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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: 197,111
    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: 66,929
    09-30-2005, 09:44 AM Go to last post
  1. testing a null hypothesis that is a range

    My text shows how to do hypothesis testing given a significance level and a null hypothesis, but on my assignment I'm required to test a null...

    Started by kingsolomonsgrave‎, 09-30-2013 06:18 PM
    • Replies: 3
    • Views: 2,651
    10-01-2013, 02:01 PM Go to last post
  2. Expected value (mean)

    Hi All I'm looking for a metric that shows a close trend (good correlation) to the mean (expected value) of a distribution, so I can investigate...

    Started by Ferra‎, 10-01-2013 10:12 AM
    expected value
    • Replies: 6
    • Views: 1,437
    10-01-2013, 10:53 AM Go to last post
  3. Question Standard Deviation of Half distribution

    Hi, Recently I heard about calculating Standard Deviation of the upper half of a distribution which raised my eyebrows. Is this really...

    Started by nature‎, 10-01-2013 05:02 AM
    • Replies: 1
    • Views: 3,035
    10-01-2013, 06:45 AM Go to last post
  4. Question Hypothesis Testing

    You arrive late at a race track; the cars are already hurtling past you. You know from past experience that the cars are numbered (and labeled) 1,...

    Started by v-moda‎, 10-01-2013 05:45 AM
    hypothesis testing, type error, z scores
    • Replies: 0
    • Views: 1,093
    10-01-2013, 05:45 AM Go to last post
  5. Question Coin flipping

    Alan, Bob, and Charlie agreed that the “odd man” (the person whose outcome is different from others) would buy the coffee. After simultaneously...

    Started by v-moda‎, 10-01-2013 05:23 AM
    coin, coin toss probability
    • Replies: 0
    • Views: 1,012
    10-01-2013, 05:23 AM Go to last post
  6. test for ratios

    Hi. I'm conducting a research concerning forecasting exchange rates. I compare several models, currencies and time horizons. All models are compared...

    Started by smolik‎, 09-15-2013 02:46 AM
    • Replies: 1
    • Views: 2,333
    09-30-2013, 08:56 AM Go to last post
  7. Can you give me some references?

    I need the derivation of the parameters of distributions including: Gumbel, Weibal, Lognormal and Gamma with both method of moments and maximum...

    Started by Fred_a‎, 09-29-2013 07:48 PM
    distibution, mle, moments
    • Replies: 1
    • Views: 1,221
    09-30-2013, 08:52 AM Go to last post
  8. How to interpret and compare models in Cox regression?

    Hallo, I am trying to interpret the results of a Cox regression; I am doing a PhD in medicine. I love statistics but my question is still pretty...

    Started by lucavalery‎, 09-30-2013 07:13 AM
    cox regression, interpreting results, likelihood ratio, log likelihood score, survival analysis
    • Replies: 0
    • Views: 1,707
    09-30-2013, 07:13 AM Go to last post
  9. Address whether one overlap is significantly bigger that of another related overlap

    I could really use a hit as to which statistical test I need to use to address the following problem: I have three different species: A, B and C....

    Started by pkd188‎, 09-30-2013 06:25 AM
    chi square, fisher's exact test, overlap
    • Replies: 0
    • Views: 1,701
    09-30-2013, 06:25 AM Go to last post
  10. Percentage Points

    Hello all I wanted to ask you something about percentages. I have a variable X, which is the change of some measure in %. I have calculated X's...

    Started by Yankel‎, 09-30-2013 01:49 AM
    • Replies: 0
    • Views: 1,441
    09-30-2013, 01:49 AM Go to last post
  11. Question Finding value representing the indicated percentiles help!

    Hi, I am having some issues solving this problem involving stock prices for indicated percentiles. Use the following set of stock prices (in...

    Started by Izzy‎, 09-29-2013 11:07 PM
    indicated percentiles, percentiles, urgent
    • Replies: 0
    • Views: 1,856
    09-29-2013, 11:07 PM Go to last post
  12. Ambiguous question in homework...

    Hi All, I just wanted to probe this board before I went to the TA, as class just started and I don't want to be *that* guy. Anyway, I have an...

