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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 12:13 PM
    • Replies: 1
    • Views: 197,299
    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: 67,050
    09-30-2005, 09:44 AM Go to last post
  1. Multi response categorical data analysis

    Dear list I got a dataset of categorical data were each question can have more than one answer. This is a toy example: question one: what did...

    Started by usobi‎, 04-29-2013 04:58 AM
    • Replies: 0
    • Views: 1,036
    04-29-2013, 04:58 AM Go to last post
  2. Hypothesis testing.

    I am wondering if you can help with a problem.. i have 30 numbers, with the min 13, max 90, mean of 40.43 S is19.68 and stand deviaition of...

    Started by donemessedup‎, 04-23-2013 08:00 AM
    • Replies: 4
    • Views: 1,368
    04-28-2013, 10:59 PM Go to last post
  3. IGARCH model volatility

    I know for an IGARCH(1,1) model, the model is : y_{t} = \sigma_{t}\epsilon_{t} \sigma_{t}^{2} = \alpha_{1} + (1-\beta_{1})y_{t-1}^{2}+...

    Started by lord12‎, 04-28-2013 05:17 PM
    • Replies: 1
    • Views: 2,401
    04-28-2013, 09:51 PM Go to last post
  4. Comparing class grades across several courses is ANOVA appropriate?

    Hi all, A group of ~20 students have taken a number of courses, some compulsory and others electives. I want to see whether there is a difference...

    Started by Arete‎, 04-26-2013 09:35 PM
    • Replies: 3
    • Views: 31,467
    04-28-2013, 07:02 PM Go to last post
  5. Question Hi, need help with drawing graph (ANCOVA)

    Hello, friends! I would like to draw a line graph (ANCOVA). However, I used SPSS 17.0 and the y-axis did not begin with 0. Anyone with ideas on...

    Started by orvokki‎, 04-28-2013 01:47 PM
    • Replies: 0
    • Views: 1,343
    04-28-2013, 01:47 PM Go to last post
  6. Asymptotic Variance of a Maximum Likelihood Estimator

    A population follows the Pareto distribution defined as f(x|x_0,\theta)=\theta x_0^\theta x^{-\theta-1},\quad x\geq x_0,\quad\theta>1. Assume...

    Started by Kiuhnm‎, 04-28-2013 10:31 AM
    • Replies: 2
    • Views: 2,342
    04-28-2013, 01:32 PM Go to last post
  7. Prediction interval question

    I have data fit with a loess curve. The predictor is time. I want to know what time has the highest predicted observation and the time's confidence...

    Started by agp‎, 04-27-2013 07:06 PM
    • Replies: 4
    • Views: 1,372
    04-28-2013, 11:29 AM Go to last post
  8. Linear regression model / equality of slopes

    Hi everyone, I am currently writing my master thesis and I have some questions relating to the regression model. I am trying to prove that...

    Started by JenJ‎, 04-28-2013 10:47 AM
    • Replies: 2
    • Views: 2,319
    04-28-2013, 11:01 AM Go to last post
  9. Rejecting Alternate Hypothesis

    Hi all, thanks in advance for help. I'm in an interesting situation. I'm running a clinical trial in the ER about how a certain test affects...

    Started by w8kg6‎, 04-27-2013 05:08 PM
    • Replies: 1
    • Views: 1,178
    04-28-2013, 10:30 AM Go to last post
  10. Sample size in redesigned experiment

    This is not a homework question, even though it reads like one. I wrote it this way to make it as simple as possible to explain. An experimenter...

    Started by nesper‎, 04-28-2013 10:23 AM
    • Replies: 0
    • Views: 945
    04-28-2013, 10:23 AM Go to last post
  11. Question Calculating with types of data

    Why can't one compute with values such as 'M(ale)/F(emale)'? Can't I keep a counter of how many males and females were at an event? Am I not...

    Started by 5747157‎, 04-28-2013 09:35 AM
    calculation, nominal, ordinal
    • Replies: 0
    • Views: 886
    04-28-2013, 09:35 AM Go to last post
  12. Post Probability of an event

    A woman bears two babies and they both die. The case goes into court and they hire a statistician to figure out what the chance is of a woman...

