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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: 196,911
    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: 66,833
    09-30-2005, 09:44 AM Go to last post
  1. T test vs. Chi Sq

    Is an unpaired t-test the same as a chi sq test with respect to the resulting p-value if I'm using categorical data (0s and 1s)? Thanks.

    Started by crisisinmedicine‎, 08-20-2013 11:49 AM
    chisq, pvalue, significance, stats, ttest
    • Replies: 2
    • Views: 1,688
    08-20-2013, 01:58 PM Go to last post
  2. Best/Most Appropriate method of Analysis?

    Hello all, I have a project at work involving ranking and I'm not quite sure how best to proceed or which statistical test/analysis would be best...

    Started by lancearmstrong1313‎, 08-19-2013 06:09 AM
    • Replies: 5
    • Views: 1,676
    08-20-2013, 10:52 AM Go to last post
  3. Lightbulb One-way ANOVA or two-way ANOVA?

    Supposed we gave 100 males and 100 females protein supplement for 3 months. We measured the muscle thickness of the participants before and after the...

    Started by vivian88‎, 08-18-2013 06:30 AM
    anova
    • Replies: 11
    • Views: 2,505
    08-20-2013, 08:11 AM Go to last post
  4. can we use ANCOVA in quasi experimental designs?

    hi i want to know how check impact of IV on DV. both distributions are extremely non normal and my question is 1. can i trust ANCOVA results to...

    Started by gksiddiqui‎, 08-19-2013 04:15 PM
    • Replies: 4
    • Views: 3,465
    08-20-2013, 01:28 AM Go to last post
  5. Choosing best model in regression - Backwards Stepwise + hierarchical modeling?

    Hello - my goal is to fit a model using backwards stepwise regression and hierarchical modeling, testing the association between a primary predictor...

    Started by AAA7‎, 08-19-2013 03:19 PM
    best model, hierarchical model
    • Replies: 1
    • Views: 2,209
    08-19-2013, 03:43 PM Go to last post
  6. Comaring Logit of full dataset to logit on subset of the dataset

    I'm trying to argue that my logit model does a better job of predicting probabilities for a subset of my data than it does for my full dataset. The...

    Started by mkobren‎, 08-15-2013 08:25 AM
    • Replies: 2
    • Views: 1,438
    08-19-2013, 02:36 PM Go to last post
  7. regression to the mean?

    Hi, I have a Q regarding regression to the mean. I am doing a within subject design. I am having subjects rate photos of individuals for...

    Started by jasonKDG‎, 08-17-2013 12:34 PM
    • Replies: 3
    • Views: 1,321
    08-19-2013, 11:58 AM Go to last post
  8. Basic question regarding Logistic regression using census data

    Instead of using sampled data, if I use census data to perform Logistic regression, what is the meaning of z-value? Are all coefficients valid...

    Started by yamamoto‎, 08-19-2013 09:35 AM
    • Replies: 1
    • Views: 1,358
    08-19-2013, 09:48 AM Go to last post
  9. University Level Homework Challenege. PLEASE Help!

    If anyone can answer any questions it would be a HUGE help and I couldn't thank you enough. Its impossible homework and I don't understand a word!...

    Started by MCox93‎, 08-19-2013 09:39 AM
    • Replies: 1
    • Views: 1,330
    08-19-2013, 09:47 AM Go to last post
  10. Question on CHI squared that I don't understand the solution

    A experimenter is convinced that her measuring instrument had a variability measured by standard deviation Alpha = 2. During an Experiment she...

    Started by marmar‎, 08-18-2013 05:51 PM
    • Replies: 0
    • Views: 2,987
    08-18-2013, 05:51 PM Go to last post
  11. Statistics Homework Help

    1.) Calculate SS, variance, and standard deviation for the following population of N 7 scores: 8, 1, 4, 3, 5, 3, 4. 2.) A population has a mean...

    Started by tianicole‎, 08-18-2013 04:54 PM
    • Replies: 2
    • Views: 8,639
    08-18-2013, 05:09 PM Go to last post
  12. Conflicting ANOVA & T Test Results. How do I interpret this?

    Hey all, I was hoping you could help me with something. I have three data groups, A, B, & C, and I'm testing for a specific effect. I ran a...

