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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: 197,080
    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: 66,915
    09-30-2005, 09:44 AM Go to last post
  1. Normal distribution - do it need to test that for Kendall's W

    Hello guys, i have a quick question, i am currently conducting my master thesis and am ranking some barriers according to their mean and median...

    Started by andih‎, 07-29-2013 04:05 AM
    • Replies: 0
    • Views: 1,191
    07-29-2013, 04:05 AM Go to last post
  2. Is using the Chi-squared test the right option here?

    Hi everyone, I hope this question isn't too long. I have some data that I need to statistically analyze and I think I've figured out the best way...

    Started by danadmiller‎, 07-28-2013 07:03 PM
    • Replies: 0
    • Views: 1,561
    07-28-2013, 07:03 PM Go to last post
  3. Software to Determine Data Distribution

    Does anyone know of any statistical program that takes a set of empirical data and determines what probability distribution it most closely matches?...

    Started by bscully‎, 07-22-2013 10:31 AM
    assesment, distribution, software
    • Replies: 6
    • Views: 1,518
    07-28-2013, 06:36 PM Go to last post
  4. Looking for some help on this problem. Finding mean and std. dev using split file

    I could really use some help on this problem. I am not completely understanding how to do this and it's online class so i don't have many options for...

    Started by van35‎, 07-28-2013 01:31 PM
    • Replies: 0
    • Views: 1,049
    07-28-2013, 01:31 PM Go to last post
  5. Help with PCA analysis

    Hey guys, I just recently learned about Principal Component Analysis, and needed help understanding my results. I have 27 different components,...

    Started by BigCypress‎, 07-28-2013 02:17 AM
    • Replies: 0
    • Views: 1,076
    07-28-2013, 02:17 AM Go to last post
  6. combining ranking statistics

    This isn't homework but it seems "beginner" enough to justify posting here. I'll frame this in terms of a competition among players, since I think...

    Started by discoross‎, 07-27-2013 11:19 PM
    • Replies: 0
    • Views: 1,136
    07-27-2013, 11:19 PM Go to last post
  7. single case designs

    Can you use conventional nonparametric tests (e.g. Friedman, Wilcoxon) to analyse data from single case deigns (e.g. ABA or multiple baseline)? The...

    Started by DaveP‎, 07-27-2013 04:22 AM
    • Replies: 1
    • Views: 917
    07-27-2013, 08:33 PM Go to last post
  8. How to determine the efficiency of method of moments estimator

    Ok, so I'm given a method of moments estimator for B, B~. I'm told it's an unbiased estimator of B. Now I need to determine if B~ is efficient and if...

    Started by phX‎, 07-27-2013 03:24 PM
    • Replies: 0
    • Views: 1,045
    07-27-2013, 03:24 PM Go to last post
  9. What asymmetric distribution represents this data?

    Hello, I have this data: Bin particle_240 1 0 2 0 3 0 4 0

    Started by KarinaArcuri‎, 07-26-2013 01:24 PM
    asymmetric, data distribution, distribution, statistic
    • Replies: 1
    • Views: 2,074
    07-26-2013, 08:12 PM Go to last post
  10. Three-Way Independent ANOVA or Repeated Measures ANOVA?

    Hello everyone, I am hoping someone can help guide me on the appropriate analyses to conduct on data I have collected. I have read several...

    Started by leh2686‎, 07-17-2013 10:40 PM
    • Replies: 1
    • Views: 6,622
    07-26-2013, 01:56 PM Go to last post
  11. Please have a look at my MLR Diagnostics

    I've created two multiple linear regression models for two different continuous outcome variables. The diagnostics look acceptable to me. Outcome for...

    Started by StatsClue‎, 07-24-2013 08:37 AM
    • Replies: 8
    • Views: 2,633
    07-26-2013, 01:35 PM Go to last post
  12. Help with suitability of F-test for model comparison and validation

    Dear All I have three sets of data, one measured and two predicted with different models. I need to answer three questions 1) is each set of...

    Started by craig3201‎, 07-26-2013 01:17 PM
    • Replies: 0
    • Views: 1,046
    07-26-2013, 01:17 PM Go to last post
  13. Sampling Procedure Help Needed for Constructing a Confidence Interval

    Hi all. Quick background: I am a 64 year old lady going back to college to get my Bachelor's. I haven't taken a college course in 30 years :shakehead...