    Started by FratBernie‎, 09-28-2013 04:43 PM
    ols, regression, residuals, variance
    • Replies: 0
    • Views: 1,976
    09-28-2013, 04:43 PM Go to last post
  13. Descriptive Statstics Question!!

    Hey guys, I need your help: I got following question: Six customers have Tested a new chocolate bar an have rated it on 0-10 scale...

    Started by franklin4444‎, 09-28-2013 10:03 AM
    descriptive statistics, means, question, stats
    • Replies: 0
    • Views: 988
    09-28-2013, 10:03 AM Go to last post
  14. Effect Sizes question

    Hi all, I have two different samples, and need to know if there are differences in the means. Sample 1 has 46 people in it. It has a Mean of...

    Started by Torto‎, 09-27-2013 12:24 PM
    • Replies: 5
    • Views: 1,784
    09-27-2013, 03:23 PM Go to last post
  15. Questions about Contrasts in a 3-way ANOVA related to error terms and t-tests

    A friend and I are trying to determine the most appropriate way to analyze some data that we have. Our Design is a 2x2x2 between Subjects design,...

    Started by dham‎, 09-27-2013 01:57 PM
    • Replies: 0
    • Views: 1,088
    09-27-2013, 01:57 PM Go to last post
  16. Use of moderating variable in hypothesized model

    i have constructed a hypothesized model in which two independent variables; these are 1.potential 2. future prosepects. Independent variable i-e...

    Started by Muhammad‎, 09-27-2013 12:30 PM
    • Replies: 1
    • Views: 1,090
    09-27-2013, 01:25 PM Go to last post
  17. Sample mean: bias and variance

    I am having a bit of difficulty with the following questions: My attempts at answering the problems: 1. I believe that this process could...

    Started by ishihara‎, 09-27-2013 10:50 AM
    • Replies: 0
    • Views: 1,106
    09-27-2013, 10:50 AM Go to last post
  18. Population size question

    Let me first say I am not well versed in statistics, but I cannot seem to find the asnwer to my question by doing a Google Search (perhaps I am not...

    Started by mspringer1973‎, 09-26-2013 10:38 AM
    • Replies: 2
    • Views: 1,234
    09-26-2013, 07:11 PM Go to last post
  19. Concept of P value

    Hi Guys Recently I started working towards improving my understanding of basic concepts of statistics and have read a few posts/books online about...

    Started by excelmac‎, 09-21-2013 09:59 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 7,055
    09-26-2013, 06:51 PM Go to last post
  20. Is ANCOVA being used correctly?

    Hi! I am having a serious horrible time with an ANCOVA issue, and I would be immensely grateful for any help. I am writing an evaluation of a...

    Started by mithrauko‎, 09-26-2013 01:27 PM
    • Replies: 1
    • Views: 1,306
    09-26-2013, 02:06 PM Go to last post
  21. Confidence intervals for difference between Poisson rates

    Hi, My data consists of occurrences of words in time windows. E.g.: Day; Word; Frequency 1; "dog"; 45 1; "cat"; 2 ... 2; "dog"; 90 2; "cat";...

    Started by pengcafe‎, 09-26-2013 10:10 AM
    confidence interval, count data, poisson, rate
    • Replies: 0
    • Views: 1,207
    09-26-2013, 10:10 AM Go to last post
  22. Log-rank or Wilcoxon test

    I want to compare two survival curves (cumulative) and I’m not completely sure which of the two tests is most appropriated log-rank or wilcoxon test....

    Started by Aleco‎, 09-25-2013 10:24 PM
    • Replies: 2
    • Views: 2,285
    09-26-2013, 07:58 AM Go to last post
  23. Exclamation Normal Distribution

    I cant figure out how to do this problem: I have 2 sets of means and 2 sets of SD 1sth graders scored a mean of 25 and a sd of 5 5th graders...

    Started by sceater‎, 09-25-2013 01:47 PM
    distribution, means, normal distribution, z-score
    • Replies: 10
    • Views: 1,534
    09-25-2013, 03:23 PM Go to last post
  24. Quick Tips?

    If my Hypothesis is Mean BMI is equal for all three teams... What test should i use? 1 way ANOVA? What test can i perform to determine which...

    Started by saffy‎, 09-25-2013 01:22 PM
    • Replies: 0
    • Views: 1,255
    09-25-2013, 01:22 PM Go to last post
  25. What is the correct test for significance?