    Started by QueenOfStats‎, 04-14-2013 10:46 AM
    • Replies: 6
    • Views: 3,046
    08-18-2013, 04:23 PM Go to last post
  13. state reason for using one tail in the analysis of variance test ?

    I think in this way that since in anova we partition the total variability into various independent components , and since the Mean square of this...

    Started by Cynderella‎, 08-17-2013 12:58 AM
    anova, experiment design, one-tail test
    • Replies: 6
    • Views: 2,177
    08-18-2013, 07:20 AM Go to last post
  14. 3 Arm Study: Categorical Data needs a P-Value!

    Hi, I conducted a 3 arm study and now I am trying to find signficance/lack of signififance. Some data I gathered, such as age was easy to...

    Started by crisisinmedicine‎, 08-17-2013 12:11 PM
    error, pvalue, significance, stats, test
    • Replies: 3
    • Views: 1,475
    08-17-2013, 03:11 PM Go to last post
  15. Which is the minimum number of replicates that I can use

    Hi all, I need to design an experiment but I have a tight budget. Our statistician recommend to have at least 20 df for the error, which most of...

    Started by freedom21‎, 08-15-2013 05:17 AM
    • Replies: 6
    • Views: 3,302
    08-17-2013, 10:17 AM Go to last post
  16. Latent variable interaction

    I am trying to fit a model with latent variables interaction. The model is: η3 = β1 η1 + β2 η2 + β3 η1 × η2 + ζ3 in which η2 may be considered...

    Started by Holmes‎, 08-17-2013 06:24 AM
    • Replies: 0
    • Views: 1,486
    08-17-2013, 06:24 AM Go to last post
  17. How to account for short-term trends in time-series data?

    Hi guys, I would like to find out which of my 10 independent variables (IVs) best accounts for the changes of my dependent variable (DV) at...

    Started by InneSim‎, 08-16-2013 06:44 AM
    regression analysis, time-series, trend analysis
    • Replies: 1
    • Views: 1,362
    08-17-2013, 04:57 AM Go to last post
  18. What is model adequacy checking in anova?

    In anova, we assume that the random error term \epsilon_{ij} is independent and identically distributed with mean 0 and variance \sigma^2 How can...

    Started by Cynderella‎, 08-16-2013 08:03 PM
    anova, assumptions, experiment design, model checking
    • Replies: 0
    • Views: 3,695
    08-16-2013, 08:03 PM Go to last post
  19. Lightbulb Conditional expectation of maximum given minimum of order statistics

    Let we have $X_1 ... X_n$ - iid random variables with $F(x)$ - distribution function. So we have $X1:n$ and $Xn:n$ - minimum and maximum. Help me...

    Started by Sergey‎, 08-16-2013 06:50 AM
    conditional expectation, order statistics, probability, statistics
    • Replies: 1
    • Views: 3,140
    08-16-2013, 09:18 AM Go to last post
  20. Interpreting sensitivity and specificity with corresponding PPV and NPV

    Hello, I have calculated sensitivities, specificities with pos and neg predictive values for different cutoff values of two biomarkers. What i...

    Started by amb_e‎, 08-15-2013 09:26 AM
    negative, positive, predictive value, sensitivity, specificity
    • Replies: 9
    • Views: 3,528
    08-15-2013, 02:43 PM Go to last post
  21. 3 columns of categorical data - what test to use for significance?

    Hi I did surveys on pre-teens, teens, 20s (3 "columns") and need to find signfifiance (p-value). What test do I use? I keep trying Chi square on...

    Started by crisisinmedicine‎, 08-15-2013 10:27 AM
    chisquare, pvalue, significance, statistics, stats
    • Replies: 4
    • Views: 2,503
    08-15-2013, 12:33 PM Go to last post
  22. Sobel mediation test with a categorical IV (3 variables) - help appreciated

    Hello, Sorry this is probably a simple question - I know how to do a sobel test with a categorical IV with 2 categories but am unsure if there...

    Started by benjwalt‎, 08-15-2013 08:34 AM
    • Replies: 0
    • Views: 1,844
    08-15-2013, 08:34 AM Go to last post
  23. Accounting for confidence intervals in determining a mean

    I have received some elemental analysis of a metal which I want to use to determine the effects of radiation. I want to report my results for the...

