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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: 197,257
    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: 67,020
    09-30-2005, 09:44 AM Go to last post
  1. permutations and confidence intervals

    Hello! I am in need of a little guidance on a stat problem... I've performed a permutation on two data sets, in R, regarding sunblock efficacy,...

    Started by kweb313‎, 02-15-2013 10:14 PM
    confidence interval, homework, homework help, permutation
    • Replies: 0
    • Views: 1,375
    02-15-2013, 10:14 PM Go to last post
  2. Unhappy Homework Help

    The problem is: Consider the experiment of tossing two dice. Let Y denote the absolute difference of the upturned faces. A) Find the mean and...

    Started by amandaw‎, 02-15-2013 08:20 PM
    expected value, variance
    • Replies: 3
    • Views: 1,199
    02-15-2013, 09:55 PM Go to last post
  3. Fixed and random effect model?

    I've come across these model names in the literature and don't have that much background info on the topic. I was reading some definitions I found by...

    Started by Jka‎, 02-15-2013 11:03 AM
    • Replies: 0
    • Views: 1,003
    02-15-2013, 11:03 AM Go to last post
  4. Power analysis for correlation study

    Hello, I am in the process of planning a clinical study looking for a correlation between two different behavioral measurements. In order to plan...

    Started by facetious1212‎, 02-14-2013 04:31 PM
    • Replies: 0
    • Views: 2,333
    02-14-2013, 04:31 PM Go to last post
  5. How to convert two particle bivariate distribution to a single variable distribution

    Hello, In physics when studying identical particles bivariate probability density functions arise that describe the position of each particle....

    Started by Staty‎, 02-14-2013 03:09 AM
    physics, probability, statistics
    • Replies: 2
    • Views: 1,595
    02-14-2013, 12:28 PM Go to last post
  6. repeated measures ANOVA - Design matrix

    Hi, I am working on repeated measures ANOVA for the data I have gathered. I created my table and I understood how to apply the technique but I...

    Started by miaw650‎, 02-13-2013 04:22 PM
    • Replies: 6
    • Views: 3,232
    02-14-2013, 09:52 AM Go to last post
  7. Question

    Bare with me. 42 43 46 46 47 47 48

    Started by FC Stats‎, 02-13-2013 07:05 PM
    • Replies: 3
    • Views: 1,210
    02-13-2013, 10:36 PM Go to last post
  8. I am so lost

    I am in the fourth week of 5 week course in Statistics and I do not understand t scores, ANOVA or f score Can anyone explain it to be in simple...

    Started by songbird‎, 02-13-2013 06:18 PM
    • Replies: 1
    • Views: 1,531
    02-13-2013, 06:26 PM Go to last post
  9. Hosmer and Lemeshow Test

    How do you discussion the vaule for the Hosmer-Lemeshow goodness of fit in a logistic regression? Hosmer and Lemeshow Test Chi-square df Sig. 1)...

    Started by fishfish‎, 02-12-2013 06:27 PM
    hosmer and lemeshow test
    • Replies: 4
    • Views: 6,001
    02-13-2013, 03:02 PM Go to last post
  10. Reverse Coding

    Hey guys, new to this site and could use some help. im using the IES (Impact of Events scale by Horowitz 1979) in a study and I cant find anywhere in...

    Started by Shin7‎, 02-13-2013 10:41 AM
    • Replies: 2
    • Views: 1,970
    02-13-2013, 11:02 AM Go to last post
  11. Principle component analysis

    Hi, Can we use Principle component analysis for non normal data? Or Is there sample size limitation for Principle component analysis? Thanks,...

    Started by Poonam‎, 02-13-2013 04:30 AM
    • Replies: 0
    • Views: 914
    02-13-2013, 04:30 AM Go to last post
  12. No critical values exist for this special case note

    Hi, I have a Question. I used the ExpertFit software for applying Anderson Darling Test on the data. Particularly, for checking if the data...

    Started by miaw650‎, 02-13-2013 01:35 AM
    • Replies: 0
    • Views: 1,079
    02-13-2013, 01:35 AM Go to last post
  13. Some Help

    Please. I know how to find the least squares regressions on my calc. The residuals is what is giving me a problem. I know how to find that as...

