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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: 196,968
    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: 66,862
    09-30-2005, 09:44 AM Go to last post
  1. 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: 2,036
    09-22-2012, 10:01 PM Go to last post
  2. 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: 1,573
    09-22-2012, 03:36 PM Go to last post
  3. 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: 1,279
    09-22-2012, 01:15 PM Go to last post
  4. 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: 3,077
    09-22-2012, 09:21 AM Go to last post
  5. 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: 1,060
    09-21-2012, 08:57 PM Go to last post
  6. 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: 1,191
    09-21-2012, 04:26 PM Go to last post
  7. 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: 5,434
    09-21-2012, 04:11 PM Go to last post
  8. Probability or statistical expected average: How to determine a success or failure?!

    Hey, (I am a NOOB in statistics) I am trying to determine whether my experiment results indicate a success or just turns out as it would have...

    Started by Cabula‎, 09-21-2012 05:07 AM
    • Replies: 1
    • Views: 1,282
    09-21-2012, 08:08 AM Go to last post
  9. Which paired test?

    Hi, I have a little slightly complicated analysis which I want do describe in form of another similar but clearer example: I have 15 different...

    Started by JRadinger‎, 09-20-2012 10:07 AM
    anova, paired
    • Replies: 1
    • Views: 1,154
    09-21-2012, 02:45 AM Go to last post
  10. Standardized Value Issues

    Hello talkstats! So I took a test the other day and didn't do so well. I'm trying to go over the test now with a partner and neither of us can...

    Started by katcity‎, 09-20-2012 07:30 PM
    • Replies: 0
    • Views: 1,477
    09-20-2012, 07:30 PM Go to last post
  11. Converting historical amounts of currency to other currencies in real terms.

    Hi guys, nice to be here. im analysing government expenditure and one of the sources ive used has calculated the expenditure 1995 up to 2009...

    Started by KMass1‎, 09-20-2012 01:33 PM
    • Replies: 0
    • Views: 1,556
    09-20-2012, 01:33 PM Go to last post
  12. How best to display Dprimes scores using bar graph

    moved to Psychology Statistics forum section...

    Started by saratogacoach‎, 09-20-2012 06:38 AM
    • Replies: 0
    • Views: 1,323
    09-20-2012, 06:38 AM Go to last post
  13. Percentile of SAMPLE mean

    Can someone please explain to me how to work out the percentile of the sample mean (diff to confidence intervals which is pop mean) The Q is: ...

    Started by kstone‎, 09-19-2012 10:26 PM
    • Replies: 8
    • Views: 16,747
    09-20-2012, 04:52 AM Go to last post
  14. Would my calcuation of the expectation of an expoentitated random variable work? HELP

    Hi, I am trying to find the expectation of a random variable X defined as the following: Xi = 1 or -1. with P(X=1) = 0.5 and P(X=-1) = 0.5 ...

    Started by graduatemath‎, 09-20-2012 01:18 AM
    • Replies: 1
    • Views: 1,458
    09-20-2012, 01:26 AM Go to last post
  15. Need Help with hw problem

    Derive the formula for the variance of Y-hat. Show at least two steps. I know I am looking for Var(b0 hat + B1hatXo) I just don't know how to get...

    Started by mlefkee2‎, 09-19-2012 10:17 PM
    • Replies: 0
    • Views: 1,063
    09-19-2012, 10:17 PM Go to last post
  16. Looking for help! which software to use??

    Hi Guys, I have a small amount of experience using SPSS and am currently using this for some work on statistical analysis of sports injuries in a...

    Started by Adam25‎, 09-18-2012 04:48 AM
    • Replies: 4
    • Views: 1,330
    09-19-2012, 08:11 PM Go to last post
  17. help with anova/manova/ancova???

    Hello, I'm a first time poster, please excuse my long-winded question! I am trying to analyze the results of my experiment which is set up as...

    Started by gigistats‎, 09-19-2012 07:13 PM
    • Replies: 0
    • Views: 1,554
    09-19-2012, 07:13 PM Go to last post
  18. IRT question

    I am not sure item response theory is statistics as defined here or not:shakehead but I have a question to correct on my comps that I have been...

    Started by noetsi‎, 09-15-2012 03:32 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 4,141
    09-19-2012, 03:11 PM Go to last post
  19. How to prove that microbiological growth curves significant differ from each other?

    Hello everyone, A while ago I innoculated 3 pieces of the same chocolate each with another bacterial culture (every time in the same...

    Started by jensvdl‎, 09-18-2012 06:32 PM
    • Replies: 1
    • Views: 1,464
    09-19-2012, 10:12 AM Go to last post
  20. how to calculate adjusted standard error to report with adjusted means for ancova

    How to calculate adjusted mean and adjusted std error? I'm using regression as ancova in R as below. Condition is coded: 0 = control, and 1 =...

