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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: 200,392
    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: 68,590
    09-30-2005, 09:44 AM Go to last post
  1. Mean vs Standard Deviation Exercise

    Hey everyone. I would like to know your opinion on the following exercise: We have 2 coders teams (A and B). We want to choose the team who...

    Started by StatisticsCenas‎, 07-05-2016 09:41 AM
    mean standard deviation
    • Replies: 4
    • Views: 2,679
    07-06-2016, 01:38 PM Go to last post
  2. Question What test to use with 1 group?

    Hello Please provide assistance on what test to use for: 1 group with n = 500 Research QS: Is listening to whistling a problem? Question...

    Started by Aarti‎, 07-06-2016 03:00 AM
    what test to use
    • Replies: 1
    • Views: 1,363
    07-06-2016, 05:04 AM Go to last post
  3. Normal distribution

    Hi, X ~ Normal(15,8) Y ~ Normal 10, 6) How can I calculate Prob (X>Y)? if: (a) X and Y are not depending on each other with 0 correlation

    Started by samot79‎, 07-05-2016 02:17 AM
    • Replies: 1
    • Views: 1,153
    07-05-2016, 02:37 AM Go to last post
  4. Chi square test of independence - test of difference or association?

    Hi everyone, I understand chi square tests of independence, and have read the FAQ on chi square tests. What confuses me somewhat is the use of chi...

    Started by Frodo/Sociology‎, 06-28-2016 09:35 AM
    2 Pages
    1 2
    • Replies: 20
    • Views: 4,345
    07-05-2016, 01:42 AM Go to last post
  5. Creating standard normal distribution with difference variances within quartiles

    Hi, I have 10,000 data points referring to data on dogs that follow a positively skewed distribution that I have grouped into quartiles. I...

    Started by talkbox‎, 07-04-2016 05:08 PM
    normal distribution, variance components
    • Replies: 0
    • Views: 1,016
    07-04-2016, 05:08 PM Go to last post
  6. spss- questionnaire of two different groups

    hey there i have a questionnaire likert scale, which was filled be various colleges of both public and private sector. i have started to enter the...

    Started by jirrah‎, 07-03-2016 10:15 AM
    • Replies: 0
    • Views: 1,287
    07-03-2016, 10:15 AM Go to last post
  7. Predicted variable

    Dear all, I need help how to predict the hours variable from the model below. I used the mixed logit and have as a dependent variable y and hours...

    Started by Lena‎, 07-03-2016 07:18 AM
    • Replies: 1
    • Views: 1,451
    07-03-2016, 08:47 AM Go to last post
  8. Unhappy Power Calculation

    Hi Guys, Need your help please. I performed a study- 2 groups (independent) both had 55 patients. However my supervisor advises that I perform a...

    Started by skaur‎, 06-29-2016 02:49 PM
    • Replies: 6
    • Views: 1,629
    07-02-2016, 05:26 AM Go to last post
  9. Correlations computed within subject vs collapsing across subjects

    Hi everyone, I have model predictions (x) that I want to test against subject ratings (y). There are 20 stimuli per subject and I have data from...

    Started by wildetudor‎, 07-02-2016 02:02 AM
    • Replies: 0
    • Views: 1,650
    07-02-2016, 02:02 AM Go to last post
  10. Bayes' formula question help

    One percent of population cannot drive even if they try very very hard, but everyone applies for the driving license. The driving test fails those...

    Started by marcusdaz‎, 07-01-2016 04:51 PM
    bayes' theorem, probability
    • Replies: 1
    • Views: 2,051
    07-01-2016, 05:06 PM Go to last post
  11. Comparing two correlation coefficients

    I am trying to compare 2 independent correlation coefficients. Can I compare 2 independent rs using fisher z transformation test which one is a...

    Started by jocos‎, 06-30-2016 04:13 PM
    • Replies: 4
    • Views: 2,412
    07-01-2016, 08:06 AM Go to last post
  12. Confidence Intervals for Proportions -- Two ways to estimate population value?

    Hi everyone, I'm wondering if anyone could help shed some light on why there appear to be two different ways that different textbooks show to...