    Started by FC Stats‎, 02-12-2013 09:49 PM
    • Replies: 2
    • Views: 1,167
    02-12-2013, 10:07 PM Go to last post
  14. can anyone explain this?

    I am a new user to Systat 13 and I am becoming familiar with logistic regression. However I am unclear what "reference levels" are and how this...

    Started by bgaynes‎, 02-12-2013 09:21 PM
    • Replies: 0
    • Views: 1,266
    02-12-2013, 09:21 PM Go to last post
  15. Best way to determine if replication helped

    I am trying to figure out a way to help show me that having two reps in an experiment is better than one rep. I remember doing a blocking efficiency...

    Started by gradIIndy‎, 02-09-2013 11:07 PM
    • Replies: 11
    • Views: 1,780
    02-12-2013, 08:35 PM Go to last post
  16. Dental Grad Student needs help with statistics

    Hi everyone, I'm a grad student in dental school. I am working on an experiment that might be a little difficult to explain, so let me give you...

    Started by TPJ‎, 02-12-2013 05:52 PM
    • Replies: 1
    • Views: 1,367
    02-12-2013, 07:56 PM Go to last post
  17. Some Help on My Ti84

    I am trying to do the Least-Square Regression(you know where that line goes through) but that line is not coming up. I was doing my problems fine...

    Started by FC Stats‎, 02-12-2013 05:47 PM
    • Replies: 1
    • Views: 1,125
    02-12-2013, 06:40 PM Go to last post
  18. Sufficient Statistic for θ

    Hey guys, So Im looking for a sufficient statistic for θ for U(θ, θ+1) Here's what I was thinking. T(X^n)=(min X_{i},max X_{i}) since the pdf is...

    Started by calculuskid1‎, 02-11-2013 09:59 PM
    • Replies: 11
    • Views: 42,216
    02-12-2013, 04:48 PM Go to last post
  19. Sample design problem

    A healthcare provider has been paid on N claims for certain health services, some of which may have been unauthorized. I must draw a sample of n...

    Started by Shotokan‎, 02-12-2013 02:59 PM
    audit sampling, pps sampling, sample design, sample size, sampling
    • Replies: 0
    • Views: 1,335
    02-12-2013, 02:59 PM Go to last post
  20. What to do when the predictors are not what I expected (when the model is fine)?

    I would try to clarify the problem and then ask the questions. The problem (variable names are masked due to confidentiality): I ran a binary...

    Started by victorxstc‎, 02-05-2013 05:43 PM
    2 Pages
    1 2
    multicollinearity, objective, regression, subjective
    • Replies: 24
    • Views: 4,731
    02-12-2013, 11:16 AM Go to last post
  21. Added-Variable Plot for Panel Data

    Dear all, in Frees (2004): "Longitudinal and Panel Data" there is a short description of a procedure for Added-Variable or partial regression...

    Started by ARDE‎, 02-12-2013 07:46 AM
    added variable plot, panel data, partial regression plot
    • Replies: 0
    • Views: 1,418
    02-12-2013, 07:46 AM Go to last post
  22. Finding an appropriate sample size?

    Hi, I'd really like some help on the following issue - I've been searching the internet for over two hours now, so I'm either completely oblivious to...

    Started by breepi‎, 02-11-2013 06:11 PM
    • Replies: 1
    • Views: 1,743
    02-11-2013, 10:09 PM Go to last post
  23. Marginal Gauss Distribution

    Hello, I am a little confused with marginal gauss distribution. According to what i find through internet and teacher notes, the marginal...

    Started by ihavename‎, 02-11-2013 06:18 PM
    • Replies: 1
    • Views: 1,873
    02-11-2013, 07:15 PM Go to last post
  24. Thumbs up help with lots of data and minitab 16

    Hi, i need to do a number of analysis on a large amount of data, minitab 16 looks like the easiest to get to grips with from what i have seen so far...

    Started by icce‎, 02-11-2013 02:39 PM
    • Replies: 0
    • Views: 1,012
    02-11-2013, 02:39 PM Go to last post
  25. A Question about Regression analysis

    Hello! If only pretest scores are used as a covariate in a pre-posttest experimental study (& a number of other relevant independent variables can...

