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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 11:13 AM
    • Replies: 1
    • Views: 127,229
    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: 35,619
    09-30-2005, 09:44 AM Go to last post
  1. Smile which test to use for comparing samples with single observation???

    Hello! I am testing percent genotoxicity of water samples using a bioassay which is expensive to perform and therefore cannot have replicates. Each...

    Started by sk2‎, Yesterday 12:24 AM
    • Replies: 2
    • Views: 192
    Yesterday, 01:19 PM Go to last post
  2. 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, Yesterday 12:45 PM
    lognormal, standard deviation
    • Replies: 0
    • Views: 96
    Yesterday, 12:45 PM Go to last post
  3. 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, Yesterday 09:23 AM
    spss correlation test
    • Replies: 0
    • Views: 111
    Yesterday, 09:23 AM Go to last post
  4. 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: 142
    Yesterday, 05:48 AM Go to last post
  5. 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: 469
    06-22-2016, 11:26 AM Go to last post
  6. 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: 104
    06-22-2016, 11:11 AM Go to last post
  7. 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: 130
    06-22-2016, 11:00 AM Go to last post
  8. 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: 141
    06-22-2016, 06:50 AM Go to last post
  9. 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: 329
    06-22-2016, 06:02 AM Go to last post
  10. 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: 110
    06-22-2016, 04:46 AM Go to last post
  11. 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: 173
    06-22-2016, 03:34 AM Go to last post
  12. 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: 345
    06-21-2016, 08:46 PM Go to last post
  13. 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: 111
    06-21-2016, 12:45 PM Go to last post
  14. 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: 121
    06-21-2016, 10:26 AM Go to last post
  15. 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: 121
    06-21-2016, 03:24 AM Go to last post
  16. 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: 164
    06-20-2016, 03:34 PM Go to last post
  17. 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: 139
    06-20-2016, 08:38 AM Go to last post
  18. 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: 402
    06-20-2016, 08:22 AM Go to last post
  19. 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: 168
    06-20-2016, 02:18 AM Go to last post
  20. 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: 185
    06-19-2016, 02:55 PM Go to last post
  21. 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: 212
    06-19-2016, 08:15 AM Go to last post
  22. 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: 259
    06-19-2016, 03:00 AM Go to last post
  23. 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 09:13 AM
    • Replies: 1
    • Views: 210
    06-17-2016, 11:55 AM Go to last post
  24. 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: 170
    06-17-2016, 11:53 AM Go to last post
  25. 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 06:57 AM
    • Replies: 1
    • Views: 182
    06-17-2016, 11:53 AM Go to last post
  26. 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: 640
    06-17-2016, 10:32 AM Go to last post
  27. 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: 221
    06-17-2016, 09:05 AM Go to last post
  28. (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: 204
    06-17-2016, 03:22 AM Go to last post
  29. 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: 182
    06-17-2016, 03:04 AM Go to last post
  30. 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: 325
    06-16-2016, 11:07 AM Go to last post
  31. 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: 228
    06-16-2016, 06:20 AM Go to last post
  32. Comparing polluted vs non-polluted sites - Statistical approach?

    Hi, In a forest area I want to compare two groups: polluted sites vs non-polluted sites. This is done by collecting species from three different...

    Started by Riqi‎, 06-16-2016 05:33 AM
    • Replies: 0
    • Views: 222
    06-16-2016, 05:33 AM Go to last post
  33. Sample Size Determination

    Letís say I have a population of 70000. The goal is to get a ďstatistically significantĒ sample (respondents ) for a survey. The sample size is...

    Started by Curious George‎, 06-15-2016 07:58 PM
    • Replies: 0
    • Views: 200
    06-15-2016, 07:58 PM Go to last post
  34. Multiple testing: Rate of false positives

    Hello all, I hope you're well. I have an elementary question that I hope someone can help me with. I am reading this protocol: Love MI,...

    Started by MexicanBiologist‎, 06-15-2016 02:15 PM
    • Replies: 1
    • Views: 251
    06-15-2016, 03:02 PM Go to last post
  35. Question Comparing 2 shops - based on Prices

    Dear all, I have a problem here: suppose I wish to compare 2 electronic gadget shops, I want to know which shop's prices are lower in general. ...

    Started by martinl‎, 06-14-2016 08:51 AM
    • Replies: 2
    • Views: 319
    06-15-2016, 03:21 AM Go to last post
  36. Paradox? setting up sampe size with alfa and beta error and analyzing it with t-test

    There seems to be some strange things: 1) you want to set-up a Design of experiments: using statistics tools; size = 10 ; alfa = 0.05 ; difference...