    Started by Frodo/Sociology‎, 06-28-2016 09:08 AM
    confidence interval
    • Replies: 8
    • Views: 1,611
    06-30-2016, 10:35 PM Go to last post
  13. Confidence Interval

    Hi all, I have a question for you that I hope one of you can answer: You sample 29 apples from your farm's harvest of 291 apples. The mean...

    Started by johnkkim‎, 06-30-2016 03:50 PM
    • Replies: 3
    • Views: 1,433
    06-30-2016, 05:32 PM Go to last post
  14. Smile Chi-square test of independence - post-hoc test for a r x c table

    Hi everyone, I have a question about chisq post-hoc tests. I'm analyzing a 4 x 7 contingency table. When running a chisq test of independence, I...

    Started by whateverman‎, 06-29-2016 09:09 PM
    • Replies: 2
    • Views: 1,378
    06-30-2016, 02:09 PM Go to last post
  15. Sample size needed?

    Hello. I am trying to determine how many samples I would need in order to get 90% of all the subjects within +/-15% of a value. In other words,...

    Started by RogerWilco‎, 06-30-2016 01:11 PM
    • Replies: 0
    • Views: 1,319
    06-30-2016, 01:11 PM Go to last post
  16. Sample Size. Binomial

    Hello everyone, I am trying to do an exercice where I have 30 batches of 200 units which have different number of faulty parts, as you can see in...

    Started by cgarcia‎, 06-29-2016 12:58 PM
    • Replies: 10
    • Views: 2,003
    06-30-2016, 11:09 AM Go to last post
  17. reliability effects components of variance

    Hello TalkStats community. I'm currently stuck with a problem, concerning how reliability of a process effects the variance of the process. let...

    Started by axoa‎, 06-29-2016 05:55 PM
    reliability, variance, weighted
    • Replies: 1
    • Views: 2,451
    06-30-2016, 06:50 AM Go to last post
  18. prediction of yearly order number

    Hi everyone, I am writing my master thesis In TUHH university of hamburg. In a part of my thesis i need the daily number of customer's order of...

    Started by Elnaz.h‎, 06-30-2016 02:09 AM
    • Replies: 0
    • Views: 1,686
    06-30-2016, 02:09 AM Go to last post
  19. Confidence Interval for mean

    Hello in a statistical problem, the population standard deviation was given to be 3 and the sample size is 49. in the problem i was asked to use 99%...

    Started by osamastat‎, 06-29-2016 09:26 PM
    • Replies: 1
    • Views: 1,330
    06-29-2016, 09:31 PM Go to last post
  20. Question Need help determining what test to use

    Hello, I would like to ask for help determining what test to use. In my assignment I need to determine if different candy causes cavities in...

    Started by Meribah‎, 06-29-2016 06:19 AM
    • Replies: 2
    • Views: 1,600
    06-29-2016, 11:27 AM Go to last post
  21. Significance test with one replicate (Biology)

    Hello everybody, I am new and and not that skilled in statistics. I think I have a quite simple question for you guys :) I am a biologist and I...

    Started by Dudldu‎, 06-28-2016 10:06 AM
    • Replies: 0
    • Views: 1,316
    06-28-2016, 10:06 AM Go to last post
  22. Ideal process of regression for amall samples

    I have a sample having 19 observations and 4 variables. Please tell me, which method of regression can be used here. Could I Cox's model of...

    Started by anjanray1971‎, 06-28-2016 05:11 AM
    • Replies: 0
    • Views: 1,315
    06-28-2016, 05:11 AM Go to last post
  23. How do I analyse a set of clinical data that has a variable number of measurements pe

    How do I analyse a set of clinical data that has a variable number of measurements per patient?‏ Thanks in advance for any help you can offer. I'm...

    Started by legolam‎, 06-27-2016 06:45 AM
    • Replies: 0
    • Views: 1,180
    06-27-2016, 06:45 AM Go to last post
  24. Question Finding threshold

    Hello, I'm a geographic student and I'm studying time series of vegetation index. I'm french and even if I'm quite fluent in communicating in...

    Started by Girish‎, 06-26-2016 04:39 AM
    • Replies: 4
    • Views: 1,328
    06-27-2016, 02:20 AM Go to last post
  25. Two IVs with three levels

    Hi, I'm a complete n00b when it comes to statistics, and I'm struggling to decide on the design for a statistics test, so I was wondering if...

