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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: 196,824
    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: 66,794
    09-30-2005, 09:44 AM Go to last post
  1. Scatter plot explained

    Hello, I've got my homework to explain this scatter plot. On x axis it is the recognition of school in one magazine, and on y axis it is estimation...

    Started by ifas‎, 06-02-2014 12:56 AM
    • Replies: 0
    • Views: 1,112
    06-02-2014, 12:56 AM Go to last post
  2. Which test to use?

    Hello everyone, I have three sets of data, each of which consists of hundreds of trials with 7 choices apiece. The outcome is binary - success pr...

    Started by sjoh2574‎, 06-01-2014 03:26 PM
    • Replies: 1
    • Views: 1,153
    06-01-2014, 09:06 PM Go to last post
  3. How do you know if you're making a Type I or Type II error?

    Type I and II errors seem really theoretical. In real life, how would you ever know if you're making a Type I or Type II error? Can anyone provide...

    Started by kormanik‎, 06-01-2014 04:09 PM
    hypothesis testing, statistics, type i error, type ii error
    • Replies: 3
    • Views: 889
    06-01-2014, 06:52 PM Go to last post
  4. Age groups

    How can I make age as an ordinal (categorical) variable? I work on the sample composed of Youth. 17-23, 24-30, More than 30 years old. What can I...

    Started by Rachi‎, 06-01-2014 10:47 AM
    • Replies: 5
    • Views: 1,762
    06-01-2014, 12:22 PM Go to last post
  5. Healthcare applications

    I work in healthcare and I was wondering what sort of analytics/modeling projects members of this forum are doing. I guess it would be nice to see...

    Started by swoonef‎, 06-01-2014 10:46 AM
    healthcare, logisitic regression, readmission, sql
    • Replies: 0
    • Views: 1,038
    06-01-2014, 10:46 AM Go to last post
  6. Central limit theorem and prediction theory

    Hi, My econometrics teacher asked this question a couple of days ago which is at the same time a potential question for the exam: "Why does CLT...

    Started by orsss‎, 06-01-2014 07:31 AM
    • Replies: 1
    • Views: 1,852
    06-01-2014, 09:53 AM Go to last post
  7. How can you prove normal distribution enough to use e.g. ANOVA not Kruskal Wallis?

    Hi everyone, I'm trying to produce an automated framework for choosing hypothesis tests and carrying them out. I really am new to statistics so...

    Started by Geoff‎, 05-19-2014 06:22 AM
    anova, kruksall-wallis, non parametric, normal distribution, parametric
    • Replies: 2
    • Views: 1,576
    06-01-2014, 01:50 AM Go to last post
  8. Combing Two Indexes into One Index

    I want to use two survey questions to measure satisfaction level with the following responses: Question 1: very satisfied (highest score),...

    Started by yeba‎, 06-01-2014 01:25 AM
    • Replies: 0
    • Views: 890
    06-01-2014, 01:25 AM Go to last post
  9. Confidence intervals for eta squared?

    Hello, is it possible to calculate confidence intervals for eta-squared manually? I found a paper which lists the formula for this:...

    Started by Mutak‎, 06-01-2014 01:04 AM
    confidence intervals, eta squared
    • Replies: 0
    • Views: 2,217
    06-01-2014, 01:04 AM Go to last post
  10. Evaluating differences between repeated measurements of one group to another

    I'm having difficulties understanding what type of statistical testing I need for my questions. My measurements include the following: Organism 1 ...

    Started by AdamSwansea‎, 05-31-2014 05:16 PM
    • Replies: 0
    • Views: 1,012
    05-31-2014, 05:16 PM Go to last post
  11. Which test to use?

    Hello - I think I have a fairly straight forward statistical analysis to perform, but I am really unsure which method to use. I have 2 variables...

    Started by tmorelli‎, 05-23-2014 12:33 PM
    • Replies: 1
    • Views: 1,478
    05-31-2014, 03:46 PM Go to last post
  12. Use Excel to analyze my Product characteristics to select which products will sell

    Hi - I am trying to analyze my numerous products to determine which ones are best to list in the future. Last year I listed about 13,000 products,...

