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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: 196,855
    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: 66,810
    09-30-2005, 09:44 AM Go to last post
  1. Survey Findings How to Use - help

    I have a dataset of items which use items from the GSS. My sample (N=300) was randomly drawn from 2000 respondents. They are a special population of...

    Started by DMCH‎, 06-08-2013 02:38 PM
    • Replies: 0
    • Views: 1,099
    06-08-2013, 02:38 PM Go to last post
  2. auto-regressive and polynomial models

    Hi, I am not a statistician and I want to use the pure auto-regressive (AR) model and/or the polynomial model to solve a prediction problem. I...

    Started by nahla‎, 06-08-2013 08:41 AM
    • Replies: 0
    • Views: 779
    06-08-2013, 08:41 AM Go to last post
  3. Exclamation Finding P-value...confusing

    The target length for a component is set at 30mm. A random sample of 25 components is selected and the lengths of each are recorded. The result is...

    Started by Hema‎, 06-08-2013 04:59 AM
    • Replies: 1
    • Views: 997
    06-08-2013, 08:10 AM Go to last post
  4. [non normal Multiple sample comparison] analysis and error bars for medians

    Dear all, Background: Treatment applied to 10 groups of different sizes. Each group treated with a different concentration. Groups 9 and 10 are...

    Started by mirror‎, 06-07-2013 07:15 AM
    • Replies: 0
    • Views: 1,258
    06-07-2013, 07:15 AM Go to last post
  5. Standard error calculation fails

    Hello all. I would really appreciate any help in solving this problem: There is an interesting article on funnel plots on the web:...

    Started by DrBorrow‎, 06-07-2013 05:28 AM
    standard error
    • Replies: 0
    • Views: 1,528
    06-07-2013, 05:28 AM Go to last post
  6. -->(BOX-COX) Transformation breaks down for large (positive) coefficient values <--

    Hi, I have done a box-cox transformation of my response variable, using the following formula: (Y^lambda - 1)/lambda Previously, I have got some...

    Started by hanke83‎, 06-07-2013 04:05 AM
    box-cox, sas proc_transreg, transformation
    • Replies: 0
    • Views: 1,392
    06-07-2013, 04:05 AM Go to last post
  7. One-Way ANOVA, Nonverbal Displays Affect Neuroendocrine Levels

    Hi, So im doing a critique review on this paper: Power Posing: Brief Nonverbal Displays Affect Neuroendocrine Levels and Risk Tolerance by Dana...

    Started by arj002‎, 06-06-2013 02:37 AM
    • Replies: 5
    • Views: 1,884
    06-07-2013, 03:27 AM Go to last post
  8. Relationships between quantitative and categorical variables

    Hello I need your help to find a methodology to analyze some data that I have collected for my research. I will explain how I collected my...

    Started by mbatouk‎, 06-07-2013 03:08 AM
    • Replies: 0
    • Views: 1,218
    06-07-2013, 03:08 AM Go to last post
  9. Broken Line Regression

    X = Lot & Y = Cost Give a broken line linear model with a breakpoint at 250: Y = B0 + B1X1 + B2X2 + B3X3 + e where X2 = 0 or 1 depending on...

    Started by simplemts‎, 06-06-2013 09:57 PM
    • Replies: 2
    • Views: 1,969
    06-06-2013, 10:30 PM Go to last post
  10. Problem with estimate.

    Hello, I have practiced on an exam problem, and in the problem they chose to estimate a paramter a way that I did not like. We have to joint...

    Started by Samwell‎, 06-06-2013 06:02 PM
    • Replies: 0
    • Views: 799
    06-06-2013, 06:02 PM Go to last post
  11. Question about One-Way Anova assignment

    ANOVA Sum of Squares df Mean Square F Sig. A Between Groups 1.140 2 .570 .262 .770 Within...

    Started by Russ369‎, 06-06-2013 12:20 AM
    • Replies: 3
    • Views: 1,359
    06-06-2013, 11:14 AM Go to last post
  12. building confidence interval for a simulated estimate

    Hi, the context : I'm using a basic logistic regression model on my data, and the values of interest are the basic estimates : Beta regression...