    Started by KathyJ‎, 02-05-2013 12:49 PM
    • Replies: 5
    • Views: 1,768
    02-11-2013, 10:08 AM Go to last post
  26. If interaction term is not significant???

    If in a 2-way ANOVA, main effect of group is significant & main effect of gender & interaction effect (gender x group) are not, then can the...

    Started by KathyJ‎, 02-11-2013 06:23 AM
    • Replies: 1
    • Views: 3,058
    02-11-2013, 10:02 AM Go to last post
  27. General Question Regarding Construction of Confidence Interval

    Hi! I have a very basic question regarding confidence intervals. Given I want to construct a confidence Interval for the expected value mu of...

    Started by Miau Piau‎, 02-11-2013 06:42 AM
    confidence interval
    • Replies: 0
    • Views: 1,899
    02-11-2013, 06:42 AM Go to last post
  28. Fixing a threshold to create contingency tables for Cochran–Mantel–Haenszel test

    I have two continuous variables, X, and Y, and create their contingency table by using the median of each variable as a threshold. I repeat this...

    Started by nogale‎, 02-11-2013 03:22 AM
    contingency tables, mantel–haenszel test, threshold
    • Replies: 0
    • Views: 11,992
    02-11-2013, 03:22 AM Go to last post
  29. Please help me with multiple comparisons

    Hello, I just have a quick question understanding multiple comparisons and I'd appreciate any help because I'm on the verge of failing :( I'm...

    Started by ellenmichellen‎, 02-11-2013 12:39 AM
    • Replies: 0
    • Views: 1,006
    02-11-2013, 12:39 AM Go to last post
  30. Some help on Zscore

    .97 2.47 3.94 4.11 5.79 1.14 2.78 3.97 4.77 6.14 1.85 3.41 4.00 5.22 6.28 2.34 3.48 4.02 5.50 7.69 Compute the z-score...

    Started by FC Stats‎, 02-08-2013 08:28 PM
    • Replies: 6
    • Views: 1,801
    02-11-2013, 12:02 AM Go to last post
  31. Percentage equivilant query - Actual commission at stake - Someone clever please help

    Thank you in advance to anyone who can give me the answer. PLEASE CAN SOMEONE OUT THERE HELP ME, I HAVE HAD 57 VIEWS AND NO REPLIES? My sales...

    Started by RedPoolCool‎, 02-10-2013 06:00 PM
    • Replies: 0
    • Views: 992
    02-10-2013, 06:00 PM Go to last post
  32. Finding estimated standard error

    Let X_{1},...,X_{n} ~ F and let \hat{F} be the empirical distribution function. Let a<b fixed numbers, define θ = T(F) = F(b) − F(a). Let θˆ =...

    Started by farmeruser1‎, 02-10-2013 10:45 AM
    • Replies: 0
    • Views: 803
    02-10-2013, 10:45 AM Go to last post
  33. Confusion regarding sampling from a distribution and Variance

    Hi all, I have a query regarding sampling from a hypothetical distribution, lets say the standard normal distribution. If I remove a single IID...

    Started by distribution‎, 02-10-2013 05:30 AM
    • Replies: 1
    • Views: 1,333
    02-10-2013, 09:45 AM Go to last post
  34. combine probability function and PDF

    I have a function describing probability of an event happening as a function of value X (p=0 if x<d;p=x-d if d<x<2d; p=1 if x>2d), and lognormal...

    Started by buchenstein‎, 02-10-2013 05:21 AM
    • Replies: 0
    • Views: 1,985
    02-10-2013, 05:21 AM Go to last post
  35. Consistent MLE of a U(0, θ)

    So the question is: Let X1,.., Xn ∼ U(0, θ). Show that the MLE is consistent. Hint: Let Y=max {X1,... ,Xn}, for any c, P(Y <c)=P(X1 <c,X2...

    Started by calculuskid1‎, 02-09-2013 04:19 PM
    • Replies: 11
    • Views: 58,460
    02-09-2013, 09:14 PM Go to last post
  36. degrees of freedom

    hi could someone please explain degrees on freedom and also if for example you have a high degree of freedom a total of 139 what does this mean?...