    Started by TheStudent‎, 08-15-2013 07:28 AM
    combining uncertainty, confidence intervals, t distribution
    • Replies: 0
    • Views: 2,236
    08-15-2013, 07:28 AM Go to last post
  24. Question Comparing groups - Normalization to control

    Hello everyone! This is my first time around. I know a few things about classical hypothesis testing, p values and CIs, but beyond that, my...

    Started by mterr‎, 08-15-2013 02:48 AM
    • Replies: 0
    • Views: 5,158
    08-15-2013, 02:48 AM Go to last post
  25. Linear Mixed Model vs Nested Design for Behavioral Data

    I am relatively new to statistics and was wondering if someone could help me determine which test to use to analyze my data. I am testing behavioral...

    Started by Aves52‎, 08-14-2013 04:16 PM
    • Replies: 0
    • Views: 1,744
    08-14-2013, 04:16 PM Go to last post
  26. What is the pdf of the standard deviations of a set of gaussian distributions?

    Hi all, I'm analysing some data from an oceanographic experiment and looking for some statistical widsom. We have a set of profiles of the...

    Started by neillmackay‎, 08-14-2013 06:44 AM
    • Replies: 0
    • Views: 1,987
    08-14-2013, 06:44 AM Go to last post
  27. MNL model using Nlogit: Flat log-likelihood

    Hi there I have collected data from a Choice Modeling survey, and I am having a few problems assessing the outputs when using an MNL model through...

    Started by jimmy_p‎, 08-14-2013 06:10 AM
    flat log-likelihood, mnl model, nlogit
    • Replies: 0
    • Views: 1,499
    08-14-2013, 06:10 AM Go to last post
  28. Help reporting stats with a graph

    Hey everyone I'm a university student and I'm looking to report some statistics about a medical intervention for a review that I'm doing. The...

    Started by samwalker121‎, 08-14-2013 04:40 AM
    • Replies: 0
    • Views: 1,116
    08-14-2013, 04:40 AM Go to last post
  29. Bayes CFA

    Hi Folks, I have several questions about Bayes CFA in Open bugs that I hope you might be able to help me out with. First the setup: Here is a...

    Started by Lazar‎, 08-13-2013 09:36 PM
    bayes, cfa, lavaan, openbugs
    • Replies: 5
    • Views: 4,309
    08-14-2013, 12:19 AM Go to last post
  30. Correlation analyses in Excel/SPSS

    Hi there, Could someone help me with conducting some correlation analyses in Excel/SPSS? I already set up an Excel document in which I made some...

    Started by Simone‎, 08-13-2013 05:33 PM
    • Replies: 0
    • Views: 1,577
    08-13-2013, 05:33 PM Go to last post
  31. overdispersion of binary data

    Hi, I have binary data that I am testing for the significance of nesting effects. How do I determine if (or whether) the data is overdispersed?...

    Started by michroze‎, 08-12-2013 11:37 AM
    • Replies: 7
    • Views: 4,658
    08-13-2013, 03:33 PM Go to last post
  32. Which test to use?

    Hi, 1. I need to know how to compare CATEGORICAL DATA. I have 4 types of anesthesia applied to 3 different groups (a, b, c). What test do I use to...

    Started by crisisinmedicine‎, 08-13-2013 11:01 AM
    exce, l anova, stats, t question, ttes
    • Replies: 2
    • Views: 1,896
    08-13-2013, 11:33 AM Go to last post
  33. Which statistical test when comparing two groups to see which is closer to control?

    To elaborate, I have 3 groups for a study. They each have log ratios for the same set of 5522 sample data. Group A Group B ...

    Started by hg617‎, 08-13-2013 10:27 AM
    • Replies: 1
    • Views: 2,093
    08-13-2013, 10:42 AM Go to last post
  34. Can I use Chi-Squared Likelihood Ratio?

    Hello Everyone! This forum looks great and thank you to any kind people willing to help me out. Probably a simple question, but I cannot find...

    Started by james484‎, 08-13-2013 09:37 AM
    • Replies: 1
    • Views: 2,678
    08-13-2013, 10:04 AM Go to last post
  35. Detecting outliers in preparation for CFA and SEM

    I plan to do CFA and SEM involving about 6 latent variables, each measured with 3 or more indicators (all measured with a 7-point Likert scale). ...

    Started by grreee12‎, 08-13-2013 09:16 AM
    • Replies: 0
    • Views: 2,360
    08-13-2013, 09:16 AM Go to last post
  36. Distribution of averages in non-parametric stats??

