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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: 196,581
    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: 66,632
    09-30-2005, 09:44 AM Go to last post
  1. Chi Squared Distribution using R

    Hi. How do I calculate P (1<x<4) for a chi squared distribution with degrees of freedom = 3 using R Programming ? What commands in R should I use...

    Started by Lolita‎, 09-19-2014 07:39 PM
    #chisquare, #continuousintervals, #pdf, #rprogramming, #statistics
    • Replies: 4
    • Views: 2,233
    09-19-2014, 08:04 PM Go to last post
  2. 4 variables, 2 surveys.. how to link? please help!

    hi :wave: i have 2 surveys. The data is collected from both managers and subordinates, the first one has just one variable (moderator) and the 2nd...

    Started by Susielola‎, 09-16-2014 07:08 PM
    analysis method, data analysis, dissertation, masters degree, statistical analysis
    • Replies: 2
    • Views: 1,512
    09-19-2014, 07:18 PM Go to last post
  3. Can You Stat Test CVs?

    I am looking at survey data of users of a specific product type. Within the data set, I am looking at overall rating scores, which is derived from a...

    Started by Tipsy McStagger‎, 09-19-2014 01:08 PM
    • Replies: 0
    • Views: 1,256
    09-19-2014, 01:08 PM Go to last post
  4. Standard Error Calculation in DOE Screening

    Hello everyone, im working right now on a DOE Screening, and was trying to understand how the program calculates the Standard Error. It doesnt use...

    Started by fjorda‎, 09-18-2014 07:40 AM
    • Replies: 4
    • Views: 1,844
    09-19-2014, 09:08 AM Go to last post
  5. Non-Parametric Analyses. Report medians and 95% CI in graphs?

    Okay so, I'm currently writing my thesis, and I have to do non-parametric tests. I know that I have to report the medians in text. However, I'm...

    Started by Mimi‎, 09-18-2014 08:39 AM
    confidence intervals, graphs, help me!, median, non-parametric test
    • Replies: 4
    • Views: 1,883
    09-19-2014, 01:26 AM Go to last post
  6. Question Question about histogram construction

    Hello. I know this may be an obvious answer, but my instructor has given me this question Part I. The following twenty data are the yields of the...

    Started by BasicStatistics‎, 09-16-2014 02:50 PM
    data analysis, data analytics, histogram
    • Replies: 5
    • Views: 1,743
    09-17-2014, 09:25 PM Go to last post
  7. Confidence interval help needed

    Hey guys, Its been a while since I did a CI so I am a bit rusty. I had 19 steel pins which all had an actual diameter of .375 in, so mean is...

    Started by bigbob‎, 09-16-2014 08:56 PM
    • Replies: 4
    • Views: 2,078
    09-17-2014, 06:58 AM Go to last post
  8. Hypothesis test for the difference of the difference of means??

    Hello all, Consider 3 different samples. Each sample is independent. 1: 23, 25, 21, 22, 21, 22, 20, 23, 19, 22, 19, 21 2: 28, 27, 27, 29,...

    Started by CaptainP‎, 09-16-2014 11:49 PM
    • Replies: 1
    • Views: 1,560
    09-17-2014, 12:13 AM Go to last post
  9. Thumbs up Z Scores - Can I calculate an average on 2 Z-scores or should it be on raw data?

    Hi there, I have a series of Z-scores that are calculated twice for a single subject (they are similar but taken at 2 different times). But...

    Started by EatingChickenWings‎, 09-16-2014 10:26 AM
    average, z scores
    • Replies: 1
    • Views: 1,462
    09-16-2014, 10:56 AM Go to last post
  10. Correlation with categorical control variables - which test to use?

    Hi, I’m looking for some help in choosing the right statistical test for my research objective. I am new to statistics, so let me describe what...

    Started by Lefthans‎, 09-16-2014 09:27 AM
    • Replies: 0
    • Views: 2,314
    09-16-2014, 09:27 AM Go to last post
  11. Exclamation Is this variance for grouped data??

    Apologies for the newb question... it'll probably seem extremely obvious but I struggle with math and my exam is tomorrow... My tutor wrote down...

    Started by riptide‎, 09-15-2014 06:56 PM
    • Replies: 2
    • Views: 2,426
    09-15-2014, 07:45 PM Go to last post
  12. Confidence interval for Kendall's Tau-C

    Hi, I am conducting a Kendall's Tau-C correlation test (in SPSS), and I was wondering if there is any software or instructions on how to create a...

