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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: 197,237
    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: 67,003
    09-30-2005, 09:44 AM Go to last post
  1. Please help! (SEM-related)

    I am trying to assess the associations between my control variables (covariates) and 4 latent constructs, so that I can decide which ones to include...

    Started by CCmomof5‎, 04-01-2014 10:00 PM
    • Replies: 3
    • Views: 1,954
    04-02-2014, 11:38 PM Go to last post
  2. Paired T Test or One Way ANVOA

    Hi, I'm trying to analyse data from a small sample size (10 people) but not sure which test I should use. my data is based on having asked the...

    Started by midnitz7‎, 04-02-2014 03:35 PM
    • Replies: 1
    • Views: 870
    04-02-2014, 03:41 PM Go to last post
  3. Zero confidence in stats!

    Studying for exam in SPSS now and i have just lost all confidence in stats. The question is " compare the rates of microalbuminuria at 4 years in...

    Started by nm90‎, 04-02-2014 07:24 AM
    • Replies: 3
    • Views: 1,830
    04-02-2014, 10:25 AM Go to last post
  4. New to stats, need help

    A random sample of 15 hourly wage of waiters was drawn from a normal population. The same mean and sample standard deviation were x=149 and s=6.75....

    Started by Averagepaul‎, 04-02-2014 04:38 AM
    • Replies: 1
    • Views: 1,295
    04-02-2014, 07:54 AM Go to last post
  5. Re: Adjustment for multiple comparisons

    Hello ! Here is my problem. I am calculating the correlations between two sets of data from the same samples (relative abundance of bacteria vs...

    Started by Koblenz‎, 04-02-2014 03:44 AM
    • Replies: 0
    • Views: 947
    04-02-2014, 03:44 AM Go to last post
  6. Estimating Closing Pirce with 95% Confidence on Excel

    On March 10 2014, S&P Index stood at 1841.13 and Johnson & Johnson was at 92.81. The next week on March 17, 2014 S&P 500 stood at 1866.52. Estimate...

    Started by dweiner92‎, 04-01-2014 08:54 PM
    • Replies: 1
    • Views: 1,023
    04-01-2014, 08:58 PM Go to last post
  7. Interaction Effects

    Suppose I have a data set with Two Factors: F1 - 3 Levels; F2 - 4 Levels We attempted to perform 3 reps for each combination, but were unable to...

    Started by simplemts‎, 04-01-2014 06:22 PM
    • Replies: 0
    • Views: 1,053
    04-01-2014, 06:22 PM Go to last post
  8. Type 1 error - any help appreciated

    Hey guys, i'm new here but have a feeling i'll be sticking around for quite a while ... Basically i have a question regarding type 1 error. I've...

    Started by heshteck‎, 04-01-2014 08:14 AM
    • Replies: 4
    • Views: 1,963
    04-01-2014, 06:15 PM Go to last post
  9. Std error of the estimate!

    Basically my question is "in an analysis, if you fitted two models with very different values of R-squared. would you expect the Std. error of the...

    Started by nm90‎, 04-01-2014 12:59 PM
    • Replies: 4
    • Views: 1,561
    04-01-2014, 04:18 PM Go to last post
  10. Confounding vs. Extraneous Variables?

    I need to know the difference between these two in a psychological research paper I am studying, in which there are two levels of independent...

    Started by amberlowings‎, 04-01-2014 05:02 AM
    confounding variable, extraneous variable, psychology
    • Replies: 3
    • Views: 2,557
    04-01-2014, 03:09 PM Go to last post
  11. Question Need Help with finding out influence of value on total

    Hi I am new here and trying to learn statistics (again?). So i guess I am going to ask some stupid questions :). Here is my 1st one I have a data...

    Started by theniks‎, 03-23-2014 05:35 AM
    • Replies: 1
    • Views: 1,346
    04-01-2014, 02:47 PM Go to last post
  12. How does age/sex influence a repeated measure variable (lab results)?

    I'm having huge trouble finding the right statistical test for the job. I want to check if age, sex, duration of illness etc. has an influence on...