    Started by zakki‎, 02-09-2013 07:13 PM
    • Replies: 3
    • Views: 2,251
    02-09-2013, 08:22 PM Go to last post
  37. Assessing variability between non-normally distributed samples

    I am trying to assess the difference in the dispersion or variance of 2 datasets taken from different sites. Because they are not normally...

    Started by volatile.‎, 02-08-2013 10:59 PM
    • Replies: 0
    • Views: 1,244
    02-08-2013, 10:59 PM Go to last post
  38. Correlating values to different characteristics

    Hello, I'm trying to figure out the best way to correlate a number of values against a set of discrete characteristics for a small population. In...

    Started by Balzac‎, 02-08-2013 05:48 PM
    • Replies: 0
    • Views: 1,006
    02-08-2013, 05:48 PM Go to last post
  39. Determining best ANOVA Interaction Term and Understanding in Model

    Hi. I am testing an experiment of 400 Entries that have each been subjected to two inoculation methods (treatments). I know that my entries will...

    Started by gradIIndy‎, 02-08-2013 05:17 PM
    • Replies: 0
    • Views: 1,127
    02-08-2013, 05:17 PM Go to last post
  40. Determining the differences in risk across firms

    For my project, I need to create a regression model and evaluate the differences in risk across firms, where risk is measured as stdev of returns. ...

    Started by darkblue‎, 02-06-2013 08:38 AM
    • Replies: 4
    • Views: 1,852
    02-08-2013, 02:42 PM Go to last post
  41. Calculating possible combinations

    Hi, I have a question regarding calculations. This involves one question on a survey. The question is made up of 17 different subquestions. For...

    Started by Sheesh19‎, 02-08-2013 12:58 PM
    • Replies: 1
    • Views: 1,127
    02-08-2013, 01:16 PM Go to last post
  42. Negative fold change on standardized data.Is "uncentering" data the right solution?

    Hi all, Hope this finds you all well. I work with large biological data sets and I have bumped into a most likely trivial problem. I am not sure...

    Started by JCA‎, 02-08-2013 12:04 PM
    • Replies: 0
    • Views: 1,600
    02-08-2013, 12:04 PM Go to last post
  43. Confidence interval ratio/proportion?

    Hi, I'm having a question concerning a confidence interval for a percentage share and I would appreciate if someone could help me. I have data...

    Started by sternchen‎, 02-07-2013 08:43 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 3,227
    02-08-2013, 09:11 AM Go to last post
  44. Randomized Response Question Help

    Hello! I'm experiencing difficulty with the following question and would appreciate help. It is a randomized response, which allows respondents...

    Started by TheDaezy‎, 02-07-2013 07:13 PM
    • Replies: 0
    • Views: 1,128
    02-07-2013, 07:13 PM Go to last post
  45. Exclamation NEED HELP: how to present results from different tests in one table

    Hey everyone, need some help. I have a complex hypothesis that tries to determine what type of tweets by nonprofit organizations elicit the most...

    Started by dutchinrichmond‎, 02-07-2013 04:40 PM
    • Replies: 2
    • Views: 1,913
    02-07-2013, 06:40 PM Go to last post
  46. Need some guidance

    I have run an experiment and need to know how to analyze the data. The experiment had 14 treatments and was rated at 3 set dates after treatment....

    Started by Esso82‎, 02-07-2013 05:13 PM
    • Replies: 0
    • Views: 1,671
    02-07-2013, 05:13 PM Go to last post
  47. SAS repeated measures ANOVA, comparison of within-time effects?

    Hey guys, this is my first post, so thanks in advance for reading. I am using SAS, and comparing the effects of a drug on a biological measure,...

    Started by cdhowar‎, 01-15-2013 06:52 PM
    anova, code, repeated measures, repeated measures anova, sas
    • Replies: 2
    • Views: 2,319
    02-07-2013, 03:06 PM Go to last post
  48. Is One-way ANOVA appropriate for my data?

    I was given the following question: "A trial was conducted to compare a shampoo (treatment A) with a placebo shampoo (treatment B). The subjects...

    Started by element975‎, 02-07-2013 07:18 AM
    • Replies: 3
    • Views: 1,814
    02-07-2013, 02:43 PM Go to last post
  49. Method of Moments: Can Variance be Included in Estimator?