    Started by jjonesfk‎, 07-18-2013 12:06 PM
    • Replies: 8
    • Views: 8,421
    07-26-2013, 12:49 PM Go to last post
  14. Controlling in Multiple linear regression- how sure that it's controlled?

    It is strongly felt that the effect of gender on outcome variable Y is due to the small size of females. I controlled for weight and the effect of...

    Started by StatsClue‎, 07-22-2013 01:38 AM
    • Replies: 6
    • Views: 1,702
    07-26-2013, 10:22 AM Go to last post
  15. Test the fit of rate data to a Poisson process

    How can you test the whether a collection of rate data is consistent with a Poisson process? I am investigating a random process which conceptually...

    Started by massena‎, 07-26-2013 10:00 AM
    exposure, poisson, rate
    • Replies: 0
    • Views: 1,206
    07-26-2013, 10:00 AM Go to last post
  16. Visualizing my Likert-type data with mean scores

    Hi, I am currently conducting analysis of survey results based on 5-point Likert items. What I want to do is analyze each item separately, and for...

    Started by Bauke‎, 07-25-2013 04:13 AM
    • Replies: 6
    • Views: 2,699
    07-25-2013, 05:28 PM Go to last post
  17. Two way Anova with replicates

    Hi, In the following expt I am pretty sure that I have to use a 2 way ANOVA but nevertheless any advice is welcome. I have exposed phytoplankton to...

    Started by helga55‎, 07-25-2013 04:12 PM
    anova, replicates
    • Replies: 0
    • Views: 2,198
    07-25-2013, 04:12 PM Go to last post
  18. I am LOST! Need help regarding regression line equation.

    So... I'm totally lost with this question. I know it has a positive correlation but it only gives me the regression line equation anyways, question...

    Started by JAYR‎, 07-22-2013 07:20 PM
    • Replies: 3
    • Views: 1,594
    07-25-2013, 04:07 PM Go to last post
  19. Guessing standard deviation from mean.

    I am constantly getting questions that give me the mean, and ONLY the mean, and I am then asked to guess that standard deviation. I am continually...

    Started by FollowTheFez‎, 07-25-2013 01:40 AM
    • Replies: 2
    • Views: 4,523
    07-25-2013, 03:06 PM Go to last post
  20. Exclamation Help! Looking for appropriate analysis for 2 points data set

    Title is pretty forward... I know I could use an ANOVA in theory, since I am looking at the change of my DV caused by an IV. The only thing that...

    Started by MelBee1985‎, 07-23-2013 03:43 PM
    anova, change, repeated measures, sas
    • Replies: 1
    • Views: 961
    07-25-2013, 12:29 PM Go to last post
  21. Likert item data- which test to use to see if there is a relationship between groups

    Hi, I have been given some data and I am trying to statistically analysis it. The data is from a survey in which 202 students were asked what is...

    Started by em234‎, 07-25-2013 10:45 AM
    chi square help what test, likert interpretation, pearson correlation, statistical help, what test
    • Replies: 0
    • Views: 1,265
    07-25-2013, 10:45 AM Go to last post
  22. Ryan Joiner

    FYI, I have excell calculation for RJ

    Started by tanchengchong‎, 07-25-2013 09:31 AM
    • Replies: 0
    • Views: 1,483
    07-25-2013, 09:31 AM Go to last post
  23. Which ANOVA to choose? 2 way repeated measurements ANOVA

    Hello I'm testing longitudinal data on 2 levels: - the model used to fit the parameter: model 1 to 5 - the age at which the data is fitted at...

    Started by ndb86‎, 07-25-2013 01:03 AM
    • Replies: 0
    • Views: 2,142
    07-25-2013, 01:03 AM Go to last post
  24. Age Adjustment Issue

    Hi Guys, Noob here. But i have this problem. I have a dataset with two different classification bands of age group and corresponding data. is...

    Started by eemrun‎, 07-24-2013 06:53 PM
    • Replies: 0
    • Views: 950
    07-24-2013, 06:53 PM Go to last post
  25. sample size calculation

    Hello, I need to calculate sample size for a crossover study. The previous data we have is from parallel studies. Can you please let me know what...