    Started by oxnard_montalvo‎, 09-14-2014 07:47 PM
    • Replies: 2
    • Views: 5,296
    09-15-2014, 07:17 PM Go to last post
  13. Real Life Problem - Removing Outliers from a large dataset of continuous data

    Hey there, I started a job recently and found myself working with data that has outliers. They need to be thrown out using microsoft access or...

    Started by kthomas9‎, 09-15-2014 05:19 PM
    continuous data, statistics business
    • Replies: 1
    • Views: 2,032
    09-15-2014, 05:33 PM Go to last post
  14. variable type and level of measurements

    Hello all There are 4 levels of measurement I am aware of: Nominal, Ordinal, Interval and Ratio. I am trying to find the connection of the...

    Started by Yankel‎, 09-11-2014 12:10 PM
    • Replies: 5
    • Views: 2,101
    09-15-2014, 05:01 PM Go to last post
  15. normal distribution

    Please help me to solve the problem Let Y1, Y2, . . . , Y9 be a random sample of size 9 from a normal distribution where μ = 2 and σ = 2. Let Y ∗...

    Started by debaprosad‎, 09-15-2014 11:55 AM
    • Replies: 1
    • Views: 1,453
    09-15-2014, 12:01 PM Go to last post
  16. Considerable controversy

    Please guide me to solve the problem. Actually I cannot understand where to start and where to end and what to solve out? Considerable controversy...

    Started by debaprosad‎, 09-15-2014 11:51 AM
    • Replies: 1
    • Views: 3,424
    09-15-2014, 12:00 PM Go to last post
  17. Exclamation Compare results of a repeated survey if respondents weren't 100% the same each time?

    Hello, I have spent many days trying to figure out how to analyze the difference in responses to a survey that was taken 3 times (pre-educational...

    Started by Neophyte‎, 09-15-2014 11:30 AM
    • Replies: 0
    • Views: 1,443
    09-15-2014, 11:30 AM Go to last post
  18. RM ANOVA vs. ANCOVA question

    Hi stats friends! I'm trying to decide whether to use an RM ANOVA vs. an ANCOVA to test a question and I could use your help. Participants were...

    Started by CityGirlPhD‎, 09-15-2014 09:38 AM
    ancova, anova, repeated measures
    • Replies: 0
    • Views: 1,276
    09-15-2014, 09:38 AM Go to last post
  19. Question Theory Question - Purpose of Bootstrapping when we have the CLT?

    Hi all, This may just be a case of me miss-understanding the CLT, BUT: If from the CLT we can deduce that the SE of a sample statistic is...

    Started by Craig1‎, 09-15-2014 03:09 AM
    • Replies: 2
    • Views: 1,539
    09-15-2014, 03:57 AM Go to last post
  20. Contextual Effect Question

    I am looking for general thoughts on the following circumstance. I am working on a problem for a colleague in which he has some outcome Y at T2...

    Started by Lazar‎, 09-14-2014 11:07 PM
    multilevel modeling
    • Replies: 1
    • Views: 1,778
    09-15-2014, 12:11 AM Go to last post
  21. Post covariance between two observations belonging to the same block

    Hi, does anyone know how to find the expression for the covariance between two observations belonging to the same block for a balanced complete...

    Started by mari_08‎, 09-14-2014 03:49 PM
    blocking, blocks, covariance, planning, statistics
    • Replies: 2
    • Views: 1,486
    09-14-2014, 04:54 PM Go to last post
  22. Dissertation Correlation Course Selection with Locus of Control

    Is there a statistically significant difference in the locus of control of students who select online versus traditional classroom format? I am...

    Started by lbrennec‎, 09-13-2014 01:03 PM
    • Replies: 1
    • Views: 1,159
    09-13-2014, 02:45 PM Go to last post
  23. Probability problem

    As per my calculation the answer is 50*.4382 = 21.91 or 22 in approx. Please guide me whether I am right or wrong. Please help me to solve the...

    Started by debaprosad‎, 09-13-2014 01:54 AM
    • Replies: 1
    • Views: 3,092
    09-13-2014, 12:13 PM Go to last post
  24. Exclamation How to set up Friedman test, based off of data from a series of anonymous surveys?