    Started by 5747157‎, 04-28-2013 04:22 AM
    event rare probability
    • Replies: 1
    • Views: 941
    04-28-2013, 05:20 AM Go to last post
  13. Hypothesis Test for a Population Proportion

    I just need a clarification on these 2. For the requirements. When it states it has to more than 2.1 percent we use that for the p, right? What...

    Started by PSG‎, 04-26-2013 04:52 PM
    • Replies: 9
    • Views: 1,431
    04-28-2013, 12:44 AM Go to last post
  14. Please help!!

    Interpret the following: r = .45, p < .05 what if it were -.45? I am trying to finish my homework for a class and I am completely lost as...

    Started by LGB76‎, 04-27-2013 01:55 PM
    • Replies: 1
    • Views: 1,275
    04-27-2013, 02:16 PM Go to last post
  15. Question my population should be normal distributed for applying t test even with only 30c ?

    Hi to everyone! I know that t test should be applied to a normally distributed population...but is it true even when I have a small population?I...

    Started by giovanni83‎, 04-26-2013 01:41 PM
    • Replies: 2
    • Views: 1,510
    04-27-2013, 12:12 PM Go to last post
  16. interpretation of log-differences

    Hello, - my data set: gdp, interest rate (in %), money aggregate, exchange rate and cpi. - except interest rate all time series are in logs -...

    Started by DanielFox‎, 04-27-2013 12:05 PM
    • Replies: 0
    • Views: 954
    04-27-2013, 12:05 PM Go to last post
  17. Cohen D effect size breakdown.

    Hi guys, In my study I have found three variables in which demonstrate large group effect sizes (d=.8). I am now in the process of writing up my...

    Started by PaulScolesScoresGoals‎, 04-27-2013 07:08 AM
    • Replies: 0
    • Views: 2,103
    04-27-2013, 07:08 AM Go to last post
  18. how use SPSS for calculate dunn test??

    hi. I need to calculate "dunn test" for my data with SPSS software. can ou help me??

    Started by simabs2‎, 04-26-2013 11:40 AM
    • Replies: 1
    • Views: 11,402
    04-26-2013, 12:28 PM Go to last post
  19. Multi-Variable Attribution Analysis

    I have a multi-variable equation in which I am trying to run an attribution analysis for the change from one period to another. For example: ...

    Started by KRoge‎, 04-26-2013 12:22 PM
    attribution analysis, multi-variable
    • Replies: 0
    • Views: 2,178
    04-26-2013, 12:22 PM Go to last post
  20. Linear mixed model - which covariance structure to use?

    I need to run a linear mixed model analysis on my data and am very confused as to which covariance structure to use. I have collected brood...

    Started by mich867‎, 04-22-2013 12:58 AM
    • Replies: 1
    • Views: 4,008
    04-26-2013, 03:15 AM Go to last post
  21. Understanding acf plots produced from ccf function in R

    I am trying to understand the lead-lag relation between two series. So, I used CCF() function from R. The code is: ccf(drop((S_X)),drop((S_Y)))...

    Started by sak‎, 04-25-2013 08:59 AM
    • Replies: 3
    • Views: 10,702
    04-25-2013, 08:40 PM Go to last post
  22. T-test or 2X2 ANOVA

    I have data that lends itself to a 2X2 Analysis, however I want to split this into separate T-tests because I am interested in looking at differences...

    Started by Roberval‎, 04-25-2013 04:18 PM
    • Replies: 2
    • Views: 3,067
    04-25-2013, 06:35 PM Go to last post
  23. Binomial Probability Distribution

    In an experiment on ESP, a subject is asked to state the color (red or blue) of a card chosen from a deck of 25 cards. It is unknown how many red or...

    Started by 1nvictus‎, 04-25-2013 04:00 PM
    • Replies: 0
    • Views: 1,179
    04-25-2013, 04:00 PM Go to last post
  24. Lightbulb Choice of stats test: two-way repeated ANOVA or area under the curve?

    Hi guys, I am fairly new to both of these statistical techniques and would appreciate your thoughts on which test would be most appropriate for the...

