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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: 197,299
    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: 67,050
    09-30-2005, 09:44 AM Go to last post
  1. Monte Carlo Integration with Computationally expensive Integrant

    Consider \mathcal{R}_x = \int_{x'} C(x|x')P(x')dx', where \mathcal{R}_x = risk of following input x C(x|x') = cost of following input x when in...

    Started by pemfir‎, 11-26-2015 12:40 PM
    intergation, monte-carlo
    • Replies: 0
    • Views: 858
    11-26-2015, 12:40 PM Go to last post
  2. chi-square test with very uneven binary variable and an ordered variable

    Hello everyone, this is probably a quite simple question, yet I would like to ask it here. I want to run a chi-square test between one binary coded...

    Started by andik‎, 11-24-2015 11:28 PM
    • Replies: 3
    • Views: 1,175
    11-26-2015, 03:35 AM Go to last post
  3. Question How to do the Time Series Forecasting, the right way?

    Hello all, I don't know much about the topic, but I want to learn. I have been given a time series in the form of (date, number). and I need to...

    Started by cybergeek‎, 11-24-2015 01:48 PM
    time series forecast
    • Replies: 1
    • Views: 1,269
    11-25-2015, 02:06 PM Go to last post
  4. Could you help to find useful method for my purpose?

    Hi everbody, I need to find a method which can answer my question: I have several parameters (at least 3) which are formed of raw data...

    Started by merveo‎, 11-25-2015 04:24 AM
    • Replies: 2
    • Views: 1,004
    11-25-2015, 11:42 AM Go to last post
  5. Compare odds in two fisher tests

    Dear all, I performed 3 fisher tests from data implicating in each test the same two sets (A & B) with two different sets in each case (A&B vs...

    Started by statQuery‎, 11-23-2015 11:02 AM
    chi, fisher, odds ratios
    • Replies: 6
    • Views: 1,619
    11-25-2015, 06:08 AM Go to last post
  6. Red face Create lognormal from a normal distribution

    Hello All, For a research I am doing I have a source that says that the range is 120 seconds to 1260 seconds, and that the mean is 356. Also, that...

    Started by Pabs‎, 11-23-2015 06:55 AM
    • Replies: 10
    • Views: 2,099
    11-24-2015, 05:34 PM Go to last post
  7. Test for paired, non parametric ethogram data

    Hello, I am having trouble discerning which statistical test would be appropriate to use. I am looking at number of "cleaning advertisements"...

    Started by Jake11‎, 11-24-2015 04:06 PM
    • Replies: 0
    • Views: 1,436
    11-24-2015, 04:06 PM Go to last post
  8. Which method to use when sample sizes are very different?

    Dear All, I'm trying to analyze the significance of difference between two groups. However the two groups have different sample size (one has 213...

    Started by aropro‎, 11-24-2015 08:47 AM
    • Replies: 5
    • Views: 1,599
    11-24-2015, 04:01 PM Go to last post
  9. Sample size calculation for 2 proportions

    Hello, I am required to calculated the required sample size in a clinical study where we know the variable is a proportion. I have been trying to...

    Started by rottemg‎, 11-23-2015 04:19 AM
    • Replies: 5
    • Views: 1,785
    11-24-2015, 07:16 AM Go to last post
  10. constructing a table from a binomial experiment

    Hello all new here and this is my first post. I am looking to check my work before I turn it in and hope that you will help me with that so here is...

    Started by norcal‎, 11-23-2015 07:07 PM
    • Replies: 2
    • Views: 1,478
    11-23-2015, 10:18 PM Go to last post
  11. Can you help me decide if there is statistical significance here?

    Hi, I've attached a word file - it contains exam results. There were two sessions - one AM and one PM. . I am trying to work out if there is a...

    Started by lost81‎, 11-23-2015 11:53 AM
    exam, moderation, significance, significance testing
    • Replies: 2
    • Views: 1,252
    11-23-2015, 12:28 PM Go to last post
  12. Minimum percentage in a distribution

    I have more than 40 values which are increasing linear continuously and in that distribution there are weightages allotted to each one. The maximum...

