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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: 196,608
    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: 66,642
    09-30-2005, 09:44 AM Go to last post
  1. Significance and multiple outcomes - are we guilty of a form of subgroup analysis?

    In a piece of previous research we wanted to see if there was evidence that peoples' ability to perform CPR declined with time. To test this we made...

    Started by DrDogg‎, 10-03-2012 09:13 AM
    • Replies: 10
    • Views: 2,571
    10-04-2012, 12:24 PM Go to last post
  2. Using Cox multivariant regression!

    Hi I am trying to do Cox multivariate regression analysis in a project where I am trying to identify predictors of a particular disease using...

    Started by Fawzy‎, 10-04-2012 11:10 AM
    cox regression
    • Replies: 0
    • Views: 1,901
    10-04-2012, 11:10 AM Go to last post
  3. Two Questions

    First, I am trying to test two samples that have an extreme right skew against each other to figure out if there is a difference between the means. I...

    Started by PiggyPowell_90‎, 10-04-2012 10:46 AM
    • Replies: 1
    • Views: 1,110
    10-04-2012, 10:56 AM Go to last post
  4. Thought this was a simple linear regression, but now confused ...

    Hi: For practice (and of some use) I did a simple linear regression as follows (using one test subject for 90 days): the predictor was milligrams of...

    Started by statbill‎, 10-04-2012 09:53 AM
    • Replies: 0
    • Views: 1,210
    10-04-2012, 09:53 AM Go to last post
  5. Question Testing for correlation between a continuous variable and a categorical outcome

    Hi, I was wondering if anyone could help. I am trying to test for correlation between a continuous variable (patients' symptom interval, measured...

    Started by estev89‎, 10-04-2012 06:48 AM
    • Replies: 4
    • Views: 2,525
    10-04-2012, 09:01 AM Go to last post
  6. Testing for two means

    I am doing practice questions for hypothesis testing, for two means, n is large. I know the test stat for two means. H0: Mu1 - Mu2 = 0, Ha: Mu1...

    Started by kstone‎, 10-04-2012 01:35 AM
    clt, hyposthesis, two means
    • Replies: 5
    • Views: 1,578
    10-04-2012, 04:06 AM Go to last post
  7. How would ANOVA F-test change when you are testing equal means for subset of group?

    Suppose I had an independent random variable with Y_ij distributed N(miu_i, sigma) where miu_i and sigma are unknown. Now, 1<= i <= 5 and 1<= j <=...

    Started by gameomega‎, 10-04-2012 01:42 AM
    • Replies: 1
    • Views: 1,451
    10-04-2012, 01:46 AM Go to last post
  8. Trying to display 3+ scaled variables in one table

    Hello, I've been trying to display 3 variables that use the same scale with the same value labels in one table in SPSS V19 and have been...

    Started by hameed‎, 10-02-2012 06:14 PM
    frequency, scales, tables, variables
    • Replies: 1
    • Views: 1,227
    10-03-2012, 08:40 PM Go to last post
  9. Stat & probability word problems

    I need help on 3 homework problems @ least get an idea as to how to go about solving them. Question 1: Tom works the night shift at a gas station...

    Started by ILUVVB14‎, 10-03-2012 05:54 PM
    chips, coins, doughnuts, probability, word problems
    • Replies: 2
    • Views: 3,698
    10-03-2012, 07:28 PM Go to last post
  10. Cross Validation/Bootstrap on Time Series Segement

    I have a small time series segment (~100 to ~500 points) and would like to fit a function to it. I'm not interested in the out of sample performance,...

    Started by CSharpDummy‎, 10-03-2012 11:52 AM
    bootstrap, cross validation, time series
    • Replies: 3
    • Views: 1,759
    10-03-2012, 01:59 PM Go to last post
  11. bottling plant problem

    Problem. A company has given a contract to a bottling plant to fill its products with the product. The company has specified to the bottling plant...

    Started by seismo‎, 10-03-2012 01:15 AM
    • Replies: 1
    • Views: 1,309
    10-03-2012, 01:19 AM Go to last post
  12. Calculating correlation between dichotomous data and interval data?

