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Forum: Statistical Research

Statistical theory and methodology. Mathematical statistics. Parametric inference. Nonparametric inference.

  1. Measurement error and correlation coefficients: a social-sciency approach...

    hello everyone! yesterday's chat on measurement error and regression made me think that it would be nice to demonstrate (from a social-science-like...

    Started by spunky‎, Yesterday 06:44 PM
    • Replies: 0
    • Views: 101
    Yesterday, 06:44 PM Go to last post
  2. 3x2 design - data analysis ANOVA/MANOVA? How to add interaction in the model?

    Hello, Discription of experiment I am researching "The effect of review valence and brand commitment on consumer's purchase intention" for my...

    Started by Stefan Stefanov‎, Yesterday 07:25 AM
    anova, interaction effect, manova, model fit, spss
    • Replies: 0
    • Views: 107
    Yesterday, 07:25 AM Go to last post
  3. Question VAR model definition

    Edit: Question Answered. Instead, could you please tell me how can I delete a topic once I post it, if that's possible. Cheers Greetings, I have...

    Started by Athinagoras‎, 04-18-2014 09:56 AM
    autoregressive, var, vector
    • Replies: 0
    • Views: 65
    04-18-2014, 09:56 AM Go to last post
  4. within-subject factor

    RQ: Is there an effect of the number of PEmax maneuvers on EMG amplitude? PEmax(within-subject factor: base, fatigue, rest), EMG amplitude...

    Started by eunkum1‎, 04-17-2014 10:23 AM
    • Replies: 0
    • Views: 96
    04-17-2014, 10:23 AM Go to last post
  5. Question Statistical test advice, currently thinking a MANOVA test.

    Hi, I'm sorry to bother everyone. I am collecting samples (continuous data) from 5 defined sites which can be split into 5 categories (A-E) (1...

    Started by Kututo‎, 04-16-2014 09:48 AM
    • Replies: 1
    • Views: 132
    04-17-2014, 08:07 AM Go to last post
  6. if weighted average is too small

    I have a metric in % and another column with the Number of accounts for each row. I created a weighted average using rhe 5 metric and the number of...

    Started by podarum‎, 04-15-2014 12:40 PM
    • Replies: 0
    • Views: 50
    04-15-2014, 12:40 PM Go to last post
  7. posthoc test for a within-subject factor

    I am doing MANOVA. I have a within-subject factor "fatigue". One variable is fatigue (baseline, fatigue, rest). One of the dependent variables is the...

    Started by eunkum1‎, 04-15-2014 09:51 AM
    • Replies: 0
    • Views: 100
    04-15-2014, 09:51 AM Go to last post
  8. chi-square

    I need to know if severely (all 52) depressed women more/less likely to commit violent /other crimes. How can I do Chi-Square with Fisher Exact Stat...

    Started by eunkum1‎, 04-10-2014 01:43 PM
    • Replies: 2
    • Views: 161
    04-10-2014, 05:09 PM Go to last post
  9. one sample t-test alternative

    Hello, I hope someone can help me, because I am getting crazy with this. Imagine the following scenario: I have several participants. Each...

    Started by ajestudillo‎, 04-09-2014 11:41 AM
    • Replies: 13
    • Views: 279
    04-10-2014, 07:08 AM Go to last post
  10. Which one should I trust : shapiro test or qq plot?

    Good evening everyone, Sorry if this question already exist, I searched but didn't find an asnwer. I am using 7-points likert scale for my...

    Started by typhoss‎, 04-08-2014 08:39 PM
    • Replies: 3
    • Views: 192
    04-09-2014, 05:02 PM Go to last post
  11. Post Model Verification: Verification of Environmental Dispersion Model

    I am working with an environmental dispersion model, that I am trying to verify with measured data. We have a six receptors (measurement stations) in...

    Started by Skyence‎, 04-09-2014 03:24 PM
    distributions, model validation, probability
    • Replies: 0
    • Views: 87
    04-09-2014, 03:24 PM Go to last post
  12. Exclamation Picking the correct test, need help urgently!

    Hello, I feel like the answer for this is probably really obvious but I am being missing it altogether. This is my data: Habitat Associating Not...

    Started by Annielk‎, 04-09-2014 09:16 AM
    assumptions, chi sq, independance, statistics
    • Replies: 3
    • Views: 153
    04-09-2014, 12:35 PM Go to last post
  13. Appropriate statistics where dataset contains only positive cases?

    Sorry if this sounds confusing or uses the wrong terminology, I'll do my best to explain. I have a data set of approximately 100 records, where...