    Started by shanck‎, 11-23-2015 08:50 AM
    • Replies: 0
    • Views: 856
    11-23-2015, 08:50 AM Go to last post
  13. Post Beginner's stats: analysis of crime data

    I have two data sets of crimes in two different cities for a period of one year, by crime type, and by city area. If I perform two-sample t-test...

    Started by pavelk‎, 11-22-2015 11:03 AM
    • Replies: 2
    • Views: 1,499
    11-23-2015, 06:06 AM Go to last post
  14. Help: The Process Capability ....

    A process is in statistical control with x barbar = 751.5 and s = 2.5 Specifications are at LSL = 745 and USL = 755. (a) Estimate the process...

    Started by brooke‎, 11-22-2015 12:26 PM
    • Replies: 1
    • Views: 5,424
    11-22-2015, 01:20 PM Go to last post
  15. Why is log transformation valid?

    got my question answered thank you

    Started by paperrockbazooka‎, 11-19-2015 06:50 PM
    • Replies: 12
    • Views: 2,987
    11-21-2015, 03:06 PM Go to last post
  16. Product distribution of independent cosines

    I've got two independent, uniformly distributed, random variables α and . I'm trying to figure out the probability distribution of x = cos α cos ....

    Started by MackTuesday‎, 11-20-2015 02:28 PM
    • Replies: 2
    • Views: 1,270
    11-21-2015, 11:42 AM Go to last post
  17. Choosing the right probability distribution

    Hi, I have different response variables of migrating birds, which I want to investigate via regression: 1.) some kind of speed (distance per...

    Started by rotkehlpieper‎, 11-20-2015 12:08 PM
    probability distributions
    • Replies: 0
    • Views: 874
    11-20-2015, 12:08 PM Go to last post
  18. Likelihood with skewed distributions

    Hi I work in a hospital and we are trying to compare our activity with the national figures. The national activity distribution for the...

    Started by scotchpie‎, 11-20-2015 08:07 AM
    • Replies: 2
    • Views: 1,294
    11-20-2015, 08:21 AM Go to last post
  19. Exclamation reading Bland-Altman plot

    Hello, this is the plotting of about 200 double measurements (measured 200 samples with 2 different methods). Could I consider the 2 methods...

    Started by alfalfa‎, 11-19-2015 09:32 PM
    • Replies: 1
    • Views: 1,224
    11-20-2015, 08:06 AM Go to last post
  20. Hypothesis Testing - t test or ANOVA?

    Hi guys, I am doing a piece of work with an existing dataset and was looking for some advice. I have a group of subjects and controls and some...

    Started by arka‎, 11-19-2015 04:38 PM
    • Replies: 3
    • Views: 1,825
    11-20-2015, 07:36 AM Go to last post
  21. estimating expected value of a difficult cost function.

    suppose i want to compute the following expectation: E = \int C(x)f(x)dx where x follows a known pdf f(x) from which we can easily draw samples,...

    Started by pemfir‎, 11-20-2015 02:52 AM
    estimation, expectation
    • Replies: 1
    • Views: 1,322
    11-20-2015, 03:04 AM Go to last post
  22. Question Comparing two measuring methods ?

    Hi, I'd like to compare two devices to measure viscosity (like using two different kinds of weighing scales) on 6 different materials. Each...

    Started by alfalfa‎, 11-19-2015 04:09 AM
    • Replies: 3
    • Views: 1,592
    11-20-2015, 02:49 AM Go to last post
  23. Standard Deviation

    You select a random sample of n = 14 families in your neighborhood and find the following family sizes (number of people in the family). 15, 16,...

    Started by TierDenise‎, 11-19-2015 09:39 PM
    sample, standard deviation, statistics
    • Replies: 2
    • Views: 3,362
    11-19-2015, 10:20 PM Go to last post
  24. Lightbulb CLT and Proportions

    I would like to ask those of you who know their CLTs and Proportions a few questions. I am completing my HW right now and wanted do ask you guys a...

    Started by mathematicallyUNinclined‎, 11-19-2015 03:26 PM
    clt, feedback, proportions, stats
    • Replies: 0
    • Views: 1,271
    11-19-2015, 03:26 PM Go to last post
  25. Very New to Statistical Analysis Help!

    Hi Everyone, I am a grad student in the field of behavioral research in music education and I am working on a project to analyze the results of...