    Hi, I'm hoping that someone might be able to point me in the right direction with this... I'm a respiratory physiotherapist working on my...

    Started by S.Whitaker‎, 10-02-2012 03:48 PM
    • Replies: 1
    • Views: 1,631
    10-02-2012, 04:02 PM Go to last post
  13. Question discrete choice model in r with mlogit with nested data

    My data has multiple observations within participants. Each participant has 10 trials. For each trial, there are 4 options, there are variables...

    Started by sophiadw‎, 10-01-2012 02:40 PM
    discrete choice model, mlogit, random utility model
    • Replies: 1
    • Views: 1,309
    10-02-2012, 03:59 PM Go to last post
  14. How can a PDF produce values larger than 1?

    I'm looking for an intuitive explanation on how a PDF can produce values larger than 1. To my understanding, a probability density function is the...

    Started by micdhack‎, 10-02-2012 07:55 AM
    • Replies: 3
    • Views: 1,454
    10-02-2012, 01:14 PM Go to last post
  15. From significance to insignificance. How come?

    Hi Guys, I am doing a research and i am struggling with one problem. Iam performing a logit regression. I have several variables, but one...

    Started by Statahulk‎, 10-02-2012 05:04 AM
    • Replies: 0
    • Views: 915
    10-02-2012, 05:04 AM Go to last post
  16. Random vs. fixed effects: explain it to grandma rinker

    Let's start by role playing; I'm your grandma and I know nothing or very little about stats. I've been hearing about fixed and random effects (not...

    Started by trinker‎, 10-01-2012 09:23 PM
    effects
    • Replies: 1
    • Views: 1,889
    10-01-2012, 11:29 PM Go to last post
  17. finding a tutor for SPSS?

    Sorry if this is in the wrong section, I'd like to find an online tutor who can help me with producing SPSS outputs for a few lab reports that I'm...

    Started by nick2104‎, 10-01-2012 02:04 AM
    • Replies: 2
    • Views: 1,440
    10-01-2012, 06:34 PM Go to last post
  18. Multiple Regression Model To Predict Comments Based on Referrers

    I want to predict the comments on a blog post based on the referrers the blog post received. I've already gathered up the data, put it into R, and...

    Started by tukeytoad‎, 10-01-2012 06:24 PM
    • Replies: 0
    • Views: 1,054
    10-01-2012, 06:24 PM Go to last post
  19. intro stats: statistical assumptions?

    hello! hoping someone can help me. our class did a small sampling project. we had to count how may people wear hats to class on monday's vs...

    Started by carbonfibre‎, 10-01-2012 08:36 AM
    • Replies: 2
    • Views: 2,108
    10-01-2012, 03:23 PM Go to last post
  20. Appropriate to use time as covariable in ANCOVA?

    Hello stats people, I need to assess whether the rate of increase (in soil carbon) differs significantly between two groups (forests). I believe...

    Started by aibing‎, 09-26-2012 10:33 PM
    ancova
    • Replies: 11
    • Views: 2,888
    09-30-2012, 10:50 PM Go to last post
  21. central limit theorem and mean

    Hi, I know that the central limit theorem states that as sample size increases the sampling distribution of the sample mean tends toward normal....

    Started by samiam99‎, 09-29-2012 06:47 PM
    • Replies: 8
    • Views: 1,998
    09-30-2012, 04:28 PM Go to last post
  22. How best to account for seasonality when analysing bird monitoring data

    Hello All, I have some monitoring data from seabird surveys carried out in an offshore construction site. Surveys were undertaken before, during...

    Started by Ally30‎, 09-26-2012 01:18 PM
    glm, glmm, interpreting results, monitoring data
    • Replies: 1
    • Views: 1,585
    09-30-2012, 01:43 AM Go to last post
  23. Please help

    Research data indicates that adolescents, especially adolescent girls, experience a drop in self-esteem. To evaluate this result, a researcher...

    Started by jreese311‎, 09-29-2012 09:31 PM
    • Replies: 0
    • Views: 1,657
    09-29-2012, 09:31 PM Go to last post
  24. Some Help Please

    I keep getting the answer of 2.59 when I calculate the problem(For Part B). It is suppose to be 1.6. I am wondering what am I doing wrong? Thanks.