    I was asked to run a Friedman test off of a survey taken three times (Time 1, Time 2, and Time 3) on one and the same population. My study...

    Started by Neophyte‎, 09-12-2014 08:27 PM
    • Replies: 2
    • Views: 1,369
    09-13-2014, 12:06 PM Go to last post
  25. Selecting subgroup with given mean and standard dev. below given value

    I have a group of subjects with variable age and I would like to select a sub-group with given number of subjects where all selected subjects have...

    Started by fiji‎, 09-12-2014 04:26 PM
    sampling strategy, selection
    • Replies: 0
    • Views: 1,407
    09-12-2014, 04:26 PM Go to last post
  26. ICC for inter-rater agreement for categorical data?

    hi there I conducted a study were 2 raters assessed image quality on a 1-5 scale (1,2,3,4,5) (categorical data). A reviewer now suggests to add...

    Started by ogcdark‎, 09-06-2014 06:35 AM
    • Replies: 2
    • Views: 2,915
    09-12-2014, 12:11 PM Go to last post
  27. Type II Error problem in hypothesis testing

    I have tried to solve the problem many times, as the follows:::=> P(type II error|μ = 220)= p(z < (240-220)/10)) = .0228, Please confirm me...

    Started by debaprosad‎, 09-11-2014 10:43 PM
    • Replies: 1
    • Views: 1,718
    09-11-2014, 10:50 PM Go to last post
  28. How to re-rank scores by creating a multiplier from an average

    A study was done in which 200 cities were ranked for safe driving according to the number of accidents that occurred in each city. It's the report...

    Started by Petros‎, 09-11-2014 03:27 PM
    • Replies: 0
    • Views: 1,859
    09-11-2014, 03:27 PM Go to last post
  29. Using range instead of standard deviation?

    In what circumstances would it be better to use the range than the standard deviation?

    Started by dudeman74‎, 09-11-2014 12:34 PM
    • Replies: 10
    • Views: 3,432
    09-11-2014, 03:21 PM Go to last post
  30. Z score per Class or Z score across all classes

    Hi, I have been trying to understand Z score to normalize and pick the top 15% of students in a school with 5 grades. Student in each grade is...

    Started by statsnewbie1‎, 09-11-2014 02:37 PM
    • Replies: 0
    • Views: 1,555
    09-11-2014, 02:37 PM Go to last post
  31. Calculating correlation with unknown sample size

    Hello, friends. Here is the question that I would like answered. I have literally been sitting here for over an hour trying to find the solution on...

    Started by nche‎, 09-10-2014 11:37 PM
    correlation, homework
    • Replies: 2
    • Views: 5,486
    09-11-2014, 01:12 PM Go to last post
  32. How to find hidden patterns in data that seem chaotic?

    Hi guys, please forgive if this is too trivial problem. However all my statistics knowledge is limited to excel and SPSS. And I can't seem to figure...

    Started by mikemeh‎, 09-08-2014 11:50 AM
    • Replies: 7
    • Views: 1,997
    09-11-2014, 05:16 AM Go to last post
  33. Data Mining Tools for Panel Data

    Hi, I have a panel data which includes years 2009 to 2013. I want to use SPSS Clementine to analyze this data. Which data mining tools should ı...

    Started by fritz35‎, 09-10-2014 11:04 PM
    • Replies: 0
    • Views: 733
    09-10-2014, 11:04 PM Go to last post
  34. Predicting a Finite Sequence of Events

    Hello everyone, I have very little experience with statistics, but I have a general problem that I think it might be applicable to. My primary...

    Started by dmbsets‎, 09-10-2014 11:49 AM
    prediction, sequence, vocabulary
    • Replies: 1
    • Views: 995
    09-10-2014, 03:47 PM Go to last post
  35. Overlapping sample: t test with partial pairing??

    Hi - I've a work project that requires a stat test between Product A and Produce B performance ratings (On a scale of 1 to 5 how well did Product...

    Started by JAaron‎, 09-08-2014 04:54 PM
    overlap, partial pairing, t-test
    • Replies: 4
    • Views: 3,066
    09-09-2014, 10:25 AM Go to last post
  36. GLM with non-parametric post hoc testing?