    Started by Paul55‎, 05-23-2014 04:43 PM
    • Replies: 2
    • Views: 2,292
    05-31-2014, 03:37 PM Go to last post
  13. ordinal scale - rate of importance - which test to use?

    Hey All, I new here. So excuse me in case of any mistakes in posting. As for my problem, I am doing an analysis of factors that influence...

    Started by sravz_64‎, 05-24-2014 03:24 AM
    • Replies: 1
    • Views: 1,120
    05-31-2014, 03:30 PM Go to last post
  14. query in non parametric test

    If we want to see whether the variance in the temperatures in the month of June is same in two cities, (assume that the temperature is normally...

    Started by pooja10‎, 05-30-2014 04:36 AM
    • Replies: 1
    • Views: 1,089
    05-31-2014, 03:11 PM Go to last post
  15. Standard deviation of difference of means

    Hi, I am sorry of this stupid question :confused: I would like to know if it possible to calculate the standard deviation of a difference of...

    Started by Ronguru‎, 05-24-2014 04:14 AM
    standard deviation
    • Replies: 5
    • Views: 1,734
    05-31-2014, 02:49 PM Go to last post
  16. difference between 1m rolling and 1m trailing data

    Hi This is probably a basic question, but I am looking to get returns data on some investment portfolios. I need monthly discrete returns for...

    Started by barn‎, 05-30-2014 03:32 AM
    • Replies: 1
    • Views: 2,614
    05-31-2014, 02:14 PM Go to last post
  17. I need to consult your opinion! Thank you in advance!

    As a newbie in statistics i need to understand what type of statistical tests to use in my research?

    Started by Rachi‎, 05-28-2014 10:00 PM
    • Replies: 7
    • Views: 2,973
    05-30-2014, 05:42 PM Go to last post
  18. Central limit theorem and prediction theory

    Hi, My teacher for an econometrics course asked the following question and I don't know what to answer: I thought it was the other way...

    Started by John.Doe‎, 08-15-2012 09:08 PM
    • Replies: 2
    • Views: 2,068
    05-30-2014, 02:25 PM Go to last post
  19. Statistical Significance Testing

    Hello! I'm hoping for some help. I'm trying to determine if any data sets in a group are more or less significant than the others in the set at the...

    Started by StatsStudent255‎, 05-30-2014 10:38 AM
    • Replies: 1
    • Views: 819
    05-30-2014, 11:28 AM Go to last post
  20. UV Data Averages Quality?

    Hi all, Joined this forum to ask perhaps a basic question, but I hope someone will be able to help. I have two sets of data that I would like...

    Started by Blue Humour‎, 05-30-2014 03:05 AM
    • Replies: 2
    • Views: 1,021
    05-30-2014, 10:31 AM Go to last post
  21. Sample size required to detect a difference between proportions

    Hi guys, I've been having a bit of trouble with calculating a sample size to detect a difference. The question asks what sample size would be...

    Started by Reinforcements‎, 05-30-2014 08:58 AM
    • Replies: 0
    • Views: 1,044
    05-30-2014, 08:58 AM Go to last post
  22. Dealing with data where the values of variable Y depend on values of variable X

    Hi there, I've been doing some undergrad research and am confused about how to handle some of my data (and my professor doesn't know much about...

    Started by Reese‎, 05-30-2014 07:19 AM
    correlation, increasing variance, independence, regression, spearman
    • Replies: 0
    • Views: 1,389
    05-30-2014, 07:19 AM Go to last post
  23. Thumbs up Predicting count dependent variable

    I am trying to model a count dependent variable (0~60) with excessive zeros. The range of data is quite large, unbalanced and unbound, so...

    Started by garybooz‎, 05-30-2014 03:23 AM
    count dependent variable
    • Replies: 0
    • Views: 1,821
    05-30-2014, 03:23 AM Go to last post
  24. Minimum Sample Size Required

    I am a total novice...I do hope you can help! 100,000 people usually shop in Store X. But, only 50,000 people shopped in Store X in Period Y....

    Started by froggeja‎, 05-29-2014 07:58 AM
    sample size calculation
    • Replies: 0
    • Views: 605
    05-29-2014, 07:58 AM Go to last post
  25. Transforming data?