    Started by bartallaert‎, 06-14-2016 06:50 AM
    • Replies: 0
    • Views: 273
    06-14-2016, 06:50 AM Go to last post
  37. What test should I use?

    Hi, I am trying to do a statistical analysis on some data I collected at Uni and I am really confused about which test to use. I applied a range...

    Started by Bonnie2016‎, 06-13-2016 07:15 AM
    logistic regression
    • Replies: 1
    • Views: 273
    06-13-2016, 09:36 AM Go to last post
  38. Question Working out standard deviation for three random variables with different sized ranges

    X = {1,2,3,4,5,6}, Y = {1,2,3,4}, Z = {2,4,6,8}. The question is: work out standard deviation of A = 2S-1, where S = the sum of the three random...

    Started by aigarsplatinum‎, 06-12-2016 05:45 PM
    probability, randomvariable, standarddeviation, statistics assignment, variance
    • Replies: 0
    • Views: 236
    06-12-2016, 05:45 PM Go to last post
  39. Pillaiís Trace

    Of the 4 test statistics commonly used for MANOVA why is Pillaiís Trace used most often?

    Started by pupupanda‎, 06-12-2016 04:20 PM
    statistic, statistical analysis, statistical help
    • Replies: 0
    • Views: 207
    06-12-2016, 04:20 PM Go to last post
  40. Parametric or non-parametric test?

    Dear all, Iím not fluent in statistical data analysis and I canít afford the services of a professional. Please I really need your suggestions with...

    Started by Maxilo‎, 06-12-2016 12:34 PM
    • Replies: 2
    • Views: 209
    06-12-2016, 02:35 PM Go to last post
  41. Equivalency testing - CI approach and TOST don't match

    Hey everyone, I'm doing some equivalency testing with both the CI approach and TOST to demostrate the equivalency of two scanning methods. For...

    Started by Charlotte123456‎, 06-12-2016 11:15 AM
    confidence intervals, equivalnecy testing, normal distribution, p values
    • Replies: 5
    • Views: 242
    06-12-2016, 02:18 PM Go to last post
  42. Smile test of logistic regression constant

    Hello, everyone! I wonder whether anyone knows how can i intepret a coefficient of constant in logistic regression. I have used "logistic" in...

    Started by Lisa92‎, 06-12-2016 05:10 AM
    logisitic regression, odds, odds ratio
    • Replies: 1
    • Views: 167
    06-12-2016, 12:14 PM Go to last post
  43. Simspons Diversity Index

    I have calculated the simpsons diveristy index for three different strata: Understorey (1-D= 0.55), Subcanopy (1-D=0.77), canopy (1-D=0.83) How...

    Started by deano6‎, 06-10-2016 09:07 AM
    biology, significance, simpson's diversity index, spss
    • Replies: 1
    • Views: 229
    06-10-2016, 10:49 AM Go to last post
  44. Question Can we model the experiments as a stochastic process and estimate the sample size?

    I have an image with the size `5575x9440` and I'm implementing a modified version of the algorithm used in this paper on it, but because the code...

    Started by sepinaz‎, 06-10-2016 10:01 AM
    applied statistics, probability distributions, random variables, sampling, stochastic processes
    • Replies: 0
    • Views: 142
    06-10-2016, 10:01 AM Go to last post
  45. Paired T Test ???

    Hi I am trying to work out which statistical test to use to determine whether there is a relationship between visual acuity (how small letters on...

    Started by confused?‎, 06-07-2016 11:20 AM
    paired t, paired t-test
    • Replies: 5
    • Views: 306
    06-09-2016, 01:43 PM Go to last post
  46. Question Back transformation of p-values

    Hi everybody, I am currently working with some raw data which are not normally distributed (ND). I have now transformed the data with squareroot...

    Started by kimmieb‎, 06-07-2016 07:33 AM
    • Replies: 2
    • Views: 271
    06-08-2016, 04:18 PM Go to last post
  47. Reasons and advantages of using an ANCOVA instead of a Regression

    Hello everyone, Just wondering if any of you could help me. Just wondering when the variables Iím using can be used for both ANCOVA and...