    Started by msmyla‎, 04-01-2014 02:03 PM
    • Replies: 0
    • Views: 893
    04-01-2014, 02:03 PM Go to last post
  13. Candidate selection help to find fairest mechanism to use

    Hello all, Seeking some guidance to help me as I work out the score of a group of candidates for a set of roles I am hiring for. They've had to...

    Started by phillpaige‎, 04-01-2014 11:46 AM
    analysis, average, mode
    • Replies: 0
    • Views: 970
    04-01-2014, 11:46 AM Go to last post
  14. Interpreting Wilcoxon-signed rank results question

    Hello all, I am struggling to understand and interpret the Wilcoxon-signed rank test data on my (girlfriend's) assignment, if someone could clear...

    Started by floydyb3‎, 03-31-2014 12:06 PM
    • Replies: 5
    • Views: 2,354
    04-01-2014, 08:24 AM Go to last post
  15. Equality of variances in SPSS

    Can we not perform a normal F test for homogenity of variances in SPSS? Is Levene's test the only way?

    Started by r_vs‎, 04-01-2014 12:49 AM
    spss
    • Replies: 0
    • Views: 999
    04-01-2014, 12:49 AM Go to last post
  16. normal distribution help

    Reports that the height for the population of adult men is normally distributed with a mean of 69.5” with a standard deviation of 2.4”; for the...

    Started by john108‎, 03-31-2014 03:56 PM
    • Replies: 1
    • Views: 3,850
    03-31-2014, 04:03 PM Go to last post
  17. Exclamation Determining significance of proportions

    Hey everyone, Quick question I was hoping you guys could help me with. Basically, I've done a test where from a cohort of 112 people I've...

    Started by motiv3‎, 03-31-2014 03:34 PM
    • Replies: 0
    • Views: 1,276
    03-31-2014, 03:34 PM Go to last post
  18. Normal Distribution question

    Assume a beverage filling company is supposed to fill beer bottles with 330ml beer. The machine can be adjusted to any filling volume with a...

    Started by youkie‎, 03-31-2014 11:01 AM
    • Replies: 0
    • Views: 972
    03-31-2014, 11:01 AM Go to last post
  19. how do i approach this problem?

    how do i approach this problem? thanks in advance.

    Started by titanlord1‎, 03-26-2014 02:19 PM
    2 Pages
    1 2
    • Replies: 23
    • Views: 3,757
    03-31-2014, 08:37 AM Go to last post
  20. a question in uniform distribution

    suppose X1,…,Xn be random sample of U(0,θ) distribution. if X(n) be largest order statistics of sample, and V=nX¯/X(n), how can I calculate...

    Started by hadiSanji‎, 03-30-2014 08:36 PM
    statistic
    • Replies: 1
    • Views: 1,641
    03-30-2014, 11:15 PM Go to last post
  21. Help Me Pretty PEAS!!

    Hello big boys and girls! Got a killer assignment this week! I'm a full grown engineer but don't know any stats! :shakehead Myself and some...

    Started by helpmyazzprettyplz‎, 03-30-2014 12:20 AM
    • Replies: 3
    • Views: 1,536
    03-30-2014, 04:57 PM Go to last post
  22. Need help with CA

    Hi, I am very new to this forum and new to statistics so forgive me my ignorance. Can anybody help me with my CA? I am attaching 4 questions which...

    Started by MariaStat‎, 03-30-2014 11:51 AM
    • Replies: 1
    • Views: 1,351
    03-30-2014, 12:08 PM Go to last post
  23. Need help with CA

    Hi, I am very new to this forum and new to statistics so forgive me my ignorance. Can anybody help me with my CA? I am attaching 4 questions which...

    Started by MariaStat‎, 03-30-2014 12:06 PM
    • Replies: 0
    • Views: 1,179
    03-30-2014, 12:06 PM Go to last post
  24. anyone know how to do this? im stumped.

    thanks in advance.

    Started by titanlord1‎, 03-29-2014 07:09 PM
    • Replies: 7
    • Views: 1,630
    03-30-2014, 10:44 AM Go to last post
  25. Main Effects & Interaction Effects

    I have 3 factors: F1 = 2 Fixed levels; F2 = 2 Fixed Levels; F3 = 2 Fixed Levels. I am given the pouplation means, not sample means, for all...