    Started by Alex C‎, 06-03-2013 02:07 PM
    2 Pages
    1 2
    • Replies: 20
    • Views: 3,923
    06-06-2013, 10:46 AM Go to last post
  13. confidence interval for mean difference vs. hypothesis testing

    Hello, I am trying to solve a simple question in hypothesis testing and confidence interval, and something doesn't seem right. I have an...

    Started by Yankel‎, 06-05-2013 12:08 PM
    • Replies: 6
    • Views: 2,198
    06-06-2013, 09:32 AM Go to last post
  14. Basic question about variance

    Hi! First time poster, hello all! My question is as follows: a symmetrical dice is tossed ten times. What is the expected value and variance? ...

    Started by Leso‎, 06-06-2013 02:29 AM
    • Replies: 4
    • Views: 1,653
    06-06-2013, 08:21 AM Go to last post
  15. Calculating a sample size and upper and lower confidence intervals

    Good evening, My goal is to develop a testing strategy for the shell strength of eggs for retail sale in egg cartons. Currently we use a grading...

    Started by DumbEggFarmer‎, 06-06-2013 06:28 AM
    • Replies: 0
    • Views: 2,313
    06-06-2013, 06:28 AM Go to last post
  16. 2 way anova

    Dear SPSS thinkers, I have a case with one dependent variable ( image of a product) and two independent variables, gender and age. My problem lies...

    Started by SPSSpraepi‎, 06-06-2013 05:01 AM
    2 way anova
    • Replies: 0
    • Views: 1,336
    06-06-2013, 05:01 AM Go to last post
  17. Question

    Hello everyone. I am working on the following problem for my stat class: Assume that when victims are asked how well their needs were met by the...

    Started by aroraaj‎, 06-05-2013 09:39 PM
    z-statistic
    • Replies: 0
    • Views: 1,469
    06-05-2013, 09:39 PM Go to last post
  18. Random sampling - field research in Bihar, India

    Dear all, I am currently doing some research in India for my studies and have question relating to sampling? I need to interview people in those...

    Started by jknemo‎, 06-05-2013 07:48 PM
    interview, random sampling
    • Replies: 0
    • Views: 1,197
    06-05-2013, 07:48 PM Go to last post
  19. Unhappy Meshing research questions and stats for descriptive research

    Hi, I'm doing research on students' views on the nature of science. I'm using a descriptive research design. I am comparing students views based on...

    Started by lethalstat‎, 06-05-2013 06:09 PM
    • Replies: 0
    • Views: 1,130
    06-05-2013, 06:09 PM Go to last post
  20. pre n post, longitudinal

    Hello! We are going to measure (interval scale) levels of skills and knowledge before, under, and after an educational/pedagogical project....

    Started by Loffy‎, 06-20-2012 02:16 AM
    • Replies: 1
    • Views: 926
    06-05-2013, 03:28 PM Go to last post
  21. Correlation not reflecting actual similarity of values

    Hello, I have 2 vector of data which correspond to rating in a test. Subjects perform the test and rate their result (from 0 to 10) and the next...

    Started by colores_klein‎, 06-05-2013 05:42 AM
    correlation, intraclass, vas
    • Replies: 3
    • Views: 1,431
    06-05-2013, 11:17 AM Go to last post
  22. Analyzing Differenced Data

    Hello, I have a lake and we're looking at the changes each year in the amount of liquid in the lake (so freezing, melting, etc). I am performing...

    Started by belletire89‎, 06-05-2013 09:43 AM
    changepoint, differenced data
    • Replies: 0
    • Views: 834
    06-05-2013, 09:43 AM Go to last post
  23. Multiple regression and logrithmic transformed model

    Hi How do i expand this cost function 3,629905+1,647x including INCOME, LABOUR, PHYSICAL and FUNDS (the cost function made only includes INCOME)?...

    Started by Alaababz‎, 06-05-2013 08:03 AM
    • Replies: 0
    • Views: 972
    06-05-2013, 08:03 AM Go to last post
  24. Question Crises: ANOVA? How to analyse non-normal, non-Homogeneity data with different N group

    Dear all, I'm somewhat new the world of statistics, or at least it has been years since I last used it and basically the only program I know...

    Started by Arasazi‎, 06-05-2013 03:57 AM
    anova, control variables, homogeneity, normal-distribution, regresion analysis
    • Replies: 0
    • Views: 1,268
    06-05-2013, 03:57 AM Go to last post
  25. Need help choosing an appropriate test.