    Started by rk4‎, 07-24-2013 05:47 PM
    • Replies: 0
    • Views: 1,201
    07-24-2013, 05:47 PM Go to last post
  26. testing different models using the same group of longitudinal data

    Description of my research Longitudinal growth data are fitted using parametric models giving growthcurves. Differentiating these growthcurves...

    Started by ndb86‎, 07-24-2013 05:09 AM
    anova, correlation matrix, goodness-of-fit, longitudinal data, principal component
    • Replies: 2
    • Views: 1,537
    07-24-2013, 04:11 PM Go to last post
  27. Significance of pre-post and test-control groups in ttest

    Hi Guys, I'm working in an analytics firm where t-test is majorly followed for analyzing campaign data. We are tracking parameters like sales,...

    Started by pkdash83‎, 07-23-2013 11:48 AM
    • Replies: 4
    • Views: 5,128
    07-24-2013, 01:15 PM Go to last post
  28. Interpretation / Running of a loglinear analysis

    Hi, I am studying the interaction between 3 categorical variables: INITIAL Auditor (Big or small) SUBSEQUENT Auditor (Big, small or no change)...

    Started by unknownbomb‎, 07-24-2013 04:27 AM
    • Replies: 0
    • Views: 1,215
    07-24-2013, 04:27 AM Go to last post
  29. Hospital Assignment

    Hmmm, a little stuck here. Hope someone can help. I work for a hospital that's been trailing a new surgical procedure hoping to lower mortality...

    Started by scotchpie‎, 07-24-2013 02:55 AM
    • Replies: 1
    • Views: 1,316
    07-24-2013, 03:01 AM Go to last post
  30. Looking for a good and reasonable distribution model for this scenario

    I do a lot of recreational programming and I ran into this interesting scenario. The situation is similar to this: Let's say you are looking at...

    Started by thetalkativeman‎, 07-23-2013 04:18 PM
    • Replies: 1
    • Views: 1,065
    07-23-2013, 05:45 PM Go to last post
  31. Calibrating time-series simulations / backtests

    Suppose I have a time-series data generating process that I am trying to simulate. The simulations are controlled by 2 discrete variables: −3<= A<=3...

    Started by raco‎, 07-23-2013 05:21 PM
    calibration, simulation
    • Replies: 0
    • Views: 897
    07-23-2013, 05:21 PM Go to last post
  32. Joint PDF of X and a Function Y = g(X)

    Thakur here, My question is regarding the joint pdf of the input and output of a system. Lets say I have a system represented by a deterministic...

    Started by thakur47‎, 07-23-2013 03:32 PM
    function of rand var, joint distribution, system output
    • Replies: 1
    • Views: 1,438
    07-23-2013, 04:11 PM Go to last post
  33. Assistance required with transformations to normal distribution

    BACKGROUND: I have collected data on geese using 30min focal follows however my sample size is quite small (18). Independent variables are group...

    Started by Emzy‎, 07-20-2013 07:04 AM
    • Replies: 4
    • Views: 1,235
    07-23-2013, 07:28 AM Go to last post
  34. Calculating a % of a bell-shaped distribution.

    The typical amount of sleep per night for a student follows a bell-shaped distribution with a mean of 7 hours and a standard deviation equal to 1.7...

    Started by FollowTheFez‎, 07-17-2013 12:07 AM
    • Replies: 1
    • Views: 1,521
    07-23-2013, 04:14 AM Go to last post
  35. Finding the median of two median values of two five number summary.

    There are 16 cruisers weight boxers and 17 heavy weight boxers. Data: Crusierweight: Min: 204 Q1: 220 Median: 226 Q3: 230 Max: 250 Heavyweight:...

    Started by JAYR‎, 07-22-2013 01:39 PM
    • Replies: 1
    • Views: 1,359
    07-22-2013, 02:26 PM Go to last post
  36. Sample size and confidence. Problem.

    I want to solve this problem, but i'm not sure i understood everything i need and i'm applying the math properly. i got stuck on the...

    Started by magister‎, 07-22-2013 12:09 PM
    • Replies: 0
    • Views: 998
    07-22-2013, 12:09 PM Go to last post
  37. Comparing distributions (Kolmogorov–Smirnov?)

    I have two sets of data, S and T, both made up of people with a set of various attributes. S is much larger than T, and I would like to (a) draw a...