    Started by jimber91‎, 04-25-2013 03:38 AM
    • Replies: 2
    • Views: 3,627
    04-25-2013, 09:58 AM Go to last post
  25. Question Data analysis - which test is best

    I would like to know which test would be appropriate for testing my hypothesis. I am doing a research project on parasitic infections in snail...

    Started by Justice!‎, 04-22-2013 08:20 AM
    2 Pages
    1 2
    • Replies: 25
    • Views: 4,229
    04-25-2013, 09:29 AM Go to last post
  26. Ordered Statistics: Variance of the difference. Difficulties in integrating.

    Hi, Attached is a question asking for a formal proof of the variance of the difference between two ordered statistics. It has 2 parts: first...

    Started by meeksoup‎, 04-25-2013 06:21 AM
    • Replies: 0
    • Views: 1,037
    04-25-2013, 06:21 AM Go to last post
  27. Kernel Density Funtion in SAS

    Hello, I run a distribution analysis in SAS and i fet the histogram of the variable of interest (drawn from a sample). I ask for a normal curve to...

    Started by zarasandreas‎, 04-16-2013 06:22 AM
    • Replies: 3
    • Views: 1,870
    04-25-2013, 02:32 AM Go to last post
  28. Finding Bayes action

    A woman must dcide between waxing her car (action a1) and not waxing her car (a2). She's concerned of the weather on whether it will be sunny (o1)...

    Started by 1nvictus‎, 04-24-2013 08:24 PM
    • Replies: 1
    • Views: 1,353
    04-24-2013, 08:50 PM Go to last post
  29. does anybody know how to learning statistics online free?

    hi everybody, i was wondering if anybody here might know a good site to learn statistics online without paying. if anyone does know a good site a...

    Started by yankeebaseball60‎, 11-09-2005 05:05 PM
    • Replies: 4
    • Views: 13,312
    04-24-2013, 08:00 PM Go to last post
  30. Categorical Variables Vs Continuous

    Hello, Let us say that we have a variable expressing the score of a student in a test that can range between 0 and 1600. The score can only take...

    Started by zarasandreas‎, 04-22-2013 07:04 AM
    • Replies: 3
    • Views: 3,654
    04-24-2013, 05:58 PM Go to last post
  31. Use of descriptive statistics,Calculation of measures of average and dispersion

    hello guys i need help. i have a work for my college but i have never done statistic. please,help me. Machine 1(weights in grams)...

    Started by paintballer‎, 04-24-2013 01:26 PM
    • Replies: 2
    • Views: 1,801
    04-24-2013, 05:15 PM Go to last post
  32. Logistic Regression / Weight of Evidence Transformed Variables

    Hi Everyone, I'm looking for some help to interpret the output of logistic regression when using predictors that have been transformed and binned...

    Started by rclukey‎, 05-16-2012 02:53 PM
    logistic, weight of evidence, woe
    • Replies: 1
    • Views: 7,190
    04-24-2013, 05:05 PM Go to last post
  33. Help with Two way anova

    Hi, I'm running a two way anova on my data. I have two factors Oxygen tension (2% and 20%) and drug dose (0um 10um and 20um). After I run the two...

    Started by jhteichr‎, 04-24-2013 12:33 PM
    • Replies: 3
    • Views: 1,405
    04-24-2013, 04:13 PM Go to last post
  34. Maximum Likelihood Function

    Hey everyone, Reviewing for a final and am going through problems in the text. One question asks me to find the maximum likelihood estimate of...

    Started by S-C-3-1-3‎, 04-24-2013 03:36 PM
    • Replies: 1
    • Views: 1,029
    04-24-2013, 03:53 PM Go to last post
  35. Traffic Intersection Probability Question

    We are doing a project and for each lane we need to find the probability of a vehicle arriving in the system arriving at an intersection after each...

    Started by kevincaz07‎, 04-22-2013 02:23 PM
    probability, statistics, traffic problem
    • Replies: 4
    • Views: 1,755
    04-24-2013, 03:35 PM Go to last post
  36. mixed effect: what should be modelled as random effect?

    I'm trying to figure out what should be modelled as the random effect in a mixed effects model. I've made this toy data which shows exam scores of...