    Started by Timcod‎, 09-19-2012 10:07 AM
    adjusted mean, ancova, help needed, regression, standard error
    • Replies: 0
    • Views: 3,513
    09-19-2012, 10:07 AM Go to last post
  21. Multiple Regression Number of Variables and Predictors?

    Hi Could someone please help me with this question I've been staring at my textbook for hours and it doesn't explain how to find no of variable or...

    Started by silentmin‎, 09-19-2012 02:06 AM
    multiple, multiple regression, predictors, regression, variables
    • Replies: 1
    • Views: 3,488
    09-19-2012, 03:29 AM Go to last post
  22. Binomial pdf and estimator

    The following is the problem: Five hundred adults are asked whether they favor a bipartisan campaign finance reform bill. If the true proportion...

    Started by doubleh87‎, 09-18-2012 08:35 PM
    • Replies: 1
    • Views: 2,796
    09-19-2012, 02:32 AM Go to last post
  23. Correlation of means

    How comes that two variables positively correlated in levels are negatively correlated in mean? That is: let x, y be two observed variables and X^,...

    Started by mmgg‎, 09-18-2012 01:52 PM
    • Replies: 2
    • Views: 1,007
    09-19-2012, 12:31 AM Go to last post
  24. Effect size for robust ANOVA?

    Hi - I am using one-way ANOVA but there is violation of homogeneity of variances (tested using Levene's statistic) and unequal group sizes. ...

    Started by marika‎, 09-17-2012 01:03 PM
    • Replies: 2
    • Views: 3,831
    09-18-2012, 02:29 PM Go to last post
  25. What hypothesis is regression intercept-only model testing?

    In a regression model without any predictors, the intercept is subject to a hypothesis test. For example: summary((lm(mpg~1, data = mtcars))) ...

    Started by Layo909‎, 09-18-2012 02:56 AM
    • Replies: 2
    • Views: 6,435
    09-18-2012, 07:59 AM Go to last post
  26. Help on analysis of variance

    I have tested ventilators performances on a lung model. I have tested 5 differents ventilators models. I have tested 3 different machines for each...

    Started by checco76‎, 09-18-2012 03:09 AM
    • Replies: 1
    • Views: 1,425
    09-18-2012, 04:22 AM Go to last post
  27. Non-factorial ANOVA?

    Here's my design: Each participant is trained to discriminate 2 categories in each of 2 domains. In one of the domains, they receive training...

    Started by baixiwei‎, 09-17-2012 09:23 PM
    • Replies: 0
    • Views: 1,504
    09-17-2012, 09:23 PM Go to last post
  28. Economic Significance

    Hi guys, Currently I am doing a research about elimination of etfs. Now I have to run a logistic regression using stata. However, I read somewhere...

    Started by Statahulk‎, 09-12-2012 07:26 AM
    • Replies: 4
    • Views: 4,120
    09-17-2012, 01:28 PM Go to last post
  29. Bonferroni-Holm correction for Psychology

    Hi All, I was hoping someone could explain to me, in the simplest language possible, what a Bonferroni-Holm correction is, why and under what...

    Started by bozatron‎, 09-17-2012 01:15 AM
    • Replies: 2
    • Views: 1,849
    09-17-2012, 09:24 AM Go to last post
  30. Using multiple P-values

    I have a number of p-values from permutation tests I've done on my data. One p-value for each recording. Can I compile these values to test for...

    Started by killbot2000‎, 09-17-2012 04:57 AM
    comparison, p-value, significance
    • Replies: 1
    • Views: 1,285
    09-17-2012, 07:34 AM Go to last post
  31. Medical Statistic - Help a Surgeon out!

    Ok here's your chance, yes your smarter. I have tried to calculate my own p-value for some clinical research. Can't do it. I can operate on your...

    Started by zchild‎, 09-16-2012 11:44 PM
    • Replies: 0
    • Views: 1,163
    09-16-2012, 11:44 PM Go to last post
  32. HELP!!! Chi-Square Tests

    What is the difference between Homogeneity of proportions across two or more groups, Test of independence, and Goodness of fit test? Also, how...

    Started by KLaird‎, 09-16-2012 08:41 PM
    chi-square, chi-square help, p-value, stat
    • Replies: 0
    • Views: 867
    09-16-2012, 08:41 PM Go to last post
  33. help please

    Hi I'm not really sure where to start for this question.. Q. A random sample is obtained from a normal population with unknown mean μ, but...