    Hi guys, I have a question regarding the appropriate use of comparisons for independent samples (3 factor levels), please. Overall sample size is...

    Started by mayia‎, 09-09-2014 05:11 AM
    glm, kruskal-wallis, post hoc, variance homogeneity
    • Replies: 1
    • Views: 1,373
    09-09-2014, 07:51 AM Go to last post
  37. Which statistic test to use?

    I will like to make a statistic analysis on some data but do not know which test to use. My data is listed below (I have 3 treatments and one...

    Started by nsnsns‎, 09-05-2014 02:34 AM
    data, test, treatments
    • Replies: 4
    • Views: 2,159
    09-09-2014, 01:55 AM Go to last post
  38. Correct metodology to test observations

    Hello to all, I have two datasets of rain measurements, the first observed at the ground level, and the second estimated from satellite radar at...

    Started by Pedrobele‎, 09-06-2014 09:45 PM
    • Replies: 4
    • Views: 1,822
    09-08-2014, 08:19 PM Go to last post
  39. Help with clustering based on shopping category transaction freq

    hey there. Just wondering if anyone could lend their expertise on cluster analysis. Basically I am trying to see if I can find 5-10 customer...

    Started by chaidist‎, 09-05-2014 10:09 AM
    • Replies: 8
    • Views: 1,700
    09-08-2014, 01:20 PM Go to last post
  40. Which is more reliable? A Z-test (skewness and kurtosis) or Shapiro-Wilk?

    Hello! New member with a question :) I am testing my dependent variables for normality, and I am running several methods for it.. For "visual"...

    Started by Magg‎, 09-07-2014 06:20 AM
    • Replies: 5
    • Views: 2,355
    09-08-2014, 01:01 PM Go to last post
  41. Regular Sampling

    hi, I had the following question and I really wonder if I gave the right answer: Assume that you can measure a process once a day ( for the sake...

    Started by rogojel‎, 09-06-2014 03:01 AM
    sampling design
    • Replies: 6
    • Views: 2,027
    09-08-2014, 09:53 AM Go to last post
  42. Estimating Overall Portfolio Standard Deviation

    Is it possible to estimate the standard deviation of the combined portfolio of the following: - 20 assets; - where each asset has an annual...

    Started by biocentrism‎, 09-07-2014 11:58 PM
    • Replies: 1
    • Views: 1,254
    09-08-2014, 02:56 AM Go to last post
  43. stats

    Hi can anybody help me to start with question please.

    Started by arkeed178‎, 09-07-2014 08:31 AM
    • Replies: 2
    • Views: 1,253
    09-07-2014, 09:34 PM Go to last post
  44. Red face Needd Help Choosing Test : More than Two Proportions using SPSS

    New in Statistics: Help needed to choose the Correct Test: ( maybe Chi-square): I have following information: Type1 Type2 Type3 Type4 ...

    Started by edwincwc‎, 09-07-2014 08:48 AM
    • Replies: 11
    • Views: 3,389
    09-07-2014, 11:15 AM Go to last post
  45. standard deviation of multiple sample sets

    I'm trying to determine the standard deviation of multiple sample sets (measurements A, B, C taken on 3 different days), for which I know the means...

    Started by shoes‎, 02-07-2009 09:55 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 99,490
    09-07-2014, 01:28 AM Go to last post
  46. conduct a chi-squared test on 5point likert scale questionnaire

    Is it possible to conduct a chi-squared test on 5point likert scale questionnaire? If it is possible, please mentioned the procedure. Your early...

    Started by Chamika‎, 09-07-2014 12:44 AM
    • Replies: 0
    • Views: 2,708
    09-07-2014, 12:44 AM Go to last post
  47. Permanova + T-test

    Hello, I have a question regarding the data analysis listed below. I am trying to run a similar study but I can't truly understand why a PERMANOVA...

    Started by pattygoebs‎, 09-05-2014 10:12 AM
    fish, multivariate, multivariate analysis, permanova, t-test
    • Replies: 3
    • Views: 2,651
    09-06-2014, 05:38 PM Go to last post
  48. Proper name for scores calculated via formula

    Often in my field folks will take various count data and apply some formula to input different information and output some sort of summary. An...