    Started by spss_n00b‎, 04-07-2014 10:05 AM
    • Replies: 4
    • Views: 285
    04-08-2014, 02:51 PM Go to last post
  14. structuring a proof

    I am working on a problem to show that the non central f distribution is a generalization of the f distribution. I understand this conceptually but...

    Started by the42up‎, 04-08-2014 09:44 AM
    • Replies: 5
    • Views: 153
    04-08-2014, 10:12 AM Go to last post
  15. Research process

    Question 1: A researcher assumes that there is a correlation between the happiness of people and the welfare of the state they live in. How would...

    Started by Tadele‎, 04-08-2014 07:41 AM
    • Replies: 1
    • Views: 115
    04-08-2014, 08:28 AM Go to last post
  16. Student's T-test versus one-way ANOVA

    I need help on deciding which statistical test to report. This is not really a statistics problem per say, I've done the calculations already. My...

    Started by GrungyGoose‎, 04-05-2014 10:17 PM
    anova, students t test
    • Replies: 1
    • Views: 237
    04-06-2014, 09:45 AM Go to last post
  17. Trend index

    Hi I am looking for an index to understand if the trend of the distribution of a single variable is positive or negative and how quick is...

    Started by luca‎, 04-05-2014 05:32 AM
    • Replies: 2
    • Views: 158
    04-06-2014, 05:29 AM Go to last post
  18. within subjects factors

    I have two within subjects factors. One variable is fatigue (baseline, fatigue, rest). The other variable is the amplitude of swallowing muscle...

    Started by eunkum1‎, 04-03-2014 04:44 PM
    • Replies: 7
    • Views: 203
    04-04-2014, 09:56 PM Go to last post
  19. Wilcoxon and Anova? Confused!

    HI! I'm really quite new to stats so I apologise for glaring foolishness :P Basically in the study that I'm looking at is a within-subjects...

    Started by confused.stats‎, 04-04-2014 06:50 AM
    • Replies: 0
    • Views: 146
    04-04-2014, 06:50 AM Go to last post
  20. Which model to use for a meta-analysis? Fixed Vs Random effects model

    I'm having trouble choosing which model to use to analyze my findings. My meta-analysis is about how effective a drug is compared to placebo or no...

    Started by Katto‎, 04-02-2014 10:08 AM
    fixed effects model, met-analysis, random effects model, statistical research
    • Replies: 0
    • Views: 141
    04-02-2014, 10:08 AM Go to last post
  21. Post-Hoc tests after MANOVA

    Hello all, I am planning to perform a MANOVA using one independent variable which will contain 3 groups. Further I will include 5 dependent...

    Started by Thur667‎, 04-02-2014 04:00 AM
    • Replies: 0
    • Views: 118
    04-02-2014, 04:00 AM Go to last post
  22. Variation of Mantel test?

    Hello. I am new to this forum but it looks like it will be a great reference! For my thesis I used Mantel tests to compare non-parametric...

    Started by caddyhair‎, 04-01-2014 07:01 PM
    group comparison, mantel test, matrices, non-parametric
    • Replies: 1
    • Views: 164
    04-02-2014, 12:27 AM Go to last post
  23. Which basic stat test to use?

    I have done a lot of linear modeling for my thesis, however one of the unsolved stat problems I have should be a pretty basic issue. I am testing to...

    Started by zombie_kid‎, 03-31-2014 09:03 PM
    • Replies: 1
    • Views: 155
    04-01-2014, 04:17 AM Go to last post
  24. Mixed ANOVA - normal distribution with heterogeneity - transformation advice

    Hello, First time poster here. Any advice is appreciated: I'm doing analysis of clinical trial data using SPSS. I'm doing a mixed ANOVA looking...

    Started by KenSoona‎, 03-31-2014 03:03 PM
    anova, heterogeneity, levene's test, mixed anova, spss
    • Replies: 0
    • Views: 154
    03-31-2014, 03:03 PM Go to last post
  25. Different p-values for similar model

    Hello guys, I have a problem related to p-values. here's screen the problem is very high p-value of CPI in model 7, on the other hand CPI in...

    Started by WinstonHuxley‎, 03-31-2014 02:00 PM
    • Replies: 0
    • Views: 108
    03-31-2014, 02:00 PM Go to last post
  26. How to describe difference of sorting sequence of values between two groups?

    I have 6 variables (A,B,C,D,E,F) in two groups named X and Y. The sorting sequence of the values of the 6 variables between the two groups is...

    Started by gyxgyb‎, 03-31-2014 09:21 AM
    • Replies: 0
    • Views: 81
    03-31-2014, 09:21 AM Go to last post
  27. Optimimality condition for quantile estimators

    *OPTIMALITY, sorry. I'm trying to understand a passage in Koenker's Quantile regression book (p.33). It says: (note that y,x, are vectors and w...