    Started by PSG‎, 09-29-2012 06:20 PM
    • Replies: 2
    • Views: 2,350
    09-29-2012, 07:24 PM Go to last post
  25. 2 sided exact significance in fisher's exact test

    i compared the frequency of cardioembolism between age-group <45years and 46-50 years using SPSS using cross-tab. As you can see the result in the...

    Started by hikehub‎, 09-29-2012 12:57 AM
    • Replies: 1
    • Views: 21,560
    09-29-2012, 06:09 AM Go to last post
  26. Help on Ratio

    Can anyone help me? For example, I have a store, 4 people bought iPhones and each buyer bought accessories too. Buyer#1: 1 iPhone, 4...

    Started by leidi‎, 09-28-2012 06:41 PM
    average, elementary, ratio, regression, statistic
    • Replies: 2
    • Views: 2,304
    09-28-2012, 08:37 PM Go to last post
  27. Help choosing tests

    Hi All, I am needing some advice with regards to choosing an approriate test for some data that I will be researching. Basically participants...

    Started by kat0989‎, 09-28-2012 12:08 AM
    • Replies: 2
    • Views: 1,516
    09-28-2012, 08:58 AM Go to last post
  28. Regarding supremum

    Hi guys, I hope everyone's been doing well. I have a quick question. Figured someone could answer without much effort. I know that with...

    Started by Link‎, 09-27-2012 10:48 PM
    • Replies: 9
    • Views: 1,875
    09-28-2012, 12:45 AM Go to last post
  29. Linear regression & correlation for time series data

    Hi all, I've searched wide and can only find warnings about NOT applying common linear regression and correlation statistics to time series data,...

    Started by aibing‎, 09-27-2012 10:41 AM
    correlation, linear regression, time series
    • Replies: 2
    • Views: 1,698
    09-27-2012, 10:52 PM Go to last post
  30. how to solve this problem ?

    A new procedure is carried out in order to reduce the radiation exposure to the technologists during the examination for the patients. The radiation...

    Started by nobel1154‎, 09-27-2012 04:39 PM
    • Replies: 1
    • Views: 1,052
    09-27-2012, 04:50 PM Go to last post
  31. Is it allowed to take the standard deviation of percents?

    Hello, I've a data set of 1002 (I'm quite sure it is not a normal distribution). Foreach entry i've some Value in %. I've calculated the mean...

    Started by Marco101‎, 09-17-2012 03:57 AM
    percents, standard deviation
    • Replies: 2
    • Views: 2,862
    09-27-2012, 01:41 PM Go to last post
  32. Favorite beginner textbook?

    Sorry if this is repeat info; I am a newbie to the Forum. I did a quick search and did not see a similar question, so here goes: I am teaching a...

    Started by slccmh‎, 09-19-2012 09:18 AM
    • Replies: 8
    • Views: 1,726
    09-27-2012, 12:54 PM Go to last post
  33. General Question: What is the meaning of an + or - sign as exponent?

    I don't know whether this is the right place for the thread. Nevertheless I am interested in the meaning of a plus or minus sign in the exponent. Can...

    Started by el_rondinho‎, 09-27-2012 04:04 AM
    • Replies: 5
    • Views: 1,508
    09-27-2012, 07:53 AM Go to last post
  34. Interpreting Confidence Intervals

    Hey everyone. I am trying to answer a question on my homework. If the confidence intervals are both negative (i.e. the lower and upper bound) then do...

    Started by JoeHall‎, 09-26-2012 07:46 AM
    • Replies: 7
    • Views: 3,793
    09-26-2012, 08:29 PM Go to last post
  35. Mean of means, Error Bars and Pooled Variance

    Hello, I am conducting an experiment and I am having a problem with the statistics. The most important analysis is basic stuff and it's done but...

    Started by srd‎, 09-17-2012 08:55 AM
    • Replies: 1
    • Views: 1,810
    09-26-2012, 10:29 AM Go to last post
  36. Can't figure out what test to use.