    Started by fireloop‎, 06-26-2016 03:50 PM
    • Replies: 0
    • Views: 1,328
    06-26-2016, 03:50 PM Go to last post
  26. Question How to compare ranked list items

    I have compiled a survey asking respondents to rank social media by the amount of time they spend on each of 10 platforms. So if, for example, I...

    Started by Dumbasadog‎, 09-30-2015 05:37 PM
    • Replies: 5
    • Views: 1,826
    06-26-2016, 03:21 PM Go to last post
  27. Would I run an ANOVA or MANCOVA

    It is this lame question that I have to answer about redesigning a study. It is completely hypothetical. So I don't have everything I should have. i...

    Started by ajitpoore‎, 06-26-2016 02:33 PM
    • Replies: 0
    • Views: 1,743
    06-26-2016, 02:33 PM Go to last post
  28. Is there any other way to get LD50 for these cases when Probit does not yield results

    To determine a lethal dose 50 (LD50) (ie the dose or concentration of a compound that kills 50% of the insects) I have done a Probit regression. In...

    Started by jmeroglio‎, 06-26-2016 12:18 PM
    dose, ld50, lethal, probit
    • Replies: 1
    • Views: 1,465
    06-26-2016, 12:30 PM Go to last post
  29. Which method of data analysis

    Okay so I am tired. here is my issue. If I have a three data sets Parents education Student gender And student pre&post test scores ...

    Started by ajitpoore‎, 06-26-2016 06:05 AM
    • Replies: 2
    • Views: 1,411
    06-26-2016, 06:40 AM Go to last post
  30. Basic terminology

    I'm doing a research paper in international relations and I need some help describing the data. For example, in 13 interventions in civil wars, I...

    Started by datorres85‎, 06-25-2016 08:55 PM
    • Replies: 0
    • Views: 1,938
    06-25-2016, 08:55 PM Go to last post
  31. Lognormal distribution area within 1 standard deviation

    For a normal distribution I understand that area to left or right of mean within 1 standard deviation is same. What about log normal distribution,...

    Started by Vatsa‎, 06-23-2016 12:45 PM
    lognormal, standard deviation
    • Replies: 0
    • Views: 1,536
    06-23-2016, 12:45 PM Go to last post
  32. Interpreting the Spearman's correlation test coefficient and p-value

    I am currently trying to figure out how to use SPSS and understand the results that are generated by the different tests I'm performing on my data. ...

    Started by AppliedLinguisticsStats‎, 06-23-2016 09:23 AM
    spss correlation test
    • Replies: 0
    • Views: 954
    06-23-2016, 09:23 AM Go to last post
  33. Specifying the initial values of likfit function of geodata in R

    I have a geostatistical data. For analysis, I am using `geoR`. I want to estimate the parameters. But `likfit` or `variofit` function requires...

    Started by Cynderella‎, 06-22-2016 08:54 PM
    likelihood estimates, r code, spatial analysis, spatial data
    • Replies: 2
    • Views: 1,522
    06-23-2016, 05:48 AM Go to last post
  34. Why square root of n for standard error?

    Hi, I am trying to understand the formula for the standard error of the mean. OK so far, but: I don't understand why it is the square root of n...

    Started by Nina Lasek‎, 06-14-2016 08:24 AM
    • Replies: 4
    • Views: 2,762
    06-22-2016, 11:26 AM Go to last post
  35. interaction with covariate

    Hi, I'm running with SPSSS a repeated measure anova with 2 independent variables (let say A and B) and 1 covariate, C. I observe that: A X B...

    Started by I_BELIEVE_IN_P_VALUE‎, 06-22-2016 11:11 AM
    • Replies: 0
    • Views: 955
    06-22-2016, 11:11 AM Go to last post
  36. Large t values

    Hi, I'm studying the use of certain teaching techniques in Korean high schools, specifically comparing students' perceptions of the frequency of...

    Started by carruthers‎, 06-22-2016 10:38 AM
    • Replies: 1
    • Views: 1,280
    06-22-2016, 11:00 AM Go to last post
  37. Which test do I have to use?

