lessons online from Dr. Nic at...

    Started by monkeykeeper‎, 10-19-2014 01:41 AM
    statistics video lessons
    • Replies: 0
    • Views: 173
    10-19-2014, 01:41 AM Go to last post
  15. Nested Models

    Going through this concept for the first time. The literature's and teacher's explanations make sense nominally: "Two models are nested if both...

    Started by JTWood‎, 10-18-2014 09:17 PM
    • Replies: 2
    • Views: 135
    10-18-2014, 10:14 PM Go to last post
  16. type of regression model

    Which type of regression model is it y=a+bx+e

    Started by sara b‎, 01-16-2014 10:25 AM
    • Replies: 10
    • Views: 417
    10-18-2014, 03:40 PM Go to last post
  17. 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...

    Started by jyojyon‎, 10-18-2014 01:39 PM
    density estimation, empirical distribution
    • Replies: 0
    • Views: 151
    10-18-2014, 01:39 PM Go to last post
  18. 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...

    Started by excelmac‎, 10-18-2014 10:28 AM
    no constant term model, regression, time series
    • Replies: 2
    • Views: 175
    10-18-2014, 11:21 AM Go to last post
  19. "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...

    Started by JTWood‎, 10-18-2014 07:31 AM
    • Replies: 5
    • Views: 221
    10-18-2014, 09:09 AM Go to last post
  20. 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...

    Started by iDoThis‎, 09-24-2014 09:29 PM
    • Replies: 1
    • Views: 290
    10-17-2014, 08:19 PM Go to last post
  21. 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...

    Started by jfrancx‎, 10-17-2014 05:47 PM
    • Replies: 0
    • Views: 119
    10-17-2014, 05:47 PM Go to last post
  22. 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...

    Started by oharman‎, 10-17-2014 07:34 AM
    • Replies: 3
    • Views: 212
    10-17-2014, 02:38 PM Go to last post
  23. 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...

    Started by Andy Carr‎, 10-17-2014 03:24 AM
    sample rigging random
    • Replies: 3
    • Views: 227
    10-17-2014, 02:37 PM Go to last post
  24. 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...

    Started by mbetennis01‎, 10-17-2014 09:08 AM
    contrast coefficients
    • Replies: 2
    • Views: 178
    10-17-2014, 12:47 PM Go to last post
  25. 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...

    Started by Lasitha‎, 10-12-2014 12:56 AM
    • Replies: 2
    • Views: 322
    10-16-2014, 10:03 AM Go to last post
  26. 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...

    Started by awolf‎, 10-16-2014 09:21 AM
    interquartile range, kruskal wallis, non-parameteric, plot, standard deviation
    • Replies: 0
    • Views: 188
    10-16-2014, 09:21 AM Go to last post
  27. 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...

    Started by mity‎, 10-15-2014 10:57 AM
    correlated errors, normality, regresion analysis, residual
    • Replies: 4
    • Views: 376
    10-16-2014, 12:37 AM Go to last post
  28. 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...

    Started by ara_bidopsis22‎, 10-15-2014 05:28 AM
    anova, interactions, longitudinal data
    • Replies: 2
    • Views: 242
    10-15-2014, 11:09 PM Go to last post
  29. Least square line of best fit

    I am looking for a references for the least square line of best fit. Preferably a journal paper. Thanks!

    Started by Phdstudentz‎, 10-15-2014 09:59 AM
    • Replies: 1
    • Views: 229
    10-15-2014, 05:27 PM Go to last post
  30. 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...

    Started by Brianna‎, 10-14-2014 05:12 PM
    • Replies: 3
    • Views: 290
    10-15-2014, 03:38 PM Go to last post
  31. 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

    Started by tflow‎, 10-14-2014 06:02 AM
    • Replies: 6
    • Views: 292
    10-15-2014, 12:31 PM Go to last post
  32. Comparing data from multiple samples - which model?

    Hello My job is to measure electrical characteristics of transistors e.g. onset voltage or threshold voltage. Every wafer I test has roughly 4000...

    Started by pete900‎, 10-14-2014 08:56 AM
    anova, multiple, samples, transistors
    • Replies: 4
    • Views: 347
    10-15-2014, 11:23 AM Go to last post
  33. Calculating the impact of Conversion decline

    On the attachment is a data table and I'm trying to understand the impact of the drop in Order Conversion from 2014 to 2013 by each Group (A-J). I...

    Started by razeudejavu‎, 10-15-2014 09:38 AM
    • Replies: 0
    • Views: 167
    10-15-2014, 09:38 AM Go to last post
  34. 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...

    Started by falcop‎, 10-14-2014 05:40 AM
    • Replies: 2
    • Views: 257
    10-15-2014, 05:04 AM Go to last post
  35. 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...

    Started by ctaiza‎, 10-14-2014 11:43 PM
    • Replies: 1
    • Views: 211
    10-15-2014, 01:37 AM Go to last post
  36. Is this a British thing? "Relative Sampling Accuracy", Margin of Error and SE

    I'm not a student but I am reading a British textbook and have come across a term I have not seen before: Relative sampling accuracy. The author...