    I am regressing Volume against price of futures. My question is do I have to transform both of the data into percentage change or not? R square is...

    Started by Att‎, 05-29-2014 03:03 AM
    • Replies: 0
    • Views: 841
    05-29-2014, 03:03 AM Go to last post
  26. Post Help me

    hi to all, I need help with my homework. I am a Erasmus student and I have to write 10 pages about " Why we study descriptive statistic; what...

    Started by sylvia25‎, 05-29-2014 02:13 AM
    • Replies: 0
    • Views: 1,119
    05-29-2014, 02:13 AM Go to last post
  27. Effect of Unequal Denominator when Comparing 2 Ratios/Percentage?

    Hi all, I've been trying to find the answer for this for quite a while, but I have yet to have any luck in finding it out. Basically if we are...

    Started by glowfish‎, 05-28-2014 04:25 AM
    • Replies: 2
    • Views: 2,283
    05-29-2014, 12:57 AM Go to last post
  28. Help me out in understanding this output

    Hello, I'm new to SAS as well as forums. Kindly help me understand this simple output. Here are the two datasets dataset - emp ...

    Started by kola‎, 05-28-2014 12:38 PM
    • Replies: 5
    • Views: 1,662
    05-28-2014, 09:22 PM Go to last post
  29. Need help with Question 3 please, theres like 6 of us aruging about it.

    Q3) Does the distribution of emails between days differ between group members? Include a graphical comparison which shows the proportions on each day...

    Started by Litteltank‎, 05-28-2014 08:31 PM
    • Replies: 1
    • Views: 1,146
    05-28-2014, 08:47 PM Go to last post
  30. Statistics for model validations

    Hi. I have two models: with observed data (target model) and a generated synthetic model (output model). They are 20 by 20 cells where each cell...

    Started by sthoriginal‎, 05-28-2014 04:31 PM
    • Replies: 0
    • Views: 1,139
    05-28-2014, 04:31 PM Go to last post
  31. Help Me Please, I have No were else to turn :(:(

    So I have 3 questions to complete, please help me, I think I know what i am doing but really not 100% sure. Here is my Data The 5 vectors are...

    Started by Litteltank‎, 05-27-2014 10:33 PM
    • Replies: 2
    • Views: 1,464
    05-28-2014, 02:35 PM Go to last post
  32. Confidence of Distribution

    Hi all, say I have a known normal distribution, which was created by an experiment. Now, I take another measurement, one only, and assume this is...

    Started by stivi29‎, 05-28-2014 09:56 AM
    compare, confidence, normal distribution
    • Replies: 2
    • Views: 1,362
    05-28-2014, 11:21 AM Go to last post
  33. Comparing two groups with multiple measurements of the same variable

    Dear anyone I am monitoring symptoms (continuous scale, normally distributed) in patients two groups (one gets the treatment and the doesn’t). The...

    Started by loedrup.ab‎, 05-28-2014 09:18 AM
    • Replies: 0
    • Views: 2,575
    05-28-2014, 09:18 AM Go to last post
  34. Statistical power and confidence level?

    Hello I need help understanding why statistical power = 1-beta, doesn't a .05 significance level mean there it is 95% confidence level (1-a) that the...

    Started by dudeman74‎, 05-27-2014 03:21 PM
    • Replies: 2
    • Views: 2,003
    05-27-2014, 05:33 PM Go to last post
  35. Split plot w/factorial design vs three way anova?

    I could really appreciate some guidance on what statistics I should use for a field study. I have three site temperature types - cold, medium,...

    Started by statsCanBeConfusing‎, 05-24-2014 09:49 AM
    • Replies: 1
    • Views: 1,744
    05-27-2014, 07:10 AM Go to last post
  36. Y~N(1,0.5) and W= Y^2, what is the moment generating function of W?

    I think it's something to do with the Non central Chisquared distribution but I'm not sure how to use it and derive the mgf of W? Would someone show...

    Started by Everisingstar‎, 05-26-2014 10:38 AM
    mgf, noncentral chisquared
    • Replies: 2
    • Views: 1,616
    05-27-2014, 03:40 AM Go to last post
  37. Krippendorff KALPHA help!?