    Started by bwbryant76‎, 11-19-2015 02:46 PM
    • Replies: 1
    • Views: 1,216
    11-19-2015, 03:14 PM Go to last post
  26. interpretation of regression coefficients in categorical*continuous interaction

    Hello, I have been struggling with the interpretation of the coefficients in my multiple regression model and I hope you can help me with that! ...

    Started by Yana‎, 11-19-2015 05:12 AM
    categorical predictor, continuous moderator, interaction effect, regression coefficient, spotlight analysis
    • Replies: 0
    • Views: 1,047
    11-19-2015, 05:12 AM Go to last post
  27. Repeated measurements ANOVA with unequal sample sizes

    Hi all, I have conducted an experiment where the subject is first presented with a set of 7 stimuli. Thereafter, the subject is presented with a set...

    Started by mhh‎, 11-19-2015 04:15 AM
    ranova, unequal sample sizes
    • Replies: 0
    • Views: 1,152
    11-19-2015, 04:15 AM Go to last post
  28. Help me with Empirical Methods

    Dear Gurus of statistics :wave: I am student in Germany and I have an exam after 2 days from Empirical methods :shakehead ... is it possible that...

    Started by Gayane‎, 11-17-2015 06:14 PM
    #empirical #r
    • Replies: 9
    • Views: 1,860
    11-19-2015, 03:08 AM Go to last post
  29. Determine Number of Users in Control and Treatment Groups

    I need to be able to determine how many users should be in a control group and how many users should be in the treatment group. I have read that it...

    Started by baltimoreMan‎, 11-18-2015 06:40 PM
    • Replies: 3
    • Views: 1,613
    11-18-2015, 09:42 PM Go to last post
  30. Correlation and Significance (SPSS)

    I did a correlation test and can't figure out how to interpret the data. I'm used to getting high Pearson correlations with low significance values,...

    Started by 41310602613‎, 11-18-2015 06:21 PM
    • Replies: 1
    • Views: 1,461
    11-18-2015, 08:12 PM Go to last post
  31. hypothesis testing, stuck at finding standard deviation

    here's the actual question: The calculated nitrogen content of pure benzanilide is 7.10%. Five repeat analyses of "representative" samples ...

    Started by risya896‎, 11-18-2015 05:52 AM
    homework help
    • Replies: 2
    • Views: 1,569
    11-18-2015, 05:42 PM Go to last post
  32. [SPSS - Kaplan-Meier] show curves for all patients AND subgroups

    In SPSS, is it possible to add the curve for all patients to a Kaplan-Meier plot which displays two subgroups? Another question: is there a...

    Started by cp44‎, 11-18-2015 02:42 PM
    • Replies: 0
    • Views: 1,824
    11-18-2015, 02:42 PM Go to last post
  33. Test Tomorrow Morning (3 questions unsolved)

    Been looking everywhere for the answer to these three questions and have come up blank. My honors stat test is tomorrow. I'm praying someone here...

    Started by Sampson‎, 11-17-2015 09:12 PM
    • Replies: 0
    • Views: 1,153
    11-17-2015, 09:12 PM Go to last post
  34. Cronhach Alpha for internal consistency

    Hi all, I have a question regarding calculate the Cronhach alpha for total score. For some psychometric measurements, I have a 50 items...

    Started by dolleye‎, 11-17-2015 08:55 AM
    • Replies: 7
    • Views: 2,162
    11-17-2015, 03:00 PM Go to last post
  35. Chi Square Probability (Critical Value)

    For an applied linguistics course I do need your help. Unfortunately , for Df= 1 the values beyond p < 0.001 are not available in chi-square...

    Started by argusrockbar‎, 11-17-2015 05:19 AM
    • Replies: 3
    • Views: 1,611
    11-17-2015, 12:03 PM Go to last post
  36. I am too new for words

    Ok, I am quite new to statistical analysis and will be training myself. I am working in Quality Assurance at a nuclear site. Here is the premise:...

    Started by Nukedaddy‎, 11-16-2015 02:13 PM
    model, static
    • Replies: 1
    • Views: 1,440
    11-17-2015, 07:58 AM Go to last post
  37. Question Which statistical test to use? Compare 5 categories with data (ratio scale)

    Dear all, I desperately in need! I have two samples (reports of 30 good and 30 bad companies). For each sample I classified statements in five...