    Started by cab938‎, 07-22-2013 11:24 AM
    • Replies: 0
    • Views: 14,034
    07-22-2013, 11:24 AM Go to last post
  38. Does the computer overestimate mpg, if the vehicle is known to average 40 mpg?

    I was asked to compute a 95% confidence interval and I got 41.6 to 44.7. From the data, the sample mean xbar is 43.17, standard deviation is 3.5,...

    Started by gibson101‎, 07-21-2013 08:30 AM
    • Replies: 1
    • Views: 1,509
    07-22-2013, 10:33 AM Go to last post
  39. Linear regression analysis problem - almost solved but need some help

    I am trying to teach myself some statistics so I am working problems out of a textbook. I have figured out mostly everything I describe below, but I...

    Started by gman‎, 07-21-2013 06:38 PM
    • Replies: 1
    • Views: 1,986
    07-22-2013, 10:12 AM Go to last post
  40. Autocorrelation

    Yt = B0 + B1X1 + et was fit to a time-series data set using OLS. The residuals e^1, ..., e^n from the fit were then used ot create two new...

    Started by simplemts‎, 07-21-2013 05:25 PM
    • Replies: 1
    • Views: 1,009
    07-21-2013, 08:21 PM Go to last post
  41. Validating correctness of ranking algorithm

    Stats noob here working on an algorithm for ranking players in a tournament. I have a test set of players, each with a "skill" value. My...

    Started by numegil‎, 07-21-2013 02:59 AM
    • Replies: 0
    • Views: 1,395
    07-21-2013, 02:59 AM Go to last post
  42. Confirmation of correct test for repeated measures of ordinal data: Friedman's Test

    Dear Stats Community, I performed an experiment in which I measured the behavioral responses on an ordinal scale (1-4) of a group of non-human...

    Started by MMDixon‎, 07-18-2013 11:33 AM
    friedman test, ordinal data, repeated measurements
    • Replies: 2
    • Views: 1,679
    07-20-2013, 12:06 PM Go to last post
  43. How can i comment on the following graphs of Binomial distribution.

    I am using 'R' to draw the graph : par(mfrow=c(2,2)) graph(10,0.05) graph(20,0.05) graph(50,0.05) graph(200,0.05) How can i comment on...

    Started by Jesmin‎, 07-20-2013 04:16 AM
    binomial distribution, graph, statistics
    • Replies: 2
    • Views: 1,981
    07-20-2013, 07:44 AM Go to last post
  44. Application of Statistics

    Hi Every one, I want to carry out a research on how teaching methodology affect the performance of students in a secondary school. Please how...

    Started by taiwo.omoloba‎, 07-20-2013 04:59 AM
    • Replies: 0
    • Views: 1,108
    07-20-2013, 04:59 AM Go to last post
  45. Can I use ANOVA for counts (integers)?

    Hello, I have a crossed experimental design with two fixed effects: Neighbour/Stranger and Female/Male. The response variable is...

    Started by stweb‎, 06-13-2013 11:13 PM
    anova, integer, two-way
    • Replies: 1
    • Views: 2,814
    07-20-2013, 04:48 AM Go to last post
  46. Red face A causes B - B causes C - Does A cause C?

    Hi all! I have a simple problem with my two hypotheses: H1: Industry dynamic (A) positively influences competence (B). H2: Competence (B)...

    Started by GabrielBox‎, 07-16-2013 02:37 PM
    • Replies: 11
    • Views: 4,698
    07-19-2013, 06:28 PM Go to last post
  47. ANOVA or Correlation?

    Hi everyone, I'm researching foreign language classroom anxiety and with a 33-item 5-point likert scale and got stuck due to some discrepant...

    Started by Jamiryo‎, 07-17-2013 05:03 AM
    • Replies: 8
    • Views: 2,553
    07-19-2013, 03:22 PM Go to last post
  48. Hypothesis testing

    Hi, I need help with question number 4 & 5, just to start me off....Help please. I have done 1,2,and 3, the following info: Each month the...

    Started by rufus12‎, 07-19-2013 02:09 PM
    • Replies: 0
    • Views: 1,859
    07-19-2013, 02:09 PM Go to last post
  49. Three-way ANOVA interaction: Post-Hoc tests

    Hi There, I have a 2x3x4 repeated measured anova. I have a significant 3-way interaction, and I want to make sure that I am using the correct post...