    Started by trinker‎, 09-06-2014 07:28 AM
    definition, formula, scores
    • Replies: 6
    • Views: 1,727
    09-06-2014, 01:11 PM Go to last post
  49. Post Confidence interval of mean of queue length (M/M/1)

    Goodday, For a simulation course I had to simulate a single server queue with Poisson processes for arrival and departure (M/M/1). Now, this...

    Started by Knaapje‎, 09-05-2014 03:46 PM
    confidence, interval, m/m/1, sample, weighted
    • Replies: 3
    • Views: 2,382
    09-06-2014, 09:09 AM Go to last post
  50. Need some help in application of stats

    Dear all I have some data which I want to discuss with you and if possible someone can help in doing power analysis for this data? I have two...

    Started by ashu.doc‎, 09-05-2014 03:18 PM
    • Replies: 0
    • Views: 1,214
    09-05-2014, 03:18 PM Go to last post
  51. Buying a big ticket item and calculating "goodnes of deal"

    Hey all, so if you've followed any of my posts, you know I am thinking of buying a bigger rig. I am talking to everybody in my state and dealing...

    Started by Pk1023‎, 09-05-2014 08:49 AM
    • Replies: 1
    • Views: 1,079
    09-05-2014, 11:02 AM Go to last post
  52. Age as a Dependent variable in 2-way ANOVA?

    Hi, I have a dataset comprising of Ages and Genders of patients in two WardUnits. I want to determine if patient Ages differ by WardUnit and...

    Started by piney‎, 09-03-2014 08:29 PM
    • Replies: 9
    • Views: 2,529
    09-05-2014, 10:33 AM Go to last post
  53. Help with few intro statistic questions

    Hi guys, so I am starting to take Intro Stats, and I want to make sure I do well on this work packet. I attached the 3 pages and I will post my...

    Started by thrgk‎, 09-04-2014 06:19 PM
    • Replies: 0
    • Views: 1,161
    09-04-2014, 06:19 PM Go to last post
  54. Weights for weighted mean: Do these weights make sense?

    I'm attempting to weight a mean to make outliers less impactful. I know people use a median here often but am looking to try to make a mean that's...

    Started by trinker‎, 09-04-2014 08:41 AM
    average, outlier, robust
    • Replies: 8
    • Views: 2,127
    09-04-2014, 12:58 PM Go to last post
  55. Question Pearson vs Spearman correlation: Which to use in measurement data

    Hi everyone, I have a data set of measurements that I would like to test for a correlation with. However, I am unsure whether I want to use a...

    Started by cp51‎, 09-04-2014 10:46 AM
    • Replies: 0
    • Views: 1,459
    09-04-2014, 10:46 AM Go to last post
  56. Calculating effect size

    Hi, I'm just wondering what would be the best way to calculate effect size in this situation: I have three groups all with unequal sample sizes...

    Started by bobolococo‎, 09-04-2014 09:48 AM
    • Replies: 1
    • Views: 1,213
    09-04-2014, 10:04 AM Go to last post
  57. Survey Design Help

    Hi Everyone, I am having a lot of trouble figuring out the runs for a 2*3 4*4 survey design. From the following site, it is orthogonal at 16...

    Started by cuseinroch‎, 09-01-2014 02:24 PM
    • Replies: 4
    • Views: 1,533
    09-03-2014, 07:45 PM Go to last post
  58. Question Which statistic function should I use for comparing two data sets

    A quick example of what I am trying to do: Sample 1: Red - 10 Yellow - 20 Green -15 Sample 2: Red - 8 Yellow - 7 Green - 0

    Started by digitaLink‎, 09-03-2014 02:25 PM
    • Replies: 0
    • Views: 1,186
    09-03-2014, 02:25 PM Go to last post
  59. Difference between standard deviation and standard error

    Hi, what exactly is the difference between the SD and SE? I read through the wikipedia article but dont really understand the difference. Can...

    Started by beginner‎, 11-30-2009 05:14 AM
    confidence interval, standard deviation, standard error
    • Replies: 8
    • Views: 177,173
    09-03-2014, 11:48 AM Go to last post
  60. Finding similar numbers in multiple data sets

    Hi there. Hopefully I can explain my question correctly. Let's say I have three columns with some numbers as follows as follows: Column 1: 2, 3,...

    Started by noiseordinance‎, 09-03-2014 09:53 AM
    • Replies: 0
    • Views: 1,606
    09-03-2014, 09:53 AM Go to last post

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