    Started by MaxLenk‎, 11-16-2015 06:08 AM
    • Replies: 4
    • Views: 1,208
    11-17-2015, 03:15 AM Go to last post
  38. Lightbulb Urn Problem

    There are balls in an urn which are numbered from 1 to θ , we are interested in the number of balls in the urn and conduct a simple statistical...

    Started by Mr.Green‎, 11-15-2015 11:30 AM
    • Replies: 1
    • Views: 1,059
    11-15-2015, 10:25 PM Go to last post
  39. Poisson Distribution using probabilities

    If X follows a poisson distribution where P(X=1)=0.4,P(X=2)=0.6, what is the value of P(X=0)? How will I solve this question?

    Started by Ipsita Bhattacharya‎, 11-14-2015 11:53 AM
    poisson distribution, probability distribution
    • Replies: 5
    • Views: 1,572
    11-15-2015, 03:46 PM Go to last post
  40. Conceptual Question about Independent/Matched Sample t Test Calculations

    I'm trying to better understand something conceptually, and was hoping if a few users might be able to explain it I could understand it better. ...

    Started by Sshaw1529‎, 11-15-2015 03:37 AM
    independent sample t-test, variance
    • Replies: 0
    • Views: 1,114
    11-15-2015, 03:37 AM Go to last post
  41. Probability

    An MP3 player is loaded with 50 musical selections: 20 rock selections, 13 jazz selections, and 17 blues selections.? Edit The player is set on...

    Started by TierDenise‎, 11-14-2015 08:22 PM
    proability, statistics, statistics homework
    • Replies: 0
    • Views: 1,110
    11-14-2015, 08:22 PM Go to last post
  42. Calculation population size and analysis of a study comparing two outcomes

    Hi i'm having difficulty finding an answer to this specific problem. I'm preparing a pilot study comparing two medical devices. Each device...

    Started by superfly‎, 11-13-2015 10:47 AM
    medical problem, population, power, sample size
    • Replies: 0
    • Views: 1,002
    11-13-2015, 10:47 AM Go to last post
  43. Repeated measure analysis of means with varying sample size.

    I am looking to compare mean bite rate of the same fish populations across multiple days. Because they are the same populations they are not...

    Started by dominicruddock‎, 11-13-2015 08:14 AM
    repeated measures
    • Replies: 0
    • Views: 693
    11-13-2015, 08:14 AM Go to last post
  44. HELP me in choosing wich statistical analysis should I use?

    Hi all! I am trying to publish a scientific paper about a posibble correlation and link between varoius blood disorders and a specific laboratory...

    Started by Mephesto‎, 11-13-2015 06:28 AM
    health, healthcare, parametar, statistics
    • Replies: 0
    • Views: 1,372
    11-13-2015, 06:28 AM Go to last post
  45. Correction for attenuation or deattenuation factor

    Just stumbled across this and was wondering if others were familiar with it. Also, can someone give me the 10,000 foot overview of what it is about....

    Started by hlsmith‎, 11-12-2015 11:13 AM
    • Replies: 9
    • Views: 3,898
    11-12-2015, 11:57 PM Go to last post
  46. Correlation Test for a Particular Data Set

    How would I go about accounting for the negative slope of one data set while comparing it to another with a neutral slope? Attached is an image of...

    Started by lcubelongren‎, 11-12-2015 05:56 PM
    • Replies: 0
    • Views: 1,155
    11-12-2015, 05:56 PM Go to last post
  47. principal component analysis pca variable problem

    Hi everyone ^^ I want to apply a PCA (Principal Component Analysis) based on the following data but I have a problem (see picture 1) Knowing...

    Started by Yousra‎, 11-11-2015 02:03 PM
    • Replies: 2
    • Views: 1,263
    11-12-2015, 11:38 AM Go to last post
  48. Confused with Contrasts

    Hello, during the last days, I tried to understand the use of contrasts, but the more I read, the more I am confused. As far as I understand, a...

    Started by rotkehlpieper‎, 11-12-2015 04:20 AM
    contrast, contrast analysis, contrast coefficients
    • Replies: 0
    • Views: 1,233
    11-12-2015, 04:20 AM Go to last post
  49. How many days?