    Hi! I hope someone can help me out with the following problem. I'm not the best at statistics... So I got 5 gorilla's which I observed. For...

    Started by DaanDuijm‎, 06-22-2016 03:27 AM
    behavior, gorilla, periods, significant, statistics
    • Replies: 1
    • Views: 1,385
    06-22-2016, 06:50 AM Go to last post
  38. Comparing data from single samples

    I measured mutations after drug treatment in two different lines (genotype A and B) at 3 different timepoints (1,2,3). Is there a test to see whether...

    Started by drb‎, 06-17-2016 04:11 PM
    • Replies: 3
    • Views: 2,064
    06-22-2016, 06:02 AM Go to last post
  39. Trying to establish a fair evaluation system for a company.. need help!

    I work for HR department of a company. Every year, different managers evaluate different employees. We are trying to upgrade our evaluation...

    Started by zeroheat‎, 06-22-2016 04:46 AM
    • Replies: 0
    • Views: 1,432
    06-22-2016, 04:46 AM Go to last post
  40. how to compare samples with single observations

    Hi I have a data for water sample genotoxicity. All data consists of single observations and no replicates. I want to compare samples with negative...

    Started by sk2‎, 06-21-2016 02:14 PM
    bc z
    • Replies: 2
    • Views: 1,420
    06-22-2016, 03:34 AM Go to last post
  41. Homework Help Please :)

    I am taking an online college course for Statistics and I am struggling.. I find it really hard to teach yourself statistics without a teacher's...

    Started by HLHLO‎, 06-15-2016 12:31 PM
    • Replies: 2
    • Views: 2,015
    06-21-2016, 08:46 PM Go to last post
  42. pls help about spss symmetric measures

    Why my answer of symmetric measure value of Pearson's R is postive and Spearmen Correlation is negative Pls contact me to answer my questions via my...

    Started by meemee‎, 06-21-2016 12:45 PM
    • Replies: 0
    • Views: 1,174
    06-21-2016, 12:45 PM Go to last post
  43. Regression with different lengths of data series

    Dear All, I am trying to do a multivariate regression, i.e. y = ax1+bx2. but x1 has data from year 1 to year 30, but x2 has only year 20 to year...

    Started by Yiwu‎, 06-21-2016 10:26 AM
    regression model
    • Replies: 0
    • Views: 1,043
    06-21-2016, 10:26 AM Go to last post
  44. Quick homework question

    Suppose X has density f, and Y has density g, is it possible that f(x) > g(x) for all x? Explain. I'm assuming the answer is no, but not sure how...

    Started by gat‎, 06-21-2016 03:24 AM
    • Replies: 0
    • Views: 1,216
    06-21-2016, 03:24 AM Go to last post
  45. Winning chance

    Would welcome statistical advice to maximize my winning chances with this game : A store gives out cards with four rub-off squares. Underneath...

    Started by Wondering‎, 06-20-2016 03:34 PM
    • Replies: 0
    • Views: 1,435
    06-20-2016, 03:34 PM Go to last post
  46. LOF : Local Outlier Factor

    I have a few questions about Lof : http://www.dbs.ifi.lmu.de/Publikationen/Papers/LOF.pdf 1. I don't understand of k-distance(o) inside...

    Started by AlexeyS‎, 06-20-2016 08:38 AM
    lof, outliers
    • Replies: 0
    • Views: 1,740
    06-20-2016, 08:38 AM Go to last post
  47. Using Pre-Post data in a meta-analysis

    Hello, I am trying to figure out the best way to calculate an effect size for a single-group design when I do not know the pair-wise correlation...

    Started by Dan Ko‎, 06-13-2016 08:42 AM
    effect size, meta-analysis, non-independent, pre/post
    • Replies: 4
    • Views: 1,997
    06-20-2016, 08:22 AM Go to last post
  48. Successive Probabilistic Events

    I have some secret code that I need to hack so I know what it is saying. In a single event I pass the problem to four computers in succession. The...

    Started by Sdruley‎, 06-20-2016 12:59 AM
    • Replies: 2
    • Views: 1,215
    06-20-2016, 02:18 AM Go to last post
  49. Market Mix Models : Confidence in Coefficients

    In market mix models, my sales(y) depends on 4 promotions(p1--p4). Let (b11, b21, b31, b41 ) be the coefficients of p1--p4 in one iteration and (b12,...