    Started by ANCOVA'D‎, 06-08-2016 08:59 AM
    ancova, regression
    • Replies: 1
    • Views: 210
    06-08-2016, 02:46 PM Go to last post
  48. Mean/St.dev analysis

    Hello everyone, a pleasure for me to write in the community I'm currently looking to understand whether it sounds statistically correct the...

    Started by Talalapunzicher‎, 05-17-2016 04:25 PM
    • Replies: 1
    • Views: 296
    06-07-2016, 10:58 AM Go to last post
  49. I'm getting an asterik for p-value in minitab when I try to do a two-way ANOVA. Help

    I am trying to do a Two-Way ANOVA. I did what i think I need to do to have the p-value show up on the screen (after i click the button that starts...

    Started by ybekele‎, 06-06-2016 06:16 PM
    • Replies: 1
    • Views: 168
    06-07-2016, 06:30 AM Go to last post
  50. Thumbs up Newbie ...stats analysis of research survey using excel

    I am doing my Masters having not done any stats for 34 years , so I would like your help I have undertaken by survey , I have codified by data...

    Started by Epy‎, 06-07-2016 02:52 AM
    • Replies: 1
    • Views: 158
    06-07-2016, 04:34 AM Go to last post
  51. Correlation scenario

    Hi all I have a situation where I attempted to correlate the difference between mean pre and post exam scores to study time in a sample of around...

    Started by Darkest Horse‎, 06-06-2016 03:59 PM
    • Replies: 0
    • Views: 162
    06-06-2016, 03:59 PM Go to last post
  52. Is it possible to complete repeated measures Anova?

    I'm measuring 6 different factors 7 times. So in total I have 42 items - 6 times 1- factor; 6 times 2nd factor; 6 times 3rd factor; 6 times 4th...

    Started by Zhanna‎, 06-06-2016 02:26 PM
    • Replies: 0
    • Views: 116
    06-06-2016, 02:26 PM Go to last post
  53. are these samples independent?

    Sample 1 was selected to represent a population in 1 year. Sample 2 was selected to represent the same population in another year. Different...

    Started by stat_analyst‎, 06-06-2016 12:24 PM
    • Replies: 0
    • Views: 115
    06-06-2016, 12:24 PM Go to last post
  54. Discuss the implications of equal variance

    Part d) asks me to discuss the implications of part c). I conducted an f test of equal variances and I did not reject the null hypothesis.I stated...

    Started by k.dot‎, 06-05-2016 11:35 PM
    • Replies: 0
    • Views: 152
    06-05-2016, 11:35 PM Go to last post
  55. Logistic regression - how do I interpret Odds ratio & how do I explain a very high OR

    Hello, As part of my doctoral thesis I have completed a logistic regression to assess the impact of some parenting variables on recovery from a...

    Started by sallyr‎, 06-04-2016 04:32 AM
    • Replies: 5
    • Views: 284
    06-05-2016, 11:39 AM Go to last post
  56. Simple "controlling for population size difference" question

    Hello, I just had a ludicrous argument with a friend that we would like your help on settling. Let's assume the following: California...

    Started by feignfeign‎, 06-03-2016 12:03 PM
    • Replies: 2
    • Views: 222
    06-04-2016, 12:19 AM Go to last post
  57. Interpretation of a 2-way-interaction in the presence of a 3-way-interaction?

    Dear all, I have a question my Prof also has problems with and I canít find any answer in the web. Maybe I find somebody here who can help: I run...

    Started by Fred.‎, 06-03-2016 06:35 AM
    • Replies: 0
    • Views: 116
    06-03-2016, 06:35 AM Go to last post
  58. Is this moderation?

    I have been given an assignment to explore condom use (DV). The other variables are gender and fear of acquiring an STD. The literature review...

    Started by ChrisStudent‎, 06-01-2016 03:43 AM
    • Replies: 3
    • Views: 217
    06-03-2016, 04:58 AM Go to last post
  59. A question about data scales

    Hey everyone, So for a project I am supposed to decide on the most appropriate statistical analysis to investigate the relationship between the...

    Started by Fatkid53‎, 06-02-2016 11:56 AM
    • Replies: 0
    • Views: 153
    06-02-2016, 11:56 AM Go to last post
  60. Question How to show the MLE is weak consistent?

    Consider the model: Yt=at/T+et, t=0,...,T-1 e0,...,eT-1 be iid N(o,σ2) θ=' both...

    Started by moonscorpio‎, 06-02-2016 01:25 AM
    • Replies: 0
    • Views: 161
    06-02-2016, 01:25 AM Go to last post

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