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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: 200,091
    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: 68,408
    09-30-2005, 09:44 AM Go to last post
  1. Wink $60 - tutor wanted

    $60 an hour. R code Logistic and Poisson Regression Central Limit Theorem ANOVA Single, two pop tests Simple and Multiple Linear Regression...

    Started by duval‎, 12-02-2011 04:14 PM
    3 Pages
    1 2 3
    • Replies: 36
    • Views: 8,772
    12-03-2011, 01:44 PM Go to last post
  2. < or > minus numbers

    If I wished to say everyone who scored between -100 and -10 was virtually blind, which one of these statements is correct; 1. Everyone who scored...

    Started by Toivo‎, 05-07-2017 12:55 PM
    • Replies: 0
    • Views: 1,037
    05-07-2017, 12:55 PM Go to last post
  3. "A Gnarly Skewed Data Set..."

    For an assignment, I am to find and analyze an extremely skewed data set. However, I'm having trouble simply finding one. If someone could direct...

    Started by melton.ryan‎, 02-27-2011 10:56 PM
    • Replies: 0
    • Views: 2,275
    02-27-2011, 10:56 PM Go to last post
  4. "at least probabilities"

    Okay, I've been struggling with this problem for over two hours and I'm continuing to get more confused. Any advice would be great. Here's the...

    Started by Tracy‎, 03-22-2013 10:24 AM
    • Replies: 1
    • Views: 3,050
    03-22-2013, 10:39 AM Go to last post
  5. "averaging" standard deviations

    Hello, I've been given the mean and standard deviation of many sets of the same measurement (bead size). So, I basically have a list of means and...

    Started by mc244‎, 02-08-2011 02:55 PM
    averaging averages, bell curve, standard deviation
    • Replies: 2
    • Views: 4,471
    02-08-2011, 04:07 PM Go to last post
  6. "chi-square test statistic"

    Hello everyone, Maybe someone can help me with this. I'm having trouble understanding (intuitively) how/why the "chi-square test statistic" is...

    Started by auditor‎, 11-26-2009 10:55 PM
    • Replies: 3
    • Views: 2,789
    12-01-2009, 02:16 AM Go to last post
  7. "Combined" Means and Variances?

    Hi everyone. This is my first stat assignment of the semester and I am already confused. I'm not sure what my prof is asking. I will reproduce...

    Started by stud40111‎, 09-11-2010 12:13 PM
    • Replies: 8
    • Views: 7,595
    09-13-2010, 08:07 PM Go to last post
  8. "Conditional chis square test of independence"

    I am studying for comps (my life is complete):shakehead and I ran into a test that I had not heard of it. Or a variation of one anyhow. It has a...

    Started by noetsi‎, 08-12-2012 01:39 PM
    • Replies: 2
    • Views: 1,983
    08-12-2012, 04:35 PM Go to last post
  9. "Easy" regression/hypothesis test questions

    Dear community, I'm having trouble with some basic regression questions. 1) Test the null H0: Intercept = 0. If -95% confidence interval =...

    Started by imiyakawa‎, 10-25-2010 08:24 PM
    • Replies: 3
    • Views: 5,428
    10-25-2010, 11:22 PM Go to last post
  10. "Frequency distribution of numerous variances"

    I am working on a homework assignment from a very vague, poor teacher. I flipped 20 coins, measured the amount of heads and so forth, and repeated...

    Started by trogtothedor‎, 10-11-2010 05:57 PM
    • Replies: 1
    • Views: 2,114
    10-11-2010, 05:59 PM Go to last post
  11. "Higher" log-lin model produces worse fit?

    Hi! I would really appreciate some pointers on this: a log-linear model that produces better fit with fewer terms. E.g. in a 3D scenario I...

    Started by maja_z‎, 12-02-2010 06:05 PM
    • Replies: 0
    • Views: 2,203
    12-02-2010, 06:05 PM Go to last post
  12. "independent of" vs "mutually exclusive"

    Hi, I am a stats newbie. Sorry about asking this trivial question. Say I have a 2 x2 contingency table. The categories defining rows and...

    Started by kevinoisac‎, 07-27-2011 10:36 AM
    • Replies: 4
    • Views: 7,719
    07-27-2011, 04:03 PM Go to last post
  13. "Inference" under Complete Census

    Is there such a thing as inference under a complete census, or is this a logical nonsequitur? Follow-up question... Say I wish to model a...