    Hello, I have tried all kinds of test in spss in order to find out if there are any significant difference in compliance between different citys....

    Started by drgunnar‎, 09-25-2012 08:53 AM
    logit
    • Replies: 6
    • Views: 1,842
    09-26-2012, 09:22 AM Go to last post
  37. Probability of Sample Mean

    I am stuck at this question for a test, According to a survey it takes 0.7 seconds to download the home page of a website. Suppose that the...

    Started by couleur‎, 09-20-2012 08:16 AM
    • Replies: 3
    • Views: 4,788
    09-26-2012, 07:45 AM Go to last post
  38. Some Help

    Please. I keep calculating this on my TI84 and the calculator keeps reading error. Just wondering what I might be doing wrong?

    Started by PSG‎, 09-25-2012 09:57 PM
    • Replies: 7
    • Views: 2,279
    09-25-2012, 11:25 PM Go to last post
  39. Difference of 2 Chi-Square Variables Still a Chi-Square Variable?

    I did a problem for homework that made me show that the sum of two chi-square variables is still a chi-square variable. However, when I find the...

    Started by floatandsuch69‎, 09-04-2012 10:26 AM
    chi-square
    • Replies: 2
    • Views: 1,885
    09-25-2012, 09:52 PM Go to last post
  40. equal variance fails

    Hello, Well, I can assure you, I have read up on this particular issue. In principle, I should be doing a 3-way RM anova but sigma stat does not...

    Started by jewels‎, 09-25-2012 09:48 PM
    • Replies: 0
    • Views: 1,487
    09-25-2012, 09:48 PM Go to last post
  41. [Relation of daily sales] Chi-Square, T-Test or Correlation?

    Hello, Which to use to test whether Monday sales and sales on the other days of the week are independent from each other. Case: A promotion...

    Started by kggunes‎, 09-13-2012 05:22 AM
    dependent
    • Replies: 8
    • Views: 1,463
    09-25-2012, 08:26 PM Go to last post
  42. Log normal distribution.

    Hello all, I was going through the posts on this forum to solve at least one of the queries and it seems like I am an amateur at stats so this...

    Started by simnasameer‎, 09-25-2012 04:56 AM
    • Replies: 3
    • Views: 1,536
    09-25-2012, 11:02 AM Go to last post
  43. significant variables

    I am working on a problem and need to determine the stat. significant variables and provide an interpretation on sex? I got the following results...

    Started by Snowy88‎, 09-24-2012 11:24 AM
    significant
    • Replies: 10
    • Views: 2,223
    09-25-2012, 08:04 AM Go to last post
  44. What test to use, please help?

    Hello, I would very much like to find out what test to use for the following data. I have percentage of compliance (how many people who...

    Started by drgunnar‎, 09-24-2012 08:58 AM
    • Replies: 2
    • Views: 1,184
    09-25-2012, 02:14 AM Go to last post
  45. confidence levels and t tests

    A florist wants to know if the orchids have a greater impact on the design asthetics of a room, when they are potted in a large pot rather than a...

    Started by mikeh‎, 09-24-2012 02:38 PM
    • Replies: 5
    • Views: 2,106
    09-24-2012, 08:02 PM Go to last post
  46. Correlation Question w 3 variables

    Can someone please tell me how it is possible for X to be correlated with Y and Z to be correlated with Y, but X and Z be uncorrelated? I'm having...

    Started by yakonomica‎, 09-23-2012 10:38 AM
    • Replies: 7
    • Views: 2,280
    09-24-2012, 06:10 PM Go to last post
  47. Overlapping Standard Deviations

    Hi, I have some data from an experiment that has one factor (temperatures) and five levels. When I plot the data with the standard deviations...

    Started by BlocPart‎, 09-24-2012 03:01 PM
    • Replies: 3
    • Views: 5,872
    09-24-2012, 04:34 PM Go to last post
  48. Poisson Random Distribution

    Hello, I haven't had any statistics in over 10 years, and gotta say that I'm having a hard time getting into it. I'm currently working on an...