    Hi, I'm currently undertaking a project which requires content analysis of US print press in order to explore whether international terror events are...

    Started by ChloeEdin‎, 03-20-2014 09:42 AM
    alpha, content analysis, kalpha, krippendorff, spss
    • Replies: 2
    • Views: 4,471
    05-27-2014, 03:39 AM Go to last post
  38. Normality of Demographic variables

    Hi, for the study having two sets of variables : 1. measured demographic 2....

    Started by mohita_m‎, 05-26-2014 01:44 AM
    • Replies: 1
    • Views: 1,249
    05-26-2014, 05:56 AM Go to last post
  39. Unhappy Having some problem with simple least squares regression qs

    Hi, this is fairly simple stats stuff but I'm completely lost on how we can get R^2 and SSR from the data we have. Would appreciate any pointers here...

    Started by queen6suited‎, 05-24-2014 09:40 AM
    • Replies: 1
    • Views: 1,451
    05-25-2014, 04:59 PM Go to last post
  40. Question Showing difference of two group means

    Hi all, Im trying to determine how best to show the differences between to groups and their study strategies, I have run independent means to...

    Started by mrmagoo‎, 05-25-2014 03:19 AM
    • Replies: 1
    • Views: 965
    05-25-2014, 08:39 AM Go to last post
  41. 2 (Easy) Regression Questions

    Hi guys. I just joined Talk Stats. So I recently just returned to school after being hit by Crohns' Disease for a year, and I was wondering if you...

    Started by rollnrocking‎, 05-24-2014 09:38 PM
    • Replies: 0
    • Views: 3,081
    05-24-2014, 09:38 PM Go to last post
  42. statistical significance betwee 2 groups

    Hello all, I'm trying to analyze data from 2 different groups for statistically significant differences and could definitely use some help here....

    Started by zikomo‎, 05-24-2014 06:59 AM
    • Replies: 1
    • Views: 1,000
    05-24-2014, 07:41 AM Go to last post
  43. chi-square and multiple testing

    Hi, I want to compare survey responses for a particular survey questions between one year and the next - to see if there is a statistically...

    Started by statslearner100‎, 05-21-2014 12:59 PM
    chi-square help, multiple testing, survey analysis
    • Replies: 8
    • Views: 1,944
    05-23-2014, 02:42 PM Go to last post
  44. Paper Aeroplane Experimental Design

    Hi All, I am planning an experiment to test 2 paper airplane designs. For each experiment, I consider factors; plane design, paper type, drag,...

    Started by viktus‎, 05-22-2014 04:25 PM
    • Replies: 7
    • Views: 1,668
    05-23-2014, 02:30 PM Go to last post
  45. Parametric or non-parametric test?

    Hi there, thanks in advance for any help you can give. I need to perform a correlation test between a parametric data set and a non-parametric data...

    Started by tfm09‎, 05-21-2014 05:49 AM
    • Replies: 9
    • Views: 1,644
    05-23-2014, 09:57 AM Go to last post
  46. Sensitivity/Specificity: determining confidence intervals for a small sample size

    I'm conducting a study to determine the validity of a diagnostic test, by comparing its results to a reference standard. The variables I'm dealing...

    Started by figueiredo.analucia‎, 05-23-2014 06:59 AM
    confidence interval, sensitivity, small sample size
    • Replies: 0
    • Views: 2,403
    05-23-2014, 06:59 AM Go to last post
  47. Question on standard error

    I'm reading "Statistics in Plain English" by Tim Urdan and I'm really enjoying it, but this part is causing me alot of confusion: My...

    Started by statnewb00‎, 05-22-2014 02:12 PM
    • Replies: 3
    • Views: 1,258
    05-23-2014, 01:48 AM Go to last post
  48. computing maximum likelihood for GBM models

    I am running some analyses with a group of models to make a final ensemble of predictions. I am using GBM, GAM and GLM. I can calculate AIC value for...