    Started by ch5112‎, 09-12-2012 05:02 PM
    • Replies: 4
    • Views: 2,191
    09-16-2012, 04:17 PM Go to last post
  34. Linear independence

    I'm used to the following definition of linear independence: a family of vectors is linearly independent if none of them can be written as a linear...

    Started by mmgg‎, 09-16-2012 04:10 PM
    • Replies: 0
    • Views: 1,229
    09-16-2012, 04:10 PM Go to last post
  35. Cronbach's alpha

    Hi everyone, I am trying to quantify the rater-reliability for a test with three judges and two output alternatives. From what I have read this...

    Started by Macarena‎, 09-16-2012 02:10 PM
    • Replies: 0
    • Views: 929
    09-16-2012, 02:10 PM Go to last post
  36. statistical correlation

    Years ago I saw an 'interesting' set of data. The data presented an analysis of stock market (NYSE) performance versus an unnamed variable, x. The...

    Started by terps‎, 09-15-2012 11:34 PM
    • Replies: 0
    • Views: 1,240
    09-15-2012, 11:34 PM Go to last post
  37. Interpreting glm results

    Hi guys, I've performed my first ever glm (proud moment!) However.... I haven't a clue what the results mean Can someone please help me...

    Started by SoSaysBex‎, 09-03-2012 08:05 PM
    • Replies: 5
    • Views: 3,515
    09-15-2012, 06:10 AM Go to last post
  38. Normal Distribution and Grade Cut-offs

    Hello, I tried googling this question, watching how-to videos, and read over the chapter in my textbook several times but I cannot seem to understand...

    Started by sarah1‎, 09-14-2012 12:05 PM
    cut-off, mean standard deviation, normal distribution, statistics, z-score
    • Replies: 6
    • Views: 3,018
    09-14-2012, 04:47 PM Go to last post
  39. Will one-way ANOVA and Tukey HSD work?

    Hi all. This isn't a homework problem, but one I'm encountering at work. The experiment goes like this: We have 4 animals. Cells from each animal...

    Started by stickperson‎, 09-14-2012 02:42 PM
    • Replies: 2
    • Views: 1,600
    09-14-2012, 04:06 PM Go to last post
  40. [SOLVED] Assumptions of an ANOVA

    1. I could google this but in my past searches I get conflicting stuff and wrong stuff. So I'll state what I think are the assumptions of ANOVA &...

    Started by trinker‎, 09-13-2012 08:23 PM
    anova, assumptions
    • Replies: 4
    • Views: 1,744
    09-14-2012, 01:02 AM Go to last post
  41. kurtosis and nongaussian

    Hi, all I am looking into kurtosis of random variables. As far as I know, kurtosis for gaussian random variables is zero, and for most of...

    Started by Wenlong‎, 09-13-2012 05:42 PM
    • Replies: 2
    • Views: 1,993
    09-13-2012, 07:00 PM Go to last post
  42. How many measurements needed to distingish between two outcomes?

    I have a historical dataset of about 500 measurements. Datapoints that turned out to indicate A or B, each have a distribution from which I computed...

    Started by kureot‎, 09-13-2012 03:29 PM
    gaussian distribution, prediction, sample design, sample size, students t test
    • Replies: 2
    • Views: 1,350
    09-13-2012, 04:41 PM Go to last post
  43. Creating Class Width From Raw Data.. please help

    How do I set up classes from the data below, when the class width is 2: 10 1 3 5 4 7 S 1 0 9 11 1 5 4 1 7 7 11 0661 5 7 10 1 1 5 6 0 ...

    Started by JasonQuinn1992‎, 09-13-2012 10:26 AM
    • Replies: 1
    • Views: 1,219
    09-13-2012, 12:24 PM Go to last post
  44. Exclamation Multinomial Logistic Regression

    Hello, I am planning to run a logistic regression and I need some help if you can. So I have a IV for example family income. I needed to divide it...

    Started by kasradzegiorgi‎, 09-10-2012 09:11 AM
    • Replies: 2
    • Views: 1,177
    09-13-2012, 03:17 AM Go to last post
  45. CI 95% graph

    Hi The question is: (data was given for gender and speed) Produce an appropriate graph to determine if it is reasonable to assume that the...

    Started by ch5112‎, 09-13-2012 12:49 AM
    • Replies: 0
    • Views: 2,183
    09-13-2012, 12:49 AM Go to last post
  46. analyzing scatter plot...help!

    Hi. I'm trying to analyze the scatter plot.. There are three data that i had to use for this question: height, gender and right hand span From...

    Started by ch5112‎, 09-12-2012 07:32 PM
    • Replies: 2
    • Views: 1,631
    09-12-2012, 09:16 PM Go to last post
  47. hypothesis

    Thanks for you help...can you help me with other 5 questions too?? Q1.A significance test gives a p-value of 0.04 when testing a null hypothesis....