    Started by Char‎, 06-18-2008 09:42 AM
    • Replies: 1
    • Views: 2,301
    06-18-2008, 12:48 PM Go to last post
  14. "is men more responsible than women" how to construct hypothesis.

    "Are men more responsible than women"* two qualitative variables: men/women responsibility: yes/no i would like to test if men are more...

    Started by veddum‎, 05-17-2012 06:06 AM
    • Replies: 0
    • Views: 1,751
    05-17-2012, 06:06 AM Go to last post
  15. "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: 2,448
    10-18-2014, 09:09 AM Go to last post
  16. "make an analysis of your own choice"

    working on an assignment about jobsatisfaction, got the variables: motivation, sex, department number, responsibility, job function, days of illness,...

    Started by veddum‎, 05-15-2012 04:55 PM
    • Replies: 6
    • Views: 4,103
    05-16-2012, 05:04 PM Go to last post
  17. "Mann-Whitney U-test" application on 2 samples which are given the same treatment

    suppose, in a diploma school of business Management there are 400 students, a sample 27 students with say 17 boys and 10 girls, are obtained using...

    Started by KitchenViking‎, 08-22-2012 05:32 AM
    • Replies: 2
    • Views: 1,497
    08-22-2012, 06:52 AM Go to last post
  18. "Natural Log Transformation" of some items in SPSS?

    Hello everyone, I did Sperman's Correlations on a couple of items (let's call them 1, 2, 3, 4, 5), but it gave me the correlations for item 2,...

    Started by gonecrazy‎, 10-28-2011 08:04 AM
    • Replies: 0
    • Views: 3,146
    10-28-2011, 08:04 AM Go to last post
  19. "Normal" distribution or not?

    Hello guys, congratulations for the forum, it's really great. I am an italian student of medicine and I'm starting to learn statistics matter couz I...

    Started by Stratovarcticas‎, 03-10-2011 12:35 PM
    • Replies: 5
    • Views: 2,782
    03-10-2011, 04:29 PM Go to last post
  20. "Propagating" Degrees of Freedom

    Good evening! -Background I'm a chemistry student who's received some elementary training in statistics. At the moment, I need to take...

    Started by taharka‎, 04-29-2013 10:49 PM
    • Replies: 2
    • Views: 3,679
    04-29-2013, 11:20 PM Go to last post
  21. "significance metrics" for hypothesis testing

    ------------

    Started by p05‎, 08-02-2010 07:57 PM
    • Replies: 0
    • Views: 2,184
    08-02-2010, 07:57 PM Go to last post
  22. "Sticky" Cash Flows?

    Hey guys, I'm running a regression with cash flows in/out of a fund as my dependent variable and the S&P 500 and the VIX index as my independent...

    Started by sfspitfire23‎, 08-19-2011 04:03 PM
    • Replies: 0
    • Views: 2,736
    08-19-2011, 04:03 PM Go to last post
  23. "UNIANOVA" Command renders...? What do I call this table?

    UNIANOVA Depression BY Sex /METHOD=SSTYPE(3) /INTERCEPT=INCLUDE /EMMEANS=TABLES(OVERALL) /EMMEANS=TABLES(Sex) /PRINT=HOMOGENEITY ...

    Started by statn00b‎, 11-22-2011 02:28 PM
    • Replies: 0
    • Views: 1,779
    11-22-2011, 02:28 PM Go to last post
  24. "Use the normal approximation to the binomial distribution" help if possible?

    Hello, i'm new here and i'm stuck on a question. This isn't really from my homework, as i'm just reviewing for my final which is in a week. The...

    Started by uns33n‎, 01-07-2007 12:25 AM
    • Replies: 1
    • Views: 6,223
    01-07-2007, 01:10 AM Go to last post
  25. "Variance" by STDEV and Different Means

    Im trying to measure 'consistency' in baseball scores amongst two different sample groups. For example, in a sample of 162 games each, one team...