    Started by simplemts‎, 03-29-2014 09:52 PM
    • Replies: 2
    • Views: 1,007
    03-30-2014, 01:52 AM Go to last post
  26. 95% Confidence Intervals

    Hey, I've been searching the web frantically for the last hour trying to find out how you calculate the 95% CI for a 2x2 Within Group ANOVA and a...

    Started by Kakazam‎, 03-29-2014 05:53 PM
    • Replies: 2
    • Views: 1,246
    03-29-2014, 06:59 PM Go to last post
  27. Which Statistical Test to Use?

    I am doing a research project in which I have collected variables on two separate groups. One group uses a self testing laboratory machine which I...

    Started by Herkules44‎, 03-29-2014 04:56 PM
    correlation, regression, t-test, which test
    • Replies: 0
    • Views: 862
    03-29-2014, 04:56 PM Go to last post
  28. Bayes Probability.

    The probability that an insured individual will give rise to no claims next year is e^-θ, where θ varies by individuals according to the density...

    Started by Davie322‎, 03-29-2014 05:05 AM
    • Replies: 4
    • Views: 1,706
    03-29-2014, 02:56 PM Go to last post
  29. Change scores that influence each other, how to tell what's going on?

    Hi I had a question about comparing change scores. My study includes a stressor, So I have Timepoint 1 (baseline) TP2 (Stress Response ) and TP3...

    Started by LauraGH‎, 03-29-2014 01:56 PM
    • Replies: 0
    • Views: 1,049
    03-29-2014, 01:56 PM Go to last post
  30. R Kolmogorov-Smirnov test

    Hi, I'm a little confused about this output of a ks.test in R: > ks.test( scale( runif(30)), "pnorm") One-sample Kolmogorov-Smirnov test ...

    Started by staminam‎, 03-29-2014 07:37 AM
    • Replies: 4
    • Views: 2,447
    03-29-2014, 01:03 PM Go to last post
  31. Question Assigning numerical ranks to ordinal question categories for analysis purposes

    Hello all, I am working on a dissertation on parent involvement types. My data is derived from a self-administered survey. I wrote responses to...

    Started by GDP9‎, 03-29-2014 09:42 AM
    • Replies: 0
    • Views: 1,342
    03-29-2014, 09:42 AM Go to last post
  32. using descriptive statistics for very large performance analysis

    Supervisors grades the performance of our international associates every year (located in twelve countries), in scores from 0 to 5. The means for the...

    Started by parsec2011‎, 03-27-2014 01:31 PM
    • Replies: 4
    • Views: 1,099
    03-29-2014, 07:16 AM Go to last post
  33. Cool Regression Analysis with Time Series Data

    Hey guys, I have some monthly time series data and I'm trying to perform regression analysis on it. I'm just wondering, if I have a few insignificant...

    Started by EyhSteve‎, 03-28-2014 03:12 PM
    parameters, regression, time series
    • Replies: 1
    • Views: 1,377
    03-28-2014, 04:12 PM Go to last post
  34. Dissertation Stats Help!

    Im Currently Doing My Dissertation, In Sports Coaching. I have questioned 13 youth football players. Each gave a rating between 0-5 for five...

    Started by JonnyJames1‎, 03-28-2014 01:51 PM
    • Replies: 5
    • Views: 2,032
    03-28-2014, 04:05 PM Go to last post
  35. Hypothesis Test - is this correct?

    Im trying to do a hypothesis test for whether our sample has an SAT average of 1200 or higher: Use ĩ to represent the true mean SAT score of our...

    Started by sk56‎, 03-28-2014 01:34 AM
    • Replies: 1
    • Views: 919
    03-28-2014, 03:17 PM Go to last post
  36. Statistic Test...Likert Scales?

    Hi guys, I don't have much experience crunching data on Likert or Likert Type scales. For this question, I have to look at individuals with a...