    Hi, I am new to the forum and learning the stats I need as I go:) I have done some parametric stats in undergrad but never dealt with...

    Started by mattma1970‎, 08-13-2013 01:05 AM
    non-parametric tests
    • Replies: 1
    • Views: 1,673
    08-13-2013, 07:31 AM Go to last post
  37. how to classify.mean score for.3 point likert scale?

    Hey everyone i am now in great need for help. I actually did a questionnaire with 3 points of likert scale which are not agree, not sure, and agree....

    Started by samm‎, 08-12-2013 10:02 AM
    • Replies: 2
    • Views: 2,217
    08-13-2013, 02:41 AM Go to last post
  38. Use of dummy in Plackett-Burmann screening

    I am trying to set up an experiment for optimizing medium composition for bacterial growth using the Plackett-Burman design. I am planning to do a...

    Started by Essen1‎, 10-23-2012 05:47 AM
    2-fractional factorial
    • Replies: 8
    • Views: 5,091
    08-13-2013, 12:55 AM Go to last post
  39. Comparing groups with different sample sizes. ANOVA?

    Hi guys, I am trying to figure out if there is a statitcal difference between the average number of infant deaths between low, med, and high income...

    Started by bullethead05‎, 08-12-2013 11:55 AM
    • Replies: 5
    • Views: 2,190
    08-12-2013, 07:18 PM Go to last post
  40. Margin of error for stratified survey sample

    Hi all, apologies for cross-posting: I posted this in another forum last week; it received over 100 views but no responses! I have a stratified...

    Started by speegster‎, 08-11-2013 06:51 PM
    margin of error, stratified sampling, survey data
    • Replies: 3
    • Views: 6,187
    08-12-2013, 07:11 PM Go to last post
  41. Sorry - another question on normality and ANOVAs - sources needed ....

    Hello everyone, I have been trying to find information everywhere and would be so grateful for any help. My situation: As part of my postdoc...

    Started by benjwalt‎, 08-12-2013 04:00 PM
    • Replies: 7
    • Views: 1,979
    08-12-2013, 06:30 PM Go to last post
  42. Compare four groups of (related???) data -- is a Friedman test ok?

    Hello, During my study of animal behavior, each of my 10 study subjects (all young females) received a number of aggressions from individuals...

    Started by shetland‎, 08-12-2013 06:04 PM
    group comparison
    • Replies: 0
    • Views: 1,569
    08-12-2013, 06:04 PM Go to last post
  43. Which statistical test to use for significance (p-value)?

    Hi, I am trying to find significance in a study I conducted. There are 3 groups (so 3 columns on MS Excel) and I am testing significance between...

    Started by crisisinmedicine‎, 08-12-2013 12:25 PM
    analysis, pvalue, statistical, stats
    • Replies: 3
    • Views: 1,848
    08-12-2013, 04:03 PM Go to last post
  44. Smile Mean and variance of multiplication of several random variables

    Hi, Can anybody help me to know how I can calculate the mean and standards deviation of several random variables multiplication? Z=x1.x2...xn while...

    Started by rmasoumi‎, 08-12-2013 03:49 PM
    • Replies: 0
    • Views: 1,432
    08-12-2013, 03:49 PM Go to last post
  45. Group Size for Binary Logistic Regression

    I am trying to determine the odds ratio for the effect of C on A. However, my is a sample of n = 45 with 4 = yes and 41 = no. Is this small group...

    Started by michroze‎, 08-12-2013 10:41 AM
    binary dependent variable, logistic regression, sample size determination
    • Replies: 6
    • Views: 2,103
    08-12-2013, 02:44 PM Go to last post
  46. Question Statistical Analysis: Which measure of association for me?

    My research hypothesis claims that there is a relationship between my independent variable, student’s economic status and the dependent variable, SOL...

    Started by Vegas2012‎, 08-12-2013 01:46 PM
    statistical analysis
    • Replies: 1
    • Views: 1,492
    08-12-2013, 01:56 PM Go to last post
  47. Logistic Regression Problem

    Hi I was reviewing some old logistic regression material. I saw where one document referred to the logit as linear regression. Therefore, this...

    Started by Jrb599‎, 08-12-2013 09:41 AM
    • Replies: 6
    • Views: 1,680
    08-12-2013, 01:40 PM Go to last post
  48. Variance Components and Intraclass Correlation Coefficients for Binary Data

    Hi, I am performing a variance components analysis of a 3 level nested model of binary data. Given the lack of homoscedasticity at the individual...