    I am looking at data from the same survey administered to two different and unequal samples in 2009 and 2012. The survey was a community needs...

    Started by 6d6n6a‎, 09-24-2013 02:31 PM
    • Replies: 5
    • Views: 2,095
    09-25-2013, 01:00 PM Go to last post
  26. comparing groups and the significance of two outcomes in each group

    Hi, It's been 10 years since I picked up a stats book and wondering what's the best tool for the job. Given 2 systems, 3 categories in each...

    Started by touringkg‎, 09-21-2013 07:56 AM
    • Replies: 1
    • Views: 1,366
    09-25-2013, 12:30 PM Go to last post
  27. Presenting the results: Continuous variables, Normally distributed vs non normally

    Hi :) My question is most probably simple but I can't find an answer to it. According to my stats textbook one should report continuous...

    Started by Elha‎, 09-23-2013 08:59 PM
    • Replies: 2
    • Views: 4,193
    09-25-2013, 10:19 AM Go to last post
  28. Missing Data - Comparing Methods

    Firstly, I hope I make sense... I am working on an assignment that involves comparing different methods of dealing with missing data (e.g. EM, mean...

    Started by insertusernamehere‎, 09-25-2013 05:27 AM
    • Replies: 0
    • Views: 1,028
    09-25-2013, 05:27 AM Go to last post
  29. Improved Monte-Carlo method vs. hit-and-miss method

    I am not understanding *Which is more accurate, the hit-and-miss method or the improved Monte-Carlo method?* ...

    Started by Cynderella‎, 09-25-2013 03:17 AM
    integration, monte carlo, monte-carlo, simulation, variance
    • Replies: 0
    • Views: 2,838
    09-25-2013, 03:17 AM Go to last post
  30. resources for learning how to work with expectation

    I'm doing a course in econometrics I have to do lots of expectations, but I have never been taught how to do them. Is there a resource that...

    Started by kingsolomonsgrave‎, 09-24-2013 01:26 PM
    • Replies: 3
    • Views: 1,283
    09-24-2013, 06:37 PM Go to last post
  31. Help with Volatility and Standard deviation predictions for football stats

    I really have just trying to create a excel to help me with my fantasy football. I would love to talk with a mathematician on skype for a few mins to...

    Started by cctravis‎, 09-24-2013 03:47 PM
    • Replies: 0
    • Views: 1,026
    09-24-2013, 03:47 PM Go to last post
  32. Correlational statistics such as pearson product moment and regression analysis

    Reading through previous threads I fear my question will sound very basic in comparison! I am currently researching the appropriate statistical tools...

    Started by emmalou@mmu‎, 09-24-2013 02:48 PM
    analysis, correlation, statistics
    • Replies: 1
    • Views: 1,055
    09-24-2013, 03:03 PM Go to last post
  33. Factor Analysis

    Hello! I run a Factor Analysis and got 14 factors with an Eigenvalue above 1! The first 5 factors explain most of the variance (Eigenvalue >2)...

    Started by Astero‎, 09-24-2013 10:56 AM
    eigenvalue, factor, factor analysis, variance components
    • Replies: 2
    • Views: 1,410
    09-24-2013, 12:24 PM Go to last post
  34. Unhappy Histogram help

    Hi, I have an exam in two days and I need help with these 3 problems. I know the answers but I don't know they got them. Can you please explain to me...

    Started by lala1120‎, 09-24-2013 10:20 AM
    • Replies: 0
    • Views: 984
    09-24-2013, 10:20 AM Go to last post
  35. Bivariate normal distribution

    Hi guys, I am really a layman in statistics. Recently I have the problem related to the bivariate normal distribution. Assume that I have the...

    Started by Zarabb‎, 09-23-2013 06:44 PM
    • Replies: 0
    • Views: 1,314
    09-23-2013, 06:44 PM Go to last post
  36. ancova

    Hello, I have a set of data (Xi,Yi) to which I fit a curve: Y=a*X^b, I use matlab to determine a and b. I also have a model equation: Y=a0*X^b0....

    Started by Aloulou‎, 09-23-2013 05:41 PM
    • Replies: 0
    • Views: 1,129
    09-23-2013, 05:41 PM Go to last post
  37. Congruential Generators.