    Started by agutts6‎, 07-01-2012 01:56 PM
    • Replies: 5
    • Views: 2,571
    07-03-2012, 04:32 AM Go to last post
  26. "You never see a Ferrari rust like a Honda"

    When someone says "You never see a Ferrari rust like a Honda", the logical flaw is that a Honda is typically used as daily drivers thru severe...

    Started by CrunchAndSee‎, 12-03-2015 03:59 PM
    • Replies: 8
    • Views: 2,901
    12-31-2015, 03:00 PM Go to last post
  27. 'Alternate' proof that the expected value of the sample mean is the population mean

    It would be appreciated if someone could verify that this makes sense. By definition \bar{x} = \frac{\sum x_i}{n} So taking its expectation we...

    Started by sid9221‎, 04-06-2014 10:34 AM
    expected value, sampling
    • Replies: 3
    • Views: 3,351
    04-06-2014, 03:35 PM Go to last post
  28. (> one hour invested)

    I have spent more time than I should this one. Given that P(A or B) = 1/4, P(A) = 1/7, and P(A and B) = 1/9, find P(B). I've worked it many...

    Started by allan‎, 10-09-2012 04:14 AM
    • Replies: 1
    • Views: 1,447
    10-09-2012, 04:16 AM Go to last post
  29. (3x4) 2way anova

    Hi there. I have a problem with conducting the 3x4 anova test. I have two independent variables - data through 3 years divided into 4 seasons...

    Started by ivn‎, 04-04-2014 01:50 PM
    • Replies: 7
    • Views: 3,625
    04-05-2014, 06:28 AM Go to last post
  30. (Anova)Comparing 4 Data

    I have data of soil hardness from 4 different treatments I want to know if they are significantly different to each other or not. In Anova I can...

    Started by Mr Good News‎, 06-22-2015 08:43 PM
    • Replies: 1
    • Views: 1,034
    06-23-2015, 12:00 AM Go to last post
  31. (Binominal proportions) confidence interval – which formula to use?

    Hey, I got a quick question regarding confidence intervals. For a Rasch analysis I have to perform independent t-tests (it’s done to check for...

    Started by Tool7‎, 11-09-2012 04:59 AM
    confidence interval
    • Replies: 2
    • Views: 27,162
    11-12-2012, 06:30 AM Go to last post
  32. Lightbulb (bio)equivalence tests: acceptable difference

    As you may know, (bio)equivalence tests are tests that are able to show equivalence between two compared groups, other than the more common tests...

    Started by Afterburn‎, 04-26-2007 07:40 AM
    • Replies: 0
    • Views: 3,677
    04-26-2007, 07:40 AM Go to last post
  33. (categorical data - small sample) Appropriate test(s)?

    Greetings! I have a small sample (11 responses) of categorical data. I want to compare a binary response (near vs. far) to a nominal response...

    Started by JLC‎, 04-29-2013 10:29 PM
    categorical, chi squared help, fisher's exact test, small sample size
    • Replies: 0
    • Views: 1,931
    04-29-2013, 10:29 PM Go to last post
  34. (mis)-use of Post-Hoc tests. Theory question....

    Hi all, newbie here with a question I was hoping someone with more statistical theory knowledge could answer. :) I have a question for you re: the...

    Started by bob53‎, 05-05-2009 01:40 PM
    • Replies: 0
    • Views: 1,917
    05-05-2009, 01:40 PM Go to last post
  35. (Multiple regression) Calculating extra sum of squares without calculating H matrix?

    This is a problem given as practice for my exam Y: 3 4 6 8 5 5 9 8 7 5 X1: 1 -1 -1 1 0 0 0 0 0 0 X2: 0 0 0 1 -1 -1 1 0 0 0 X3: 0 0 0 0 0 0 0 1...

    Started by Patrick Yan‎, 11-20-2011 01:59 AM
    • Replies: 0
    • Views: 2,475
    11-20-2011, 01:59 AM Go to last post
  36. (nested) mixed model in SPSS

    Hi My question concerns both data structure (and subsequent the exact analysis model to use) and the implementation in the statistical software...

    Started by m.v‎, 04-17-2013 08:45 AM
    • Replies: 0
    • Views: 3,601
    04-17-2013, 08:45 AM Go to last post
  37. (Please help) Imputing multiple Likert-type items

    I have a set of Likert-type variables that I'm trying to sum up to form a scale. My dataset has around 5000 subjects, and there are about <10%...