    Started by rags140684‎, 06-19-2016 02:55 PM
    attribution models, market mix models, mixed models, random effects models
    • Replies: 0
    • Views: 918
    06-19-2016, 02:55 PM Go to last post
  50. Question HELP ! I am using the right method ?

    Hi, I am currently working on a project where I will check if humor has an effect on Facebook posts in terms of generating likes,comments and...

    Started by SocialStats‎, 06-19-2016 08:15 AM
    • Replies: 0
    • Views: 987
    06-19-2016, 08:15 AM Go to last post
  51. remarkable correlations

    Currently I'm writing my thesis on mindfulness and deviant workplace behavior. The mindfulness scale that I am using consists of four subscales...

    Started by Pooja Guptar‎, 06-18-2016 03:16 PM
    • Replies: 1
    • Views: 1,810
    06-19-2016, 03:00 AM Go to last post
  52. Inquiry about means comparision of factorial experiments

    urgent and important dear, friends I need clarification about comparison between interaction of treatments. If I've factorial experiment (2*3) with...

    Started by hazemalashwal‎, 12-21-2015 10:13 AM
    • Replies: 1
    • Views: 1,319
    06-17-2016, 11:55 AM Go to last post
  53. Separating Skill from Randomness in Binomials (baseball)

    With a stat like On-Base Percentage (OBP) in baseball, we can treat a sample of different players' stats as a mixture of both random binomial...

    Started by PokerStats‎, 03-25-2016 11:48 PM
    • Replies: 1
    • Views: 1,208
    06-17-2016, 11:53 AM Go to last post
  54. Survey design question

    I am designing a household survey with a sample size of 400. This is a two stage design with 40 clusters selected at first stage and 10 households...

    Started by abeshkkc‎, 12-08-2015 07:57 AM
    • Replies: 1
    • Views: 1,203
    06-17-2016, 11:53 AM Go to last post
  55. SPSS: The Independent Samples table is not produced.

    Hi everyone, I am desperately trying to get my head around the reason why I cannot run an Independent t-test using for the variables "Height"...

    Started by CadizMiranda‎, 06-16-2016 04:12 PM
    • Replies: 3
    • Views: 2,566
    06-17-2016, 10:32 AM Go to last post
  56. Question What test to use? 2 IV & 1 DV

    Hello everybody, I am currently stuck in my analysis with a probably very simple question. I have a continous dependent variable (1-5) and an...

    Started by Logi‎, 06-17-2016 09:05 AM
    • Replies: 0
    • Views: 1,424
    06-17-2016, 09:05 AM Go to last post
  57. (R) Analysing abundance in plots with different treatments -with factorial ANOVA?

    I'm not connected to a Uni anymore, but want to write an article on my friend's data from her Master's while applying for a Phd. The data will...

    Started by Wood4‎, 06-17-2016 03:22 AM
    factorial anova
    • Replies: 0
    • Views: 1,072
    06-17-2016, 03:22 AM Go to last post
  58. SPSS: correlate or regression in broad form

    Hey! I was wondering, I have 5 dependent variables and 2 within subject factors with 2 conditions. These are in a broad structure in SPSS, which...

    Started by Ros‎, 06-17-2016 03:04 AM
    correlate, regression, restructure, spss, within subjects
    • Replies: 0
    • Views: 983
    06-17-2016, 03:04 AM Go to last post
  59. What tests to unleash on the data?

    Hey everyone! So here's some background: I'm doing a course on data-analysis and my teacher likes the idea of us finding our own solutions, so...

    Started by Murr‎, 06-16-2016 11:07 AM
    analysis help, exam, homework, spss
    • Replies: 0
    • Views: 1,642
    06-16-2016, 11:07 AM Go to last post
  60. How to calculate individual mean for all elements ?

    Hi , Can anyboby tell me how to do calculate mean for each and every elements? 1,2,3,4,5 = Normal mean= 3 it is well known , obvious, average...

    Started by Muthukumar‎, 06-16-2016 06:20 AM
    • Replies: 0
    • Views: 1,441
    06-16-2016, 06:20 AM Go to last post

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