    I have two sets of frequencies, observed and expected. I know I could do a Chi-squared test to determine if the frequency distributions match, but...

    Started by AlexG‎, 06-04-2013 10:49 AM
    • Replies: 3
    • Views: 1,067
    06-04-2013, 05:20 PM Go to last post
  26. Red face Quasi-experimental design ignorance

    Hi guys. I'm an idiot. Please help me. :-( I want to compare success rates of different interventions on two variables in multiple non-random...

    Started by Sianmi‎, 06-04-2013 04:42 AM
    quasi exper
    • Replies: 7
    • Views: 1,947
    06-04-2013, 11:18 AM Go to last post
  27. Smile Anova? Manova? multiple T-tests? (newbie question warning)

    Hello all I have study data to analyze, and my normal stats guru is out of town. The study (some facts altered to protect the innocent) goes...

    Started by Voice Nerd‎, 05-24-2013 07:52 PM
    correlation analysis, newbie, study design, variance
    • Replies: 2
    • Views: 1,652
    06-04-2013, 04:49 AM Go to last post
  28. Percentages - simple question

    Hello I got confused and need help with a primary school problem... If I have a measurement of some variable, for example 25, and then I take...

    Started by Yankel‎, 06-04-2013 03:44 AM
    • Replies: 1
    • Views: 1,208
    06-04-2013, 04:18 AM Go to last post
  29. Is a Cox regression the right test for my question?

    I would like to test if the value of a blood parameter is linked to death (age as a covariate)....example: higher serum creatinine = higher risk to...

    Started by denise2910‎, 06-03-2013 04:32 PM
    cox regression, medicine
    • Replies: 0
    • Views: 1,255
    06-03-2013, 04:32 PM Go to last post
  30. Normally distributed RVs

    Hello. I'd like to know how can I calculate the probability that normally distributed random variables locate on the surface area on a cylinder? I...

    Started by Ferra‎, 05-31-2013 12:13 PM
    cylinder, normal distribution
    • Replies: 7
    • Views: 1,393
    06-03-2013, 01:04 PM Go to last post
  31. Post Weibull Distribution Problem Help (Theoretical and Matlab)

    Consider a Weibull distribution with the following pdf: f(x)= (Ɵ2/ Ɵ1)*(x/ Ɵ1)^( Ɵ2-1)*exp{-( x/ Ɵ1)^ Ɵ2} For x>0, Ɵ1>0, Ɵ2>0 (a) if now Y=( x/...

    Started by ajmal1075‎, 04-16-2013 11:41 PM
    • Replies: 5
    • Views: 4,883
    06-03-2013, 05:00 AM Go to last post
  32. Determining the sampling distribution

    I have been presented with the following question:

    Started by hypochondriac‎, 06-02-2013 07:15 PM
    • Replies: 0
    • Views: 1,405
    06-02-2013, 07:15 PM Go to last post
  33. Unpaired, dependent data comparison, or comparison of paired means

    Hi I'm trying to find a statistical test that can help me compare the means of two dependent groups. My data: 1: parameter values from white...

    Started by nannamp‎, 06-02-2013 12:00 PM
    dependent observations, paired means, unpaired data
    • Replies: 1
    • Views: 2,782
    06-02-2013, 06:33 PM Go to last post
  34. importing csv files into R

    Hi I keep trying to import a csv file into R but keep getting the error "S", please can anyone tell me what I am doing wrong

    Started by niyinks‎, 11-28-2010 07:34 AM
    • Replies: 14
    • Views: 12,386
    06-02-2013, 05:16 PM Go to last post
  35. Looking For A Name For This Process

    Hi there. Is there a name for the statistic function of taking a group of numbers -> removing the highest and lowest -> then selecting the number...

    Started by SparkyCanada‎, 06-01-2013 09:24 PM
    • Replies: 4
    • Views: 1,286
    06-01-2013, 10:22 PM Go to last post
  36. Recommended strategy when related data sets have different properties?

    I have 4 pairs of data sets; each data set consists of 10 values (so, 20 values per pair), and I need to compare each pair of value sets against each...

    Started by statsSeeker‎, 05-30-2013 08:53 PM
    • Replies: 4
    • Views: 1,322
    06-01-2013, 05:30 PM Go to last post
  37. Calculating averages of SD values. Why is it wrong?