    Find all of the cycles of the following congruential generators. For each cycle identify which seeds X_0 lead to that cycle. (a). X_{n+1} = 9X_n +...

    Started by Cynderella‎, 09-23-2013 06:51 AM
    r-programming, simualtion
    • Replies: 1
    • Views: 1,093
    09-23-2013, 08:17 AM Go to last post
  38. Rejection sampling

    Dear all, I have a list of 1470 numbers that have certain density distribution (attached file). I also have a list of ~ 52000 numbers from...

    Started by statQuery‎, 09-23-2013 07:54 AM
    • Replies: 0
    • Views: 988
    09-23-2013, 07:54 AM Go to last post
  39. PLEASE HELP!Proper analysis for pre/posttests of two treatment groups and one control

    I am interested in conducting a quasi-experimental study, due to the lack of true randomization in selecting the control and treatment groups. School...

    Started by MarkAllen‎, 09-22-2013 02:57 PM
    • Replies: 3
    • Views: 1,496
    09-23-2013, 07:53 AM Go to last post
  40. Violation of Normality Assumption in Mixed Design ANOVA

    I conducted a study in which two groups of teachers (pre-service and veteran) all watched four video clips of instances of aggression between...

    Started by leh2686‎, 09-22-2013 09:51 PM
    anova, mixed design, normality, repeated measures
    • Replies: 0
    • Views: 1,774
    09-22-2013, 09:51 PM Go to last post
  41. Z score

    Hi guys I need help with this question: Past data indicates an 80% success rate in treating a certain medical problem. A new treatment is used on 100...

    Started by Beef‎, 09-21-2013 01:45 AM
    • Replies: 1
    • Views: 2,166
    09-21-2013, 09:22 AM Go to last post
  42. Covariance matrix - understanding the meaning

    Hey guys. Please consider the covariance matrix M = . Now consider a gaussian 3 dimensional plot: z = C1 * e^(-C2 * M * t) = C1 * e^(-C2 * ) ...

    Started by Phoeniyx‎, 09-20-2013 09:33 AM
    • Replies: 1
    • Views: 1,895
    09-20-2013, 11:44 AM Go to last post
  43. fit a histogram

    Say we have a vector data<-c(5,2,46,49,10,68,65,34,75,60,57,18,45,5,1,4,28) hist(data) We want to fit the histogram with a normal distr....

    Started by ole‎, 09-20-2013 01:31 AM
    • Replies: 3
    • Views: 1,297
    09-20-2013, 09:24 AM Go to last post
  44. Generating Random Investment Returns assuming a Student's T Distribution

    Hi there I'm new to Talk Stats so forgive me if I'm doing something wrong. I need some help in building a random number generator in excel...

    Started by Swarbs‎, 09-20-2013 06:14 AM
    • Replies: 1
    • Views: 1,564
    09-20-2013, 07:14 AM Go to last post
  45. Goodness-of-Fit or Test-of-Independence

    Newbie here, but this question is driving me nutty because the SPSS manual shows these two as different test. I'm just trying to compare the group...

    Started by Uncle_Ray‎, 09-20-2013 02:25 AM
    • Replies: 0
    • Views: 1,197
    09-20-2013, 02:25 AM Go to last post
  46. Question on methodology concerning categorical variables with repeated measures

    Hello, I have a dataset which includes the following data: It contains information on how frequent specific medications have been prescribed over...

    Started by Eldude‎, 09-19-2013 04:06 PM
    • Replies: 2
    • Views: 1,517
    09-19-2013, 11:43 PM Go to last post
  47. Red face Higher or Lower Powered studies???

    Trying to get me head around if a statistically significant result p<0.05 from a low powered study (20% power for a true relationship in a research...

    Started by Gisele‎, 09-17-2013 07:02 PM
    • Replies: 10
    • Views: 2,077
    09-19-2013, 08:01 PM Go to last post
  48. Is weighted average the best?

    Hi Stats for absolute beginners! I have four different gradients on a piece of land of 1,000 square yards. 50% is a 1% gradient 20% is a 2%...

    Started by brisbanebob‎, 09-19-2013 04:48 PM
    • Replies: 1
    • Views: 1,062
    09-19-2013, 06:21 PM Go to last post
  49. Dose-response meta analysis

    my professor gave data set of 3 studies investing the effect of a serum concentration of a drug on the a disease outcome study dose ...