    Started by ch5112‎, 09-12-2012 06:00 AM
    • Replies: 2
    • Views: 1,816
    09-12-2012, 04:48 PM Go to last post
  48. a problem regarding maximum and minimum of two positive random variables

    Suppose X and Y are two positive random numbers. Define U = max(X, Y ) and V = min(X, Y ) Show that: (a) E(X)E(Y ) >= E(U)E(V ): (b) Var(X) +...

    Started by tatai‎, 09-12-2012 11:21 AM
    • Replies: 1
    • Views: 1,240
    09-12-2012, 11:41 AM Go to last post
  49. hypothesis testing

    Hi I need some help with questions from prevous exam..they dont have answers can anyone help please? Q1. A significance test was performed to...

    Started by ch5112‎, 09-12-2012 05:51 AM
    • Replies: 3
    • Views: 4,737
    09-12-2012, 11:34 AM Go to last post
  50. Simple simulation problem!

    Hi, I have a problem that will probably be very simple for the experts on this forum. I don't have any statistical background, so this is a bit too...

    Started by ser01‎, 09-10-2012 10:05 AM
    • Replies: 13
    • Views: 1,799
    09-12-2012, 09:57 AM Go to last post
  51. differences between frequencies

    Dear all, I'm trying to figure out how to best determine if there is a significant differences between how often a particular answer to a question...

    Started by poons‎, 08-30-2012 03:38 AM
    2 Pages
    1 2
    • Replies: 26
    • Views: 4,434
    09-12-2012, 03:41 AM Go to last post
  52. compare questionnaire responses of parents

    Hi all, I have a question with regard to comparing the responses of parents to a questionnaire on the home environment. The questionnaire is a set...

    Started by lucn‎, 09-11-2012 03:10 PM
    compare groups
    • Replies: 1
    • Views: 957
    09-12-2012, 03:06 AM Go to last post
  53. Food & Drug Administration (US) statistical regulations

    Hello, I want to know if there is anyone who knows about FDA regulations to do statistical tests? Or if anyone has a document about it?

    Started by expert4knowledge‎, 09-12-2012 01:42 AM
    • Replies: 0
    • Views: 883
    09-12-2012, 01:42 AM Go to last post
  54. Combinatorics Question

    I'm having a very tough time solving a problem for my probability class. Any help would be appreciated. Here's the problem: Your statistics...

    Started by cardsfan527‎, 09-11-2012 06:31 PM
    • Replies: 6
    • Views: 2,997
    09-11-2012, 09:42 PM Go to last post
  55. How to solve cumulative binomial distribution?

    The question is the following: Five independent samples, each of size n, are to be drawn from a normal distribution where s.d. (sigma) is known....

    Started by doubleh87‎, 09-11-2012 07:17 PM
    • Replies: 0
    • Views: 3,285
    09-11-2012, 07:17 PM Go to last post
  56. Find Outliers in Transaction Data

    Hi folks, I'm looking for your opinions on the best way to solve a need I have for finding outliers in a set of data. A while ago I wrote a...

    Started by DVC‎, 09-11-2012 02:23 PM
    • Replies: 0
    • Views: 2,835
    09-11-2012, 02:23 PM Go to last post
  57. Observed Test Equating

    Hi All, I run a quantitative Special Interest Group which has bi-monthly seminars. The most recent was an excellent one on observed test equating...

    Started by Lazar‎, 09-11-2012 01:33 AM
    • Replies: 0
    • Views: 1,168
    09-11-2012, 01:33 AM Go to last post
  58. Mediation with Structural Equation Modeling....

    First...Hello! My question is about how to test mediation with structural equation modeling. I know there is a way to test mediation with regression...

    Started by sampier85‎, 09-10-2012 01:47 PM
    help me!, structural equation model
    • Replies: 0
    • Views: 2,450
    09-10-2012, 01:47 PM Go to last post
  59. Likert Scale, basic tests

    Hello I have collected data using a questionnaire for the following a) Role played by a person b) years of experience c) type of work done ...

    Started by harry‎, 09-09-2012 09:20 PM
    likert scale, spss statistics, stats
    • Replies: 3
    • Views: 2,337
    09-10-2012, 10:00 AM Go to last post
  60. Question Mann Whitney u test- Interpretation help?

    Hi I have conducted a Mann Whitney u test to test to see if there is a difference between one of my variables and gender. The test shows there is...

    Started by Pippy‎, 09-08-2012 06:44 AM
    • Replies: 3
    • Views: 8,187
    09-10-2012, 02:45 AM Go to last post

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