    I am currently working on daily data that is to be aggregated into monthly values. The number of observation days in any given month can vary...

    Started by tynemouthmatt‎, 11-11-2015 06:04 PM
    • Replies: 3
    • Views: 1,310
    11-12-2015, 02:44 AM Go to last post
  50. percentage errors of abundance

    Hello, I have a data set with a small sample size (17), but many samples within those samples - if that makes sense. We measured trees at many...

    Started by wdmn‎, 11-11-2015 08:29 PM
    • Replies: 0
    • Views: 1,062
    11-11-2015, 08:29 PM Go to last post
  51. shapiro wilk test

    Hello, I tested the residuals of a paired t test using the shapiro wilk test. It said I could not reject the null hypothesis, so the residuals are...

    Started by wdmn‎, 11-11-2015 03:37 PM
    • Replies: 3
    • Views: 973
    11-11-2015, 04:15 PM Go to last post
  52. Are these statements true

    My goal in posting this, is to be sure what I understand is true and accurate. Ultimately I need to explain to managers why so many (900 out of 40K)...

    Started by Grayco‎, 11-04-2015 12:23 PM
    • Replies: 2
    • Views: 1,891
    11-11-2015, 11:33 AM Go to last post
  53. Lightbulb What would you do?

    Hello everybody, I hope this is the right place. I am writing my thesis on Sport industry and I'm currently facing a statistical issue (of...

    Started by Sam Bernard‎, 11-11-2015 08:25 AM
    historical, independence, independence test, numerical variable, sample size
    • Replies: 4
    • Views: 1,313
    11-11-2015, 11:27 AM Go to last post
  54. Is t-student enough for comparing these?

    Hello, I'd like to compare two methods of measuring compounds quantity on chromatography paper, which we may call method A and method B (kind of...

    Started by alfalfa‎, 11-10-2015 08:17 PM
    • Replies: 3
    • Views: 1,607
    11-11-2015, 08:23 AM Go to last post
  55. testing assumptions with on an RDA

    Hello, I've read that a common error with regression analysis is that people fail to test their assumptions. I completed an RDA in CANOCO and...

    Started by wdmn‎, 11-08-2015 05:04 PM
    • Replies: 3
    • Views: 1,982
    11-10-2015, 07:51 PM Go to last post
  56. Chi squared and degrees of freedom

    Hi. If I have an expression that says a∈{0.5, 1.0, 1.5}. what are my number of degrees of freedom? 2? n-1? Furthermore is I have that X^2 (chi...

    Started by PERAV‎, 11-10-2015 08:10 AM
    • Replies: 4
    • Views: 1,843
    11-10-2015, 12:06 PM Go to last post
  57. Average distance of the dart (Dartboard)

    Hello I have been struggling with this questions for some time now and I have no idea how to start it. Can you guys give me some tips? "A large...

    Started by elektrokalle‎, 11-08-2015 01:53 PM
    dartboard, gaussian, random variable, statistic
    • Replies: 3
    • Views: 2,328
    11-10-2015, 04:18 AM Go to last post
  58. Sample Size Estimation for Dependent or Independent Groups?

    Hey everyone, I am new to this so please bear with me. I have been discussing a question with my fellow peers regarding sample size estimation....

    Started by Bananas‎, 10-12-2015 01:54 PM
    • Replies: 4
    • Views: 2,179
    11-09-2015, 06:39 PM Go to last post
  59. Sampling Protocol and Relative Sampling Error

    Ive been racking my brain over what is likely a straightforward problem, but a little different than what Im used to dealing with. Ive got a...

    Started by gmeadevt‎, 11-09-2015 03:00 PM
    confidence interval, relative standard error
    • Replies: 0
    • Views: 1,316
    11-09-2015, 03:00 PM Go to last post
  60. OLS Estimator with dummy variables

    crime = Bo + B1female + u crime 1= if person commints crime 0 = if not female 1= if person is female female 0= if not To find the OLS...

    Started by skg94‎, 11-08-2015 09:36 PM
    • Replies: 1
    • Views: 2,772
    11-09-2015, 05:02 AM Go to last post

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