    Why can't SD be averaged? I have calculated the SD of a continuous variable within a group of people, as a measure of variability for that variable....

    Started by nchapinal‎, 05-31-2013 07:03 PM
    • Replies: 4
    • Views: 1,426
    06-01-2013, 04:34 PM Go to last post
  38. Question Two-way ANOVA to detect difference in activity at different temperatures?

    I need to answer the question of whether three species differ in their activity pattern according to soil temperature. Activity pattern is measured...

    Started by slomascolo‎, 06-01-2013 02:44 PM
    activity pattern, two way anova
    • Replies: 0
    • Views: 1,164
    06-01-2013, 02:44 PM Go to last post
  39. Conditional Variance and Expectation in a Binomail Mixture Model

    This is a homework question. Any hints would be much appreciated. The question asks what the estimates of E(Y) and Var(Y) are based on the...

    Started by Tavin‎, 06-01-2013 07:05 AM
    • Replies: 2
    • Views: 878
    06-01-2013, 08:35 AM Go to last post
  40. Loco-regional recurrence free survival longer than overall survival...

    If the loco-regional recurrence free survival is longer than the overall survival, is it right to interpret as most patients died from distant...

    Started by kwanhoon‎, 05-31-2013 06:37 AM
    • Replies: 0
    • Views: 1,255
    05-31-2013, 06:37 AM Go to last post
  41. Which test should be used for relationships between two groups in 2D-distributions?

    Hi, I am a biologist and try to test if there is a relationship between two types of cells in tissues of my interest. I obtained microscopic...

    Started by ykang‎, 05-29-2013 05:28 PM
    • Replies: 5
    • Views: 1,497
    05-31-2013, 02:08 AM Go to last post
  42. Calculating margin of error

    Hi, I carried out a survey of a small population (70 people) and obtained 36 completed questionnaires, representing a response rate of just over...

    Started by Counting‎, 05-28-2013 07:45 AM
    margin of error
    • Replies: 2
    • Views: 780
    05-30-2013, 10:56 AM Go to last post
  43. Family Wise Error, Help determining family size...

    Hello, I am currently performing odds ratios (with chi squares) on the following table: Eyes Ears Nasal Oral Respiratory Trauma Gender Age...

    Started by Wolphren‎, 05-21-2013 07:11 AM
    family wise error
    • Replies: 3
    • Views: 1,938
    05-30-2013, 09:58 AM Go to last post
  44. Question for Stratify sampling

    I am trying to understand the sampling from the following description. Does anyone know how they get the sample stratum sizes: 10,5,10,4,6. Thanks a...

    Started by peter663‎, 05-30-2013 08:27 AM
    • Replies: 0
    • Views: 1,098
    05-30-2013, 08:27 AM Go to last post
  45. The best methodology for an employee survey?

    Hi, I'm looking at an Employee Engagement Survey... - The survey has a total of 49 questions in it. - All responses are on a 5 point likert...

    Started by cjcass‎, 05-29-2013 06:49 AM
    • Replies: 2
    • Views: 1,558
    05-30-2013, 07:24 AM Go to last post
  46. Out-of-bound corrected correlation. What should we do?

    When you get correlations corrected for artifacts (e.g., unreliability or more broadly, such as those listed in that online book) higher than 1. What...

    Started by Donald‎, 05-30-2013 12:22 AM
    • Replies: 0
    • Views: 1,127
    05-30-2013, 12:22 AM Go to last post
  47. Calculating my percentile score - it just seems too high!

    I recently completed an exam and received my scores. I wanted to find out my percentile. I got a total of 317.5 out of a total score of 500. I...

    Started by supernaut76‎, 05-19-2013 01:15 AM
    rescale
    • Replies: 14
    • Views: 1,983
    05-29-2013, 01:39 PM Go to last post
  48. Apparent contradiction in Mann-Whitney-Wilcoxon test results

    I have 2 data sets, each N=10, that I would like to compare. They fail Levene's test for homogeneity of variances, and for this reason, I can't use...

    Started by statsSeeker‎, 05-28-2013 09:39 PM
    mann-whitney test, mann-whitney u
    • Replies: 5
    • Views: 1,605
    05-29-2013, 11:01 AM Go to last post
  49. Variance of combined and weighted data sets

    Hello all! The basics of my problem are as follows. I survey 1000 non-hispanics and 1000 hispanics and ask them whether they bought a power drill...