    Started by gene2420‎, 03-28-2014 12:32 PM
    • Replies: 0
    • Views: 1,230
    03-28-2014, 12:32 PM Go to last post
  37. Question on Data Transformation

    Greetings all! I have 3-predictor variables, say x,y and z. Using Shapiro-Wilk, I find that x and y are not normal and z is pretty normal. I...

    Started by jtrubisz‎, 03-28-2014 09:55 AM
    • Replies: 0
    • Views: 741
    03-28-2014, 09:55 AM Go to last post
  38. What test to determine if 5 years of population data has a trend?

    Hello. I have population data for 5 years for several species of birds and I would like to know whether the populations are growing, staying...

    Started by dlk2143‎, 03-27-2014 11:42 PM
    count data, population, time series, trend
    • Replies: 1
    • Views: 1,222
    03-28-2014, 07:52 AM Go to last post
  39. Solving a permutations-combinations problem

    Hi Could you please explain to me how to do the following question? "There are 12 beads in an urn, where 5 of them are blue, 4 are red and 3 are...

    Started by ajlovat‎, 03-27-2014 08:28 AM
    combination, permutation combination
    • Replies: 3
    • Views: 1,812
    03-28-2014, 06:02 AM Go to last post
  40. APA reporting single main effects

    Hi, thank you in advance for your help! I performed a repeat measures ANOVA on my data; the interaction was significant so I performed a single...

    Started by fellis‎, 03-28-2014 05:23 AM
    • Replies: 0
    • Views: 1,549
    03-28-2014, 05:23 AM Go to last post
  41. Mean split vs. median split

    Hi, Could anyone please explain to me what the exact difference between Mean split and median split? And which one much recommended? Many...

    Started by ghada8888‎, 03-26-2014 03:53 PM
    • Replies: 6
    • Views: 9,891
    03-27-2014, 03:57 PM Go to last post
  42. What to do with missings?

    I am computing a scale 'political participation' out of 7 questions that measure political paritcipation. For example: I voted in the last elections...

    Started by Annvdb‎, 03-27-2014 12:22 PM
    • Replies: 1
    • Views: 1,387
    03-27-2014, 12:34 PM Go to last post
  43. Not randomized sampling

    Hello all, I want to make a small research. I want to compare the price of gluten free food products to similar "regular" products. The thing I...

    Started by Yankel‎, 03-27-2014 04:09 AM
    • Replies: 5
    • Views: 1,680
    03-27-2014, 12:03 PM Go to last post
  44. Multinomial logistic regression categorial scale question

    I have data about political participation where respondents answers questions 7 (yes or no) that indicate some form of political participation. for...

    Started by Annvdb‎, 03-27-2014 05:05 AM
    multinomial regression
    • Replies: 1
    • Views: 889
    03-27-2014, 05:30 AM Go to last post
  45. How to calculate max/min scales on a scatter plot

    Good morning! I have 3 log scatter plots that I want to establish smooth maximum and minimum lines. What is the usual mathematical method to do...

    Started by ExpertAlmost‎, 03-25-2014 12:04 AM
    maximization, scale development, scatter plot
    • Replies: 1
    • Views: 1,067
    03-26-2014, 09:30 PM Go to last post
  46. ANOVA for survey results

    I have 5 survey questions where participants gave a response from 1 to 10. Can I use a simple ANOVA test to determine if the mean result of at...

    Started by pickslides‎, 03-25-2014 01:41 PM
    • Replies: 3
    • Views: 2,388
    03-26-2014, 07:51 PM Go to last post
  47. Minimizing impact of age variable

    Hi So I'm working with a health outcomes dataset for an entire state. The dataset is also broken up into groups by location within the state. ...

    Started by eclarson‎, 03-18-2014 08:24 AM
    normalization
    • Replies: 3
    • Views: 1,416
    03-26-2014, 03:02 PM Go to last post
  48. Simple Fishers/Chi Advice Needed!

    Hello there, I have a 2x4 table with nominal data (the columns are simply YES/NO, the rows are four categories) Category A: 7, 13 Category B:...

    Started by nylon88‎, 03-26-2014 07:35 AM
    • Replies: 2
    • Views: 1,369
    03-26-2014, 02:55 PM Go to last post
  49. Abnormal Interaction Effect

    Hey people, After I have conducted an ordered logistic regression with a DV and two IVs, I get the following result: Two main effects (IV1 on DV,...