    Started by cppdude‎, 09-24-2012 01:39 PM
    • Replies: 1
    • Views: 943
    09-24-2012, 03:47 PM Go to last post
  49. independent or paried t test?

    the Census bureue believe that recently the ethnic composotion of a certain city has changed. 5 years ago there were 40% Asian, 22% Caucasian, 8% AA,...

    Started by nyo‎, 09-24-2012 11:16 AM
    • Replies: 8
    • Views: 2,239
    09-24-2012, 01:05 PM Go to last post
  50. Fisher's Exact Test for determining correlation between variables

    Hello all, My P.I. has presented me with a 2x2 contingency table and asked me to perform Fisher's Exact Test to determine whether a correlation...

    Started by Omega Glory‎, 09-02-2012 01:07 AM
    • Replies: 14
    • Views: 14,552
    09-24-2012, 11:52 AM Go to last post
  51. variability around a set of integers

    Hi. Say I have 100 observations for 10 variables. Each observation for each variable should ideally be coded as 1,2 or 3. However, it is possible...

    Started by mister_bluesman‎, 09-24-2012 03:56 AM
    • Replies: 1
    • Views: 1,734
    09-24-2012, 07:47 AM Go to last post
  52. At a loss! Unequal variance, unequal sample sizes and ordinal DV!

    I have been searching for hours for a solution to this problem but I can't find an answer. I am hoping someone can point me in the right direction. ...

    Started by marika‎, 09-22-2012 02:41 PM
    • Replies: 3
    • Views: 2,463
    09-23-2012, 01:21 PM Go to last post
  53. Minimum sample size for paired t-tests

    Hi All, I remember reading somewhere that the minimum sample size to conduct paired t-tests was ~30, as this will ensure that there is adequate...

    Started by bozatron‎, 09-18-2012 09:49 PM
    • Replies: 7
    • Views: 19,641
    09-23-2012, 12:48 AM Go to last post
  54. repeated mesures with negative correlation

    Hi all I'm a data analyst at the University of Sydney, Australia doing research into home advantage in soccer. I am using Poisson regression to...

    Started by chrisg‎, 09-22-2012 10:01 PM
    • Replies: 0
    • Views: 2,019
    09-22-2012, 10:01 PM Go to last post
  55. Summation Problem - new in the forum

    Hello everyone, I am new in the forum and I came here because I am desperate. I am taking stats 1101 in school not because I chose to, but because I...

    Started by gih‎, 09-22-2012 02:49 PM
    stats, sum, summation
    • Replies: 3
    • Views: 1,562
    09-22-2012, 03:36 PM Go to last post
  56. Quick IV/DV Question

    Hi everyone, Ive got a quick question on variable types. In my study, people watch a clip, then answer how they feel between 1 and 10. Then they...

    Started by mistermagoo‎, 09-22-2012 01:15 PM
    • Replies: 0
    • Views: 1,273
    09-22-2012, 01:15 PM Go to last post
  57. R question

    Any suggestions to find a formula relating R-square and the F-test for regression.

    Started by Snowy88‎, 09-21-2012 05:17 PM
    • Replies: 7
    • Views: 3,063
    09-22-2012, 09:21 AM Go to last post
  58. Error Propagation

    If I have two sets of measurements (x and y) each with 3 values x: 1,2,3 and y: 4,5,6 and I need to divide the two x/y to get z can I work out all...

    Started by wood2235‎, 09-21-2012 08:57 PM
    • Replies: 0
    • Views: 1,047
    09-21-2012, 08:57 PM Go to last post
  59. Post Hoc testing for ANCOVA

    Hi everyone. I am trying to figure out what post hoc tests are most appropriate for an ANCOVA with two IVs and two Covariates where one IV may act as...

    Started by Evermilyea‎, 09-21-2012 04:26 PM
    • Replies: 0
    • Views: 1,181
    09-21-2012, 04:26 PM Go to last post
  60. Likert scale data and regression

    First I know that in theory the independent variables don't assume any given distribution. But in fact that can't be true or you would use...

    Started by noetsi‎, 09-19-2012 09:05 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 5,380
    09-21-2012, 04:11 PM Go to last post

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