    The question is: Suppose that X_1,X_2,\cdots,X_n are i.i.d random variables on the interval with the density function ...

    Started by Slime‎, 02-07-2013 12:13 AM
    • Replies: 1
    • Views: 1,442
    02-07-2013, 04:49 AM Go to last post
  50. t-test on percentage

    Hi all, Pretty simple question: I have two mean performance scores in percent, one is 70% +/- 3(SEM) and one is 95% +/- 1. Someone said I...

    Started by nabs‎, 02-06-2013 09:16 PM
    normal distribution, percent, percentage, student's, t-test
    • Replies: 2
    • Views: 3,195
    02-07-2013, 12:32 AM Go to last post
  51. correlation of 3 variables

    X is negative correlate with Y, and X is negative correlate with Z, the question is: is it possible that Y is negative correlate with Z? Give an...

    Started by pepsico007‎, 02-06-2013 10:10 AM
    • Replies: 11
    • Views: 2,856
    02-06-2013, 08:45 PM Go to last post
  52. Cross correlation or time lag in mixed models (SPSS)

    Hi, Is it possible to implement a time lag for fixed or random effects (like a cross correlation) when performing a mixed model analysis in SPSS...

    Started by bigshrimp‎, 02-06-2013 05:54 PM
    • Replies: 0
    • Views: 4,504
    02-06-2013, 05:54 PM Go to last post
  53. calculating confidence interval bands for a normal probability plot

    Hi I am producing a normal distribution probability plot, and I have a few questions related to confidence interval. An example of the plot I...

    Started by jlbriggs‎, 02-06-2013 01:23 PM
    confidence interval, normal probability plot
    • Replies: 0
    • Views: 3,605
    02-06-2013, 01:23 PM Go to last post
  54. Statistical tests for a usability survey with a likert scale?

    Statistical newbie here. I am trying to understand what statistical tests can be/should be ran for survey information on the ease of use of a web...

    Started by pinkswansays‎, 02-06-2013 11:32 AM
    • Replies: 2
    • Views: 3,024
    02-06-2013, 12:52 PM Go to last post
  55. on the use of SD , SE or confidence interval.

    Dear All I have a difficult data set from my experiments that needs to be shown properly and described taking into account the statistics. Time ...

    Started by rom9‎, 02-06-2013 11:20 AM
    • Replies: 1
    • Views: 1,677
    02-06-2013, 12:22 PM Go to last post
  56. comparing score? wilcoxon signed rank test

    hey guys a little bit of question from me about test used for comparing score my data is normally distribute but i use Wilcoxon to compare...

    Started by Andy_G‎, 02-06-2013 04:08 AM
    • Replies: 2
    • Views: 1,319
    02-06-2013, 11:44 AM Go to last post
  57. Normal distribution theoretical moments

    how we can show that the follwoing equility holds E=0 E=0 E=0 E=0

    Started by ujgilani‎, 02-06-2013 08:45 AM
    normal distribution, statisics
    • Replies: 3
    • Views: 1,548
    02-06-2013, 10:21 AM Go to last post
  58. Co-efficient of variation to eliminate frequency bias in vector

    0 down vote favorite I need to determine the significance of a certain variable (i.e. cue) that co-occurs with an element of a particular...

    Started by lala1429‎, 02-06-2013 09:32 AM
    co-efficient of variation, significance
    • Replies: 0
    • Views: 859
    02-06-2013, 09:32 AM Go to last post
  59. Product A vs. Product B: How many visits to my website do I need?

    Let's say I have a website and I wanted to see if I could promote certain products through advertising on Google. On a given day, Product A...

    Started by ABCD‎, 02-05-2013 08:15 PM
    • Replies: 1
    • Views: 1,362
    02-06-2013, 07:46 AM Go to last post
  60. Daily samples of a measure- how much variance is there for each participant?

    Hi guys, I have a set of data where someone has collected a measure of performance on a motor task every day from the same participants (N=9) for...

    Started by Sunwin‎, 02-06-2013 05:45 AM
    repeated tests, test re-test
    • Replies: 0
    • Views: 1,060
    02-06-2013, 05:45 AM Go to last post

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