    Started by Layo909‎, 04-17-2013 10:59 AM
    • Replies: 8
    • Views: 1,669
    04-24-2013, 03:30 PM Go to last post
  37. Develop a proof for these error estimate functions

    From what I've gathered these functions are all over statistics books, but in terms of how they came to these conclusions I'm at a loss. e_y =...

    Started by Tarvish‎, 04-24-2013 02:11 PM
    • Replies: 2
    • Views: 1,141
    04-24-2013, 02:40 PM Go to last post
  38. Comparing Samples - How to statistically analyse

    I am investigating an intervention and would like to know how to compare samples before and after the intervention. Usually I would just use a paired...

    Started by iinger‎, 04-24-2013 11:45 AM
    • Replies: 2
    • Views: 1,264
    04-24-2013, 01:21 PM Go to last post
  39. Should i use Chi square or other tests?

    Supposed I have a data like this: ---------------Healthy----Sick---- Smoker----------100------90----- Nonsmoker-------250-----260----- (100...

    Started by vivian88‎, 04-23-2013 04:31 AM
    • Replies: 5
    • Views: 1,501
    04-24-2013, 02:33 AM Go to last post
  40. Computer project statistics help

    Hi all, I am doing a computer project regarding the NHL and the statistics regarding teams that have won the Stanley Cup with 50+ wins. I am...

    Started by blind527‎, 04-22-2013 04:35 PM
    • Replies: 1
    • Views: 1,350
    04-24-2013, 01:20 AM Go to last post
  41. Sales Dispersion analysis

    I am having branchwise monthwise sales data for 12 months & the target for next 12 months. Now how to do dispersion analysis of this.

    Started by narendra1302‎, 04-23-2013 07:02 AM
    • Replies: 1
    • Views: 920
    04-24-2013, 12:08 AM Go to last post
  42. SOS for my dissertation!!!!!!!!

    hello guys. i have a huge problem. im a postgraduate student and I am doing my dissertation because in 10 days i have to submit it. generally, i am...

    Started by fel‎, 04-23-2013 07:59 PM
    • Replies: 1
    • Views: 1,127
    04-23-2013, 08:50 PM Go to last post
  43. Post Statistics Help Much Appreciated

    Hi, I'm revising for my upcoming exam and I have pastpapers but they don't give us the answers and I am unsure whether I have two questions right and...

    Started by fifi3006‎, 04-22-2013 03:59 PM
    chi, statistics, variance
    • Replies: 6
    • Views: 1,289
    04-23-2013, 07:03 PM Go to last post
  44. Calculating prediction equation from odds ratio

    I have a homework problem involving income levels and presidential prediction. I am given my log odds (R=republican, I=independent, D=democrat;...

    Started by jhartsho‎, 04-22-2013 07:43 PM
    • Replies: 2
    • Views: 1,581
    04-23-2013, 07:49 AM Go to last post
  45. Normal looking data is non-normal.

    Hi there Talk Stats, this is my first post here, and this is the first time I am working with non-normal data, so bare with me if I format my...

    Started by Freaking-Pingo‎, 04-23-2013 01:50 AM
    • Replies: 4
    • Views: 1,472
    04-23-2013, 03:07 AM Go to last post
  46. t-test. Are the values significant?

    Hi, Please help-totally stuck and can't proceed with my research paper. Read many related articles, however still struggle to understand. I...

    Started by deto4ka‎, 04-22-2013 05:55 AM
    • Replies: 1
    • Views: 1,645
    04-23-2013, 12:55 AM Go to last post
  47. Differences in how Observed Test Statistic (OTS) is calculated?

    So Im studying for a final exam and Ive noticed that my teacher has calculated the observed test statistic differently in a couple examples, giving...

    Started by pgarbs‎, 04-22-2013 09:42 PM
    • Replies: 0
    • Views: 1,498
    04-22-2013, 09:42 PM Go to last post
  48. Standard deviation of the mean difference out of Pre/Post Test Descriptive Statistics

    I have several RCT pre/post intervention studies that I am calculating Hedge's g for. All of the studies report the difference of mean and difference...