    Started by sunny3333‎, 07-22-2014 09:43 PM
    • Replies: 0
    • Views: 1,348
    07-22-2014, 09:43 PM Go to last post
  38. (R) Analysing abundance in plots with different treatments -with factorial ANOVA?

    I'm not connected to a Uni anymore, but want to write an article on my friend's data from her Master's while applying for a Phd. The data will...

    Started by Wood4‎, 06-17-2016 03:22 AM
    factorial anova
    • Replies: 0
    • Views: 1,069
    06-17-2016, 03:22 AM Go to last post
  39. (Random Forests - R) Understanding randomForest’s classification error

    I am having trouble getting my head around the concept of classification error on the model confusion matrix. I understand that an 0.07 class.error...

    Started by Jackdaw‎, 06-02-2014 05:28 AM
    • Replies: 0
    • Views: 1,966
    06-02-2014, 05:28 AM Go to last post
  40. (SEM) Structural Modeling: identifying problems

    Hello, I've received a homework at my UNI to resolve untill my exam (which is friday). It's about SEM. It is in form of a forum post and we need to...

    Started by agata90‎, 02-02-2015 02:12 PM
    • Replies: 2
    • Views: 1,864
    02-02-2015, 04:43 PM Go to last post
  41. (SPSS logistic regression) Variable effect in wrong direction

    I am running a logistic regression with 7 IVs, N= 214. The model is significant and the R2 is .45. However, the individual variables show some odd...

    Started by bakere‎, 12-17-2012 10:05 AM
    • Replies: 2
    • Views: 2,274
    12-17-2012, 12:19 PM Go to last post
  42. Unhappy (too) small sample size?

    Without going into too much detail: I have a number of people every year. At one point, something happens that makes the yearly number of people...

    Started by tessa001‎, 09-12-2016 01:11 PM
    help me, online course, statistics
    • Replies: 1
    • Views: 1,399
    09-13-2016, 02:22 AM Go to last post
  43. (Urgent) Missing Data- Missed completely one item through out the study

    Hello Everyone, I ve been encounter one serious issue of missing data for my research. That is, i forgot to include one item in my research....

    Started by iopkl88‎, 04-11-2012 10:16 AM
    • Replies: 1
    • Views: 1,707
    04-11-2012, 10:22 AM Go to last post
  44. (weighted) mean of standard deviations

    Dear all, I have the following problem. Suppose I have three results of temperature measurements: 10 +/- 2 2 +/- 6 9 +/- 3 Here the +/-...

    Started by Kolin‎, 11-22-2011 07:24 AM
    • Replies: 2
    • Views: 4,337
    11-22-2011, 03:13 PM Go to last post
  45. Wink ***Fun Challenge -- weighted average of global rankings***

    Goal The goal is to create a weighted average of global rankings. Does not have to be perfectly accurate (if that was even possible). Specific...

    Started by rm2dance‎, 07-21-2011 11:26 PM
    • Replies: 2
    • Views: 3,041
    08-03-2011, 11:36 AM Go to last post
  46. *HELP PLEASE! I'm going CRAZY trying to figure this out.

    The UN is going to build a small clinic in a remote village in Africa to deal with the recent outbreak of a disease. The probability of having the...

    Started by statsistoohard‎, 02-23-2009 12:36 AM
    • Replies: 3
    • Views: 2,391
    02-23-2009, 01:16 AM Go to last post
  47. *Novice* Which test? Is one even possilble

    Hi Everyone, I am a complete novice to the world of statistics and I'm not the best mathematician. I have the data of three different city...

    Started by rowhi‎, 04-04-2014 09:44 AM
    • Replies: 2
    • Views: 1,903
    04-04-2014, 12:38 PM Go to last post
  48. -->(BOX-COX) Transformation breaks down for large (positive) coefficient values <--

    Hi, I have done a box-cox transformation of my response variable, using the following formula: (Y^lambda - 1)/lambda Previously, I have got some...

    Started by hanke83‎, 06-07-2013 04:05 AM
    box-cox, sas proc_transreg, transformation
    • Replies: 0
    • Views: 1,488
    06-07-2013, 04:05 AM Go to last post
  49. -.00 or .00

    Hi, I'm including a correlation table in a write-up and I'm sticking with two significant digits. One of my correlation coefficients is -.003. ...