    Started by potterbro‎, 05-29-2013 09:11 AM
    • Replies: 0
    • Views: 2,039
    05-29-2013, 09:11 AM Go to last post
  50. Problem calculating element-wise percent change

    I have 2 data sets that I'm attempting to compare to each other, using a percent change calculation. I have data collected for a physiological model...

    Started by statsSeeker‎, 05-28-2013 07:48 PM
    percentage change
    • Replies: 0
    • Views: 1,770
    05-28-2013, 07:48 PM Go to last post
  51. chi square test for binary valued data

    Hi all, I am trying to implement an algorithm using a programming environment. What I am asking is how can use chi square test for binary type...

    Started by genclik27‎, 05-03-2013 07:52 AM
    • Replies: 12
    • Views: 4,830
    05-28-2013, 05:49 PM Go to last post
  52. Stepwise Multiple Regression - Case:IV Ratio?

    Hi, Having researched stepwise regression there is a clear view that you need to target a Case:IV Ratio of at least 40:1 as "stepwise doesn't...

    Started by cjcass‎, 05-28-2013 09:40 AM
    many explanatory, stepwise
    • Replies: 4
    • Views: 1,707
    05-28-2013, 02:55 PM Go to last post
  53. gamma-function

    gamma-function g(t) = ymax * t^(alpha) * exp( alpha * (1-t)) With known ymax and alpha, what is the maximum slope of g(t) (with t>0)?

    Started by pongtep‎, 05-22-2013 12:04 AM
    2 Pages
    1 2
    gamma function
    • Replies: 23
    • Views: 4,190
    05-28-2013, 02:20 PM Go to last post
  54. Compare std deviation to know which dataset has more data points closer to mean?

    Hi I have two datasets each with different mean and standard deviation (std). We know that, std is a measure of the dispersion of the numbers from...

    Started by zqzuk‎, 05-26-2013 06:25 PM
    • Replies: 2
    • Views: 1,240
    05-28-2013, 11:41 AM Go to last post
  55. Uncertainty of the sample mean

    I am sampling an unknown distribution (see attachment for a histogram of 10000 samples) and calculating the sample mean _bar. Now I would like to...

    Started by Tax‎, 05-24-2013 09:53 AM
    • Replies: 3
    • Views: 4,421
    05-28-2013, 11:32 AM Go to last post
  56. model comparison, log likelihood score, P value.

    I am working on Bioinformatic analysis of genomic data. I am doing some statistical analysis and doing model comparison and have some conceptual...

    Started by bagdevi‎, 05-27-2013 04:49 AM
    log likelihood score, model comparison, p value
    • Replies: 3
    • Views: 3,446
    05-28-2013, 08:10 AM Go to last post
  57. Grouping multiple survey question to obtain 1 Mean & Std. Dev.

    Hi, I am currently doing an academic research and I would like some advice on the following issue. The research is about age & gender...

    Started by makkumakku‎, 05-28-2013 08:08 AM
    customer satisfaction
    • Replies: 0
    • Views: 1,517
    05-28-2013, 08:08 AM Go to last post
  58. Question interpreting and commenting on Repeated-Measures ANOVA results

    Hello, everybody, you've always been really helpful, so I've got a question to you, again :) I am dealing with an assignment, where we have to...

    Started by invisibleme‎, 05-28-2013 06:43 AM
    anova, repeated measure anova, reporting results
    • Replies: 0
    • Views: 1,240
    05-28-2013, 06:43 AM Go to last post
  59. What Test to Use to Compare Groups

    I'm looking through some data that I have collected from my patients over the past year and wanted to know what Statistical Test to use to see if a...

    Started by nmverma‎, 05-27-2013 08:01 PM
    equivalence testing, test of significance
    • Replies: 10
    • Views: 1,688
    05-28-2013, 03:35 AM Go to last post
  60. Stats homework Help

    Hey Guys I kind of need help with these questions:) would really appreciate it:) 1.)When the assumption of sphericity is violated, correction...

    Started by kavi‎, 05-28-2013 01:59 AM
    homework
    • Replies: 2
    • Views: 1,733
    05-28-2013, 02:37 AM Go to last post

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