    Started by michroze‎, 08-12-2013 12:59 PM
    binary data, variance components, variance estimation
    • Replies: 0
    • Views: 1,715
    08-12-2013, 12:59 PM Go to last post
  49. Exponential Distribution Question

    Can someone please help me with the attached question? I'm stuck on it for so long and it's driving me crazy, I think it's relatively easy but I...

    Started by kylonewton‎, 08-12-2013 12:36 PM
    • Replies: 2
    • Views: 2,517
    08-12-2013, 12:52 PM Go to last post
  50. How many pp do I need to know my correlation applies to the larger group?

    How many pp do I need to know my correlation applies to the larger group? I'm looking a people in a few prisons and what economic backgrounds they...

    Started by cms‎, 08-10-2013 12:15 PM
    • Replies: 4
    • Views: 3,055
    08-12-2013, 07:13 AM Go to last post
  51. Quartiles in a normal Distribution

    how would one find quartiles in a normal distrubtion? im just confused as to what im supposed to look for i know the mean/median/q2 in this case...

    Started by dee‎, 10-02-2005 10:07 PM
    • Replies: 5
    • Views: 124,397
    08-12-2013, 04:39 AM Go to last post
  52. Stochastic Model Validation

    Hi, I am working on a model that takes in a stochastic time series (turbulent velocity) as input and produces n time series outputs. Since the inputs...

    Started by thakchi‎, 08-12-2013 03:42 AM
    pdf, skewness, stochastic, time series, validationstudy
    • Replies: 0
    • Views: 2,641
    08-12-2013, 03:42 AM Go to last post
  53. Chi-square post-hoc tests - Adjusted residuals vs. 2x2 chi-squares.

    Hi, I'm running a few chi-square analyses that are greater than 2x2 tables and am interested in reporting exactly where the significant...

    Started by jongstl‎, 08-11-2013 05:13 PM
    • Replies: 1
    • Views: 5,620
    08-12-2013, 01:21 AM Go to last post
  54. Which formula can i use?

    Hi I am not good at Statistics. Sorry in advance if my question is too much childish. Can someone please look at the attached file and let me...

    Started by rony675‎, 08-11-2013 11:17 PM
    • Replies: 0
    • Views: 1,465
    08-11-2013, 11:17 PM Go to last post
  55. P-Value/ Z statistic

    Hi! I've posted a question and have attempted some of them. If someone could please help me get started or provide an explanation to what to do to...

    Started by Theman‎, 08-11-2013 04:51 PM
    • Replies: 0
    • Views: 4,290
    08-11-2013, 04:51 PM Go to last post
  56. independent t tests

    If I have 2 independent groups and need to determine the significant difference in scores between the 2 groups where Ho(u2-u2)+0 no difference and...

    Started by Kellimac‎, 08-11-2013 01:12 PM
    • Replies: 3
    • Views: 1,585
    08-11-2013, 04:01 PM Go to last post
  57. Sample Size

    Hi, I hope this is not a silly question, I have been through the forum posts and a few text books, but I have got myself confused. The problem is...

    Started by Wet_Dog‎, 08-08-2013 11:12 AM
    • Replies: 3
    • Views: 2,047
    08-11-2013, 12:40 PM Go to last post
  58. Comparing means subgroups in SPSS

    Hello I would really appreciate some help with a problem I have in analysing my data. I am using SPSS 21 and would like to compare cell counts...

    Started by inov‎, 08-11-2013 06:03 AM
    • Replies: 0
    • Views: 3,689
    08-11-2013, 06:03 AM Go to last post
  59. Can anyone help me with these questions?

    this thread no longer exists

    Started by dowkahs‎, 08-10-2013 05:59 PM
    • Replies: 1
    • Views: 2,068
    08-10-2013, 07:48 PM Go to last post
  60. Sampling from a Sub Sample and Normality Assumption

    Say I have sample data (let's call it XYZ) that is drawn from another survey (the US Current Population Survey). This entails that the universe of my...

    Started by StatsScared‎, 08-07-2013 11:47 AM
    sampling normality
    • Replies: 10
    • Views: 2,760
    08-10-2013, 03:36 PM Go to last post

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