    Started by dodeca‎, 08-18-2008 03:24 PM
    • Replies: 3
    • Views: 2,914
    08-19-2008, 11:45 AM Go to last post
  50. ....another beginner

    Hello everyone, :wave: I'm a beginner with stats but also a beginner with forums, so not even sure if I have posted this in the correct place - it...

    Started by enid‎, 11-24-2011 11:59 AM
    • Replies: 3
    • Views: 1,973
    11-26-2011, 08:14 AM Go to last post
  51. ..what should be a simple stats question

    that is kicking my proverbial rear for a CJ stats class.. assume a mean score of 20 offenses a month and a population standard dev of 4 offenses,...

    Started by Ryan‎, 02-18-2010 07:57 AM
    • Replies: 1
    • Views: 3,029
    02-22-2010, 01:35 PM Go to last post
  52. Unhappy .05 level of significance?!!!

    can someone please help me out? i just need the formula. i have no idea how to even start this problem! =( once i can figure out values for X then i...

    Started by michelecm‎, 07-06-2006 02:12 PM
    • Replies: 0
    • Views: 7,452
    07-06-2006, 02:12 PM Go to last post
  53. 0.00000 significance value

    Hi everyone, New to Talk Stats, so be nice! I have looked for an answer to my problem on previous posts but have not been able to find anything...

    Started by marson93‎, 04-10-2015 10:30 AM
    kruskal-wallis, mann-whitney u, significance testing, spss, stats help
    • Replies: 4
    • Views: 1,763
    04-11-2015, 07:56 AM Go to last post
  54. 0.025 quantile from standard normal dist. is

    1.96. Can anyone tell me how we get this number? This is related to Wald test. I don't know how I can calculate 0.025 upper quantile from...

    Started by hanelliot‎, 02-22-2010 11:21 PM
    • Replies: 1
    • Views: 5,968
    02-23-2010, 02:21 AM Go to last post
  55. Exclamation 0.05 Level of Significance... HW HELP!

    Here is the problem: (A) Select a random sample of 30 student from our population (we have a data entry to get the sample from). At the 0.05 level...

    Started by ik066287‎, 12-16-2007 03:52 PM
    • Replies: 0
    • Views: 5,770
    12-16-2007, 03:52 PM Go to last post
  56. 0.05 or 0.01 level of p for multiple comparisons?

    I wrote a scientific paper measuring ovarian volumes after two different surgical procedures performed on either ovary. The measurements were at...

    Started by ludomuzii‎, 06-28-2015 06:10 AM
    0.01, 0.05, level of significance
    • Replies: 3
    • Views: 2,089
    07-06-2015, 03:45 PM Go to last post
  57. Post 1 factor (2 levels), and 3 between-subjects factors

    Hi all, I am doing a psycholinguistics project (and bad at statistics) and would appreciate advice on what stats to run. There is one...

    Started by yinsstats‎, 09-24-2014 12:26 PM
    • Replies: 2
    • Views: 1,853
    09-30-2014, 05:46 AM Go to last post
  58. 1 level of nominal IV correlate to Interval DV - how to do this?

    I have 1 categorical Iv which has 4levels - and 1 dv which is interval scores The 4 levels of the Iv are 4likert scale responses - from "not at...

    Started by Kitty1471‎, 06-03-2014 09:26 PM
    correlation, interval data, nominal data
    • Replies: 0
    • Views: 1,062
    06-03-2014, 09:26 PM Go to last post
  59. Question 1 sample K-S-Test output

    Hi there, I got told that I would need to do a test to look at my data and whether it is normally distributed or not. So I did the 1 sample K-S-...

    Started by fraenzchen1‎, 01-11-2010 09:54 AM
    • Replies: 3
    • Views: 6,633
    01-12-2010, 06:08 AM Go to last post
  60. 1 tailed test or two tailed?

    A researcher would like to know if oxygen deprivation at the time of birth has a negative effect on IQ. My Answer: 1-tailed, right? I just...

    Started by i need a brain‎, 06-04-2008 06:00 PM
    • Replies: 1
    • Views: 4,980
    06-06-2008, 01:41 PM Go to last post

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