    Started by Zloy‎, 03-26-2014 02:13 PM
    • Replies: 0
    • Views: 1,041
    03-26-2014, 02:13 PM Go to last post
  50. determine sample size for data series

    Hi, I'm trying to determine if a sample size is large enough for an estimation test. Based on historical numbers from 2002 to 2012 and summarized by...

    Started by podarum‎, 03-26-2014 09:35 AM
    • Replies: 0
    • Views: 1,287
    03-26-2014, 09:35 AM Go to last post
  51. Fisher's Exact Test

    Hello,:wave: I'm currently a doctoral candidate in wildlife ecology. I'm analyzing habitat selection data for bullsnakes collected over three...

    Started by ReptileJK‎, 05-12-2006 02:35 PM
    • Replies: 8
    • Views: 8,608
    03-26-2014, 07:32 AM Go to last post
  52. Intervention Evaluation and Regression Discontinuity Design

    Dear All, I would be very grateful for some guidance, I need to conduct an evaluation of a new intervention programme. I would ideally like...

    Started by LGF‎, 03-26-2014 06:23 AM
    • Replies: 0
    • Views: 1,045
    03-26-2014, 06:23 AM Go to last post
  53. Do I need to correct for multiple comparisons in paired t-test ?

    This is an EEG experiment, and has three blocks showing different images which are supposed to change the emotional state of the participant....

    Started by mark_74‎, 03-23-2014 10:22 PM
    • Replies: 3
    • Views: 2,654
    03-26-2014, 05:25 AM Go to last post
  54. Problem with variables transformation

    Hello, This may be quite a stupid question, but I cannot find a solution anywhere, so maybe you would be able to help. So I have three...

    Started by peter t.‎, 03-25-2014 08:39 PM
    • Replies: 2
    • Views: 1,566
    03-26-2014, 05:16 AM Go to last post
  55. Problems with Moderating effect on 2 IVs

    Hello to everyone, I have some problems with my diploma work and I really need your help. I am trying to measure a moderating effect on my...

    Started by tupama6ina‎, 03-26-2014 03:41 AM
    • Replies: 0
    • Views: 1,154
    03-26-2014, 03:41 AM Go to last post
  56. Thumbs up Factor analysis followed by cluster analysis ( time sensitive)

    Hi everyone, I have done a principal component analysis using SPSS and now have 3 components. 2 components have 4 items in the sub scale and 1...

    Started by LilyP‎, 03-26-2014 01:06 AM
    • Replies: 0
    • Views: 1,156
    03-26-2014, 01:06 AM Go to last post
  57. Post Basic Statistics Question for Gaming Achievements

    I was doing a quick project for fun and bragging rights that is related to computer games and achievements. I am provided limited data, and wasn't...

    Started by JimTanis‎, 03-24-2014 09:49 PM
    • Replies: 4
    • Views: 1,565
    03-25-2014, 08:51 PM Go to last post
  58. Single Factor ANOVA Guidelines

    Hello, I need to understand something regarding ANOVA test. Given the data can they be paired or unpaired or only either of the two? Take this...

    Started by bigbob‎, 03-25-2014 11:15 AM
    • Replies: 3
    • Views: 2,381
    03-25-2014, 05:39 PM Go to last post
  59. Fieller-Hinkley Ratio of Correlated Random Variables: Question On Applying Theory

    I am a senior in college writing a thesis analyzing and critiquing government income transfer programs, such as SNAP (food stamps). Here is my...

    Started by GOVT POLICY‎, 03-25-2014 04:35 PM
    distribution, hinkley, homeowrk, ratio
    • Replies: 0
    • Views: 997
    03-25-2014, 04:35 PM Go to last post
  60. homework question

    working a problem where a drug store owner suspects 5% still buy film. she wants to discontinue selling film. she keeps track of the number of...

    Started by stat-‎, 03-25-2014 08:59 AM
    • Replies: 3
    • Views: 1,184
    03-25-2014, 01:27 PM Go to last post

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