    Started by manuelad‎, 05-22-2014 09:56 AM
    • Replies: 0
    • Views: 1,099
    05-22-2014, 09:56 AM Go to last post
  49. Reporting a backward elimination regression

    Hi I wondered if anyone could tell me how to report a backward elimination regression (i.e. how much information to include). The model has taken...

    Started by l_sully‎, 05-22-2014 09:48 AM
    • Replies: 0
    • Views: 1,893
    05-22-2014, 09:48 AM Go to last post
  50. Which test to choose (LIKERT scale/ and mix of ordinal data)

    Hello, Luckily I found this forum, I need some confirmation for choices I made regarding the tests I am willing to do for my master thesis. My...

    Started by Sempah‎, 05-22-2014 04:02 AM
    • Replies: 0
    • Views: 892
    05-22-2014, 04:02 AM Go to last post
  51. Calculating SD for data with many zeros

    Hi all, I have multiple datasets with lots of zeros. Some are counts, others are percentages, but none of them can have negative values. When...

    Started by Ricardo‎, 05-21-2014 08:42 PM
    • Replies: 9
    • Views: 4,249
    05-21-2014, 11:11 PM Go to last post
  52. Power Analysis and its intepretation

    Dear all, This is a real study and with minimal statistics background I am helpless. Recently I am doing a research study. However, when doing...

    Started by fai0204‎, 05-21-2014 05:32 PM
    • Replies: 1
    • Views: 1,123
    05-21-2014, 08:37 PM Go to last post
  53. 4 treatment types, four possible outcomes, and ran experiment 3 times

    I am circling through choices of analyzing. I have a ran the experiment 3 times and the same similar numbers come up for each experiment. The...

    Started by Blaize‎, 05-21-2014 07:07 PM
    • Replies: 0
    • Views: 1,262
    05-21-2014, 07:07 PM Go to last post
  54. Post I need help calculating the Tukey's HSD statistic (two way anova 25x2)

    hello:) I need to calculated the Tukey's statistic for 25x2 and 200 degrees of freedom please....I'm confused determine the value of k to...

    Started by thenungs‎, 05-21-2014 12:14 PM
    • Replies: 0
    • Views: 1,189
    05-21-2014, 12:14 PM Go to last post
  55. Volatility of Currencies - Use F-test?

    I've been given a question to compare given data sets of monthly exchange rates (over a 10 year period so the sample size is 120) of 4 different...

    Started by asdfqwer‎, 05-21-2014 11:08 AM
    • Replies: 0
    • Views: 1,866
    05-21-2014, 11:08 AM Go to last post
  56. Is only 1 item in 1 factor possible (factor analysis)

    I have three factors, of which factor 1 and 2 have several items loading on them. However, factor three has only 1 item. Is this possible or is it...

    Started by Fehof‎, 05-21-2014 08:58 AM
    factor analysis, items, loading
    • Replies: 0
    • Views: 1,127
    05-21-2014, 08:58 AM Go to last post
  57. Which Statistical model to use ?

    Dear all, I am new to statistics and i have a confusion. I have one dependent variable (y) and multiple independent variable (xi). However, the...

    Started by Questionwhat‎, 05-21-2014 05:33 AM
    • Replies: 1
    • Views: 1,194
    05-21-2014, 07:20 AM Go to last post
  58. Question tool to use for Datamining

    Hi Which statistical tool will be the best for MIS and data mining for data running into a million customers. As the need will be continuous, can...

    Started by LINDAHENERY‎, 01-21-2014 02:10 AM
    • Replies: 1
    • Views: 922
    05-21-2014, 06:37 AM Go to last post
  59. Null Hypothesis

    Hey, I am having troubling trying to figure out how I would write this for the null and alternative hypothesis. Any help would be appreciated ...

    Started by Macroguy‎, 05-14-2014 08:33 AM
    • Replies: 7
    • Views: 2,127
    05-20-2014, 09:59 PM Go to last post
  60. Mean and SD of proportions

    I have done a search of the forum with no luck. I wish to determine the density per hectare of a particular plant and I have sampled 37 areas each of...

    Started by ColinD‎, 05-14-2014 06:19 PM
    • Replies: 1
    • Views: 1,286
    05-20-2014, 05:10 PM Go to last post

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