    Started by ecommon‎, 04-22-2013 09:15 PM
    change, effect size, meta-analysis, pre-post, standard deviation
    • Replies: 0
    • Views: 4,359
    04-22-2013, 09:15 PM Go to last post
  49. need help with 2nd and 3rd normalization

    Hi, I need help with 2nd and 3rd normalization I do not think I was able to grasp the concept when learning it there are two types of data i...

    Started by danz‎, 04-22-2013 11:46 AM
    • Replies: 0
    • Views: 858
    04-22-2013, 11:46 AM Go to last post
  50. Error when trying to make between level comparison of a variable

    Hi, I am presently conducting a meta-analysis in STATA and trying to compare all categories within a single column variable. The variable has...

    Started by baddeleywm‎, 04-22-2013 07:41 AM
    • Replies: 0
    • Views: 1,305
    04-22-2013, 07:41 AM Go to last post
  51. Conjoint analysis for testing causal-effect relationships?

    I am using traditional conjoint analysis to examine the relative importance of three product attributes on likelihood of purchase (rating scale 1 to...

    Started by dtumpal‎, 04-22-2013 07:39 AM
    • Replies: 0
    • Views: 1,153
    04-22-2013, 07:39 AM Go to last post
  52. Help With Hypothesis Testing In Log-Lin Model

    I am posting this here in the hopes that it will be seen quicker and I can get help quickly (which is needed considering my presentation is tomorrow...

    Started by CamHarris‎, 04-22-2013 12:56 AM
    • Replies: 0
    • Views: 1,082
    04-22-2013, 12:56 AM Go to last post
  53. Setting proper targets - which method to use

    Please delete this threat. Thank you

    Started by buddhist‎, 04-21-2013 05:56 PM
    • Replies: 0
    • Views: 1,070
    04-21-2013, 05:56 PM Go to last post
  54. Drawing T Distribution, Hypothesis Testing.

    Let me give the figures. H1:Mu<50, a simple random sample of size n=24 is obtained from a population that is known to be normally distributed. ...

    Started by PSG‎, 04-20-2013 11:05 PM
    • Replies: 1
    • Views: 1,845
    04-21-2013, 05:27 PM Go to last post
  55. Hypothesis Testing

    I am in college level statistics class and I have been struggling this this concept a lot. I have done extensive research and tried to gain help and...

    Started by hpw23‎, 04-21-2013 04:32 PM
    • Replies: 1
    • Views: 1,130
    04-21-2013, 04:49 PM Go to last post
  56. Can I compare observed and expected values simply with R-Sq.?

    I want to make comparisons between two sets of values and find how well my observed fit expected values. Observed 0.24 0.24 0.21 0.14 0.13...

    Started by JackieBadger‎, 04-21-2013 01:24 PM
    • Replies: 2
    • Views: 2,043
    04-21-2013, 03:47 PM Go to last post
  57. Comparing prices in different countries

    Hi Everybody!!! I am currently writing a master's thesis in political science, about how food prices affects the outcome of conflicts. I have some...

    Started by Shooheej‎, 04-12-2013 07:59 AM
    • Replies: 7
    • Views: 2,648
    04-21-2013, 10:44 AM Go to last post
  58. Hypothesis, Drawing T-Distribution(Question On Reading Certain Problems)

    For the most part I am able to read a question easily and determine if it's going to be right tail,left tail, or 2 tail distribution. The example in...

    Started by PSG‎, 04-21-2013 01:26 AM
    • Replies: 1
    • Views: 1,155
    04-21-2013, 09:29 AM Go to last post
  59. Computing spectral density of process

    Suppose you have a stochastic process Y_{t} = \frac{1}{2}(X_{t-1} + X_{t} + X_{t+1}). X_{t} = 0.5*X_{t-1} +w_{t}. How would you compute the...

    Started by lord12‎, 04-20-2013 05:10 PM
    • Replies: 0
    • Views: 1,227
    04-20-2013, 05:10 PM Go to last post
  60. Interaction term between ID variable and a continuous variable

    Some background information: I have a panel dataset covering a five year period using 32 different entities. Additionally I may add that the...

    Started by vad1234‎, 04-20-2013 07:22 AM
    • Replies: 0
    • Views: 1,567
    04-20-2013, 07:22 AM Go to last post

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