    Started by blue11‎, 10-14-2014 04:06 PM
    • Replies: 0
    • Views: 211
    10-14-2014, 04:06 PM Go to last post
  37. 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...

    Started by jamie157‎, 10-02-2014 05:06 AM
    • Replies: 3
    • Views: 341
    10-14-2014, 05:10 AM Go to last post
  38. 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...

    Started by ahouriani‎, 10-13-2014 09:33 PM
    • Replies: 0
    • Views: 305
    10-13-2014, 09:33 PM Go to last post
  39. 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...

    Started by lkwokchu‎, 10-13-2014 01:04 AM
    • Replies: 2
    • Views: 340
    10-13-2014, 09:09 PM Go to last post
  40. Question 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...

    Started by JohnDoe2014‎, 10-09-2014 06:04 PM
    glm, maximum likelihood, regression
    • Replies: 5
    • Views: 448
    10-13-2014, 04:58 PM Go to last post
  41. 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...

    Started by solospirit‎, 10-13-2014 03:04 PM
    java, statistics, z-score
    • Replies: 6
    • Views: 336
    10-13-2014, 04:35 PM Go to last post
  42. Question 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...

    Started by statsnovice1‎, 10-13-2014 12:42 PM
    anova, correlation, f-test
    • Replies: 0
    • Views: 203
    10-13-2014, 12:42 PM Go to last post
  43. 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...

    Started by NCM‎, 10-13-2014 05:46 AM
    • Replies: 5
    • Views: 314
    10-13-2014, 12:03 PM Go to last post
  44. Post 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: ...

    Started by yccmp‎, 10-13-2014 03:09 AM
    • Replies: 3
    • Views: 214
    10-13-2014, 10:52 AM Go to last post
  45. 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...

    Started by lkwokchu‎, 10-13-2014 01:01 AM
    • Replies: 1
    • Views: 175
    10-13-2014, 10:50 AM Go to last post
  46. 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...

    Started by Raybob‎, 10-12-2014 11:53 PM
    • Replies: 0
    • Views: 255
    10-12-2014, 11:53 PM Go to last post
  47. 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...

    Started by pepster‎, 10-12-2014 09:39 AM
    solar data comparison
    • Replies: 1
    • Views: 273
    10-12-2014, 07:41 PM Go to last post
  48. 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...

    Started by davidecortellino‎, 10-05-2014 12:17 PM
    #indipendence, #twowaytable
    • Replies: 8
    • Views: 428
    10-12-2014, 08:45 AM Go to last post
  49. 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...

    Started by crisisinmedicine‎, 10-10-2014 02:08 PM
    categorical, data, pvalue, significant, stats
    • Replies: 6
    • Views: 466
    10-11-2014, 07:45 PM Go to last post
  50. 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...

    Started by aaronbw‎, 10-11-2014 07:16 PM
    • Replies: 0
    • Views: 169
    10-11-2014, 07:16 PM Go to last post
  51. Red face 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...

    Started by hewei2004‎, 10-11-2014 01:48 PM
    panel
    • Replies: 0
    • Views: 180
    10-11-2014, 01:48 PM Go to last post
  52. Smile 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...

    Started by hewei2004‎, 10-11-2014 01:43 PM
    treatment
    • Replies: 0
    • Views: 188
    10-11-2014, 01:43 PM Go to last post
  53. PCA or multidimensional scaling?

    Hi everyone, I have a set of chemical fingerprints of 10 plant samples of the same species. I did some LC/MS analysis and I identified the most...

    Started by robertson92‎, 10-10-2014 04:15 AM
    • Replies: 7
    • Views: 358
    10-11-2014, 12:07 PM Go to last post
  54. 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...

    Started by bollibompa‎, 10-11-2014 06:42 AM
    • Replies: 1
    • Views: 231
    10-11-2014, 10:10 AM Go to last post
  55. Chi squared on binary presence/ absence data?

    Hi, I have a list of samples (10) and a list of compounds (about 250). I have generated a presence absence table in which the first column is the...

    Started by robertson92‎, 10-11-2014 02:22 AM
    • Replies: 6
    • Views: 305
    10-11-2014, 03:28 AM Go to last post
  56. 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...

    Started by xbarcrawl‎, 10-10-2014 03:06 AM
    • Replies: 3
    • Views: 287
    10-10-2014, 07:22 AM Go to last post
  57. 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...

    Started by FloBGoode‎, 10-10-2014 03:41 AM
    • Replies: 0
    • Views: 215
    10-10-2014, 03:41 AM Go to last post
  58. How to solve this bayes statistics question? Anyone knows?

    I put it in the file, please download. All the formula and graphs are in the file.

    Started by solarboy‎, 10-09-2014 03:16 PM
    • Replies: 0
    • Views: 237
    10-09-2014, 03:16 PM Go to last post
  59. 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)...

    Started by solarboy‎, 10-09-2014 03:09 PM
    • Replies: 0
    • Views: 206
    10-09-2014, 03:09 PM Go to last post
  60. Question 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...

    Started by HugoF‎, 10-09-2014 11:00 AM
    • Replies: 3
    • Views: 227
    10-09-2014, 11:39 AM Go to last post

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