    Started by luisa‎, 07-19-2013 09:44 AM
    post-hoc, three-way anova, three-way interaction
    • Replies: 0
    • Views: 3,810
    07-19-2013, 09:44 AM Go to last post
  50. Is this a regression analysis problem?

    Hi all! I have been working on a certain class of problems for a class project recently which I need a bit of help on. I'm not sure if this is the...

    Started by jlawrence6809‎, 07-18-2013 07:02 PM
    • Replies: 2
    • Views: 1,685
    07-18-2013, 08:44 PM Go to last post
  51. Question on factors/factor analysis (mods move if in wrong forum )

    I have a data set with 14 variables and have identified 4 underlying "factors". If I want to use these identified "factors" to do correlations and...

    Started by john_cappa‎, 07-11-2013 06:09 AM
    • Replies: 5
    • Views: 1,852
    07-18-2013, 04:17 PM Go to last post
  52. Appropriate graphical representation of a sample?

    Hi guys, its been a few years since I took statistics classes in college, so my memory is awfully fuzzy. I have a small set of data (30 points) that...

    Started by younggun‎, 07-18-2013 01:26 PM
    • Replies: 1
    • Views: 1,159
    07-18-2013, 01:29 PM Go to last post
  53. Can I use ANOVA when the independent variable is time/year?

    Assume my data looks like this Company---Year----Profit 1----------2008----54.5 1----------2009----57.7 1----------2010----58.5...

    Started by userfriendly‎, 07-18-2013 11:09 AM
    • Replies: 0
    • Views: 1,258
    07-18-2013, 11:09 AM Go to last post
  54. Splitting a pairwise matrix in R

    I have a pairwise matrix as follows #### sample matrix DF <- read.table(text="gene_ids A-B A-C A-D A-E B-C B-D B-E C-D C-E **D-E** ...

    Started by deschisandy‎, 07-18-2013 02:54 AM
    r statistics
    • Replies: 2
    • Views: 1,488
    07-18-2013, 05:03 AM Go to last post
  55. Proof - SSReg

    I have already proven that y^-bar equals y-bar. Now, I am tasked with showing that: SSreg = SUM(y_i^ - y^-bar)(y_i - y-bar) given y^-bar =...

    Started by simplemts‎, 07-17-2013 10:22 PM
    • Replies: 3
    • Views: 3,636
    07-18-2013, 12:44 AM Go to last post
  56. Doubts on normality testing

    my sample size is 66. i had some doubts when doing normality testing. I realised that there is a difference when i put in various domain of...

    Started by wyl‎, 07-17-2013 07:48 PM
    • Replies: 0
    • Views: 861
    07-17-2013, 07:48 PM Go to last post
  57. Calculating factor scores from CFA?

    I have been scouring the Internet trying to find guidance on how to calculate factor scores for participants after running a CFA. I have found info...

    Started by Little bird‎, 07-17-2013 06:27 PM
    • Replies: 3
    • Views: 2,853
    07-17-2013, 07:32 PM Go to last post
  58. Controlling False Discovery Rate (FDR) in Regression with Correlated IVs

    I am looking for a procedure/code to control FDR in a multiple regression analysis, including 1 DV and 28 IVs (some of them interaction terms). Some...

    Started by mesdaghi‎, 07-17-2013 12:33 PM
    fdr, multiple regression
    • Replies: 0
    • Views: 1,273
    07-17-2013, 12:33 PM Go to last post
  59. Question Choosing statistical method for interpretation of gas flux measurements

    Hello, :wave: I am having problems finding a method that could be used to analyse gas fluxs (unit being grams of CO2 per square meter per hour)....

    Started by lord_jarski‎, 07-17-2013 07:26 AM
    • Replies: 0
    • Views: 940
    07-17-2013, 07:26 AM Go to last post
  60. Index forecast in R

    Hey - I have heard of a method in SAS to make forecasts on indices (ie. wage-, steel price-, oil price indices etc). The command is called STEPAR...

    Started by massi‎, 07-17-2013 07:24 AM
    • Replies: 0
    • Views: 971
    07-17-2013, 07:24 AM Go to last post

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