    Started by dockiss‎, 09-19-2013 05:50 PM
    • Replies: 0
    • Views: 967
    09-19-2013, 05:50 PM Go to last post
  50. Which test to perform and how?

    I would like to do a statistical test and I'm not sure which is appropriate. I have data reflecting different time durations (6 to 12 minutes) and...

    Started by peroelle‎, 09-19-2013 02:28 PM
    • Replies: 0
    • Views: 899
    09-19-2013, 02:28 PM Go to last post
  51. Question Which statistical test to compare population percentage change over time?

    Hi, I'm relatively inexperienced with statistical tests and I'm trying to figure out which test to use for the following: I am comparing three sets...

    Started by LizVango‎, 09-10-2013 07:24 AM
    comparision, different data sets, species population, trends
    • Replies: 1
    • Views: 4,921
    09-19-2013, 01:54 PM Go to last post
  52. How to proceed analysing survey data

    Dear All, I am new to survey analysis and trying to analyse some survey data based on individual and their knowledge on their local leaders. I have...

    Started by ejain‎, 09-09-2013 12:48 PM
    analysis, chaid, cluster analysis, regression, survey
    • Replies: 1
    • Views: 1,115
    09-19-2013, 01:43 PM Go to last post
  53. Question Sample size calculation issues

    Hello, I have a question regarding a research project I'm working on. We have conducted an experiment where the same sample is measured over and...

    Started by elpollodiablo‎, 09-09-2013 01:10 PM
    sample size calculation
    • Replies: 1
    • Views: 1,760
    09-19-2013, 01:34 PM Go to last post
  54. Sampling error and non-sampling error

    I am extremely confused as to what the difference between a sampling error and a non-sampling error is. Can someone please explain?

    Started by FollowTheFez‎, 09-18-2013 03:47 AM
    • Replies: 3
    • Views: 974
    09-19-2013, 01:12 PM Go to last post
  55. Nonparametric Mann-Whitney U for 4 groups

    I have been trialling the effectiveness of a drug on brain injury and have treatment groups: 1) Control + drug 2) Control + vehicle 3) Injured +...

    Started by VickyProwse‎, 09-18-2013 07:01 PM
    • Replies: 2
    • Views: 1,396
    09-19-2013, 03:37 AM Go to last post
  56. Intervention vs. Control Group for Matched Pair, dichotomous data: McNemar Test?

    I have matched-pair, pass/fail data on a reading test for 2010 and 2012. I have this for an intervention group and a control group of students. I'm...

    Started by mbetennis01‎, 09-18-2013 04:28 PM
    dichotomous, matched pairs, mcnemar test
    • Replies: 2
    • Views: 3,893
    09-18-2013, 06:09 PM Go to last post
  57. Two-Way ANOVA

    Please disregard previous post, it just shows how messed up I am!!!:) My problem is: A two-way ANOVA shows significant interaction, but both...

    Started by omnigenuity‎, 09-17-2013 10:29 PM
    • Replies: 2
    • Views: 2,080
    09-18-2013, 04:51 PM Go to last post
  58. logistic regression - very high Nagelkerke’s Pseudo-R2 values

    Hi all, I have a data set made of 12 years each one with a number of males and a number of females. I tested the relationship between the sex...

    Started by simone77‎, 09-17-2013 12:12 PM
    • Replies: 5
    • Views: 31,974
    09-18-2013, 04:15 PM Go to last post
  59. Manipulating the X and Y Values within the regression data

    Assume that least-squares estimates are obtained for the relationship Y=a+bX. After the work is completed it is decided to multiply the units of the...

    Started by THarps22‎, 09-18-2013 10:09 AM
    • Replies: 0
    • Views: 850
    09-18-2013, 10:09 AM Go to last post
  60. Trying to find the correlation for 2 variable when controlling for 2 other variables

    I summed up some of the info we are already provided: N=50 Having job and exam performance--- r= -.3 Having job and and Studying--- r= -.4...

    Started by Lisa3449‎, 09-18-2013 10:02 AM
    calculating correlation, correlation, partial correlation, variables
    • Replies: 0
    • Views: 1,534
    09-18-2013, 10:02 AM Go to last post

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