    Started by marwinbosst‎, 03-31-2014 04:36 AM
    derivatives, directional, koenker, quantile regression
    • Replies: 0
    • Views: 89
    03-31-2014, 04:36 AM Go to last post
  28. Unhappy MANOVA, when independent variable is not multi-level and P value significance varies!

    My research has 4 independent variables and 4 dependent variables. My hypotheses are constructed in such a way that 1 independent variable's effect...

    Started by Sundone‎, 03-31-2014 04:26 AM
    anova, manova, p value
    • Replies: 0
    • Views: 112
    03-31-2014, 04:26 AM Go to last post
  29. statistical analysis of p-values (cryptographic random data testing)

    hi folks, this may take a bit of explaining, your patience appreciated. i've encountered a serious anomaly in a well-known encryption algorithm,...

    Started by lkcl‎, 03-28-2014 01:10 PM
    • Replies: 2
    • Views: 211
    03-28-2014, 04:02 PM Go to last post
  30. Alpha under .7 in experience sampling data for some measurement moments

    I am facing a problem with my experience sampling data: Some of my alpha (Cronbach) are under .70 for 25 out of 240 measurement moments. Sometime...

    Started by mtrott‎, 03-28-2014 08:26 AM
    alpha, diary study, experience sampling
    • Replies: 0
    • Views: 78
    03-28-2014, 08:26 AM Go to last post
  31. Meta-analysis: How should one handle non-significant studies containing no raw data?

    Let's say that I'm conducting a meta-analysis, looking at the performance of group A and group B with respect to a certain construct. Now, some of...

    Started by Speldosa‎, 03-25-2014 06:55 AM
    effect size, group differences, hypothesis testing, meta-analysis, power-analysis
    • Replies: 6
    • Views: 234
    03-26-2014, 08:22 AM Go to last post
  32. Can I test linear trend in a set of point estimates along with their standard errors?

    Hi, I have the following data as an example: time mean s.e. 1 .2 .001 2 .3 .001 3 ...

    Started by sunny3333‎, 03-24-2014 04:58 PM
    • Replies: 2
    • Views: 234
    03-26-2014, 07:12 AM Go to last post
  33. multinomial distribution and degrees of freedom

    Hi I have some data from a housing survey (sample size 13,500) and have found that the proportion of privately rented housing is slightly higher...

    Started by hughm‎, 03-25-2014 03:53 AM
    degreees of freedom, multinomial, significance test, t-distribution
    • Replies: 2
    • Views: 165
    03-26-2014, 05:17 AM Go to last post
  34. Post Correlation coefficient repeated measures

    Hi Everyone, I would like to measure the correlation between two quantitative variables. These variables measure the same thing but are obtained...

    Started by AkaKiwi‎, 03-23-2014 06:30 AM
    • Replies: 5
    • Views: 196
    03-26-2014, 04:17 AM Go to last post
  35. Inference and Interpretation for Standard Deviation Result Obtained

    I'm working with seed germination studies. I calculated Standard deviation for weekly germination and i got the Standard deviation value as 14.56....

    Started by Mohamed Faisal‎, 03-24-2014 02:15 PM
    • Replies: 1
    • Views: 107
    03-26-2014, 12:26 AM Go to last post
  36. Literature on convergence of Bregman divergences

    Hi, as the title indicates, I am looking for some literature related to convergence properties of Bregman divergences. Generally speaking, I am...

    Started by gumbel‎, 03-17-2014 11:11 AM
    • Replies: 2
    • Views: 145
    03-24-2014, 05:28 AM Go to last post
  37. control vs exposed

    so i have 2 diffferent sample wherein the 1st sample is control and the 2nd sample is exposed to technology i.e in terms of exposure to Mobile...

    Started by chirax‎, 03-24-2014 02:32 AM
    • Replies: 0
    • Views: 137
    03-24-2014, 02:32 AM Go to last post
  38. Performing oneway ANOVA with a linear monotonic contrast in SPSS from {n, mean, sd}

    Does anyone know how I go about performing a oneway ANOVA with a linear monotonic contrast when I only have summary data for each group (i.e. n,...

    Started by sethnk1234‎, 03-21-2014 03:57 PM
    anova, contrast analysis, spss
    • Replies: 0
    • Views: 161
    03-21-2014, 03:57 PM Go to last post
  39. Intraclass correlations

    I am doing a study to investigate the interrater reliability of a rating scale. I solicited 100 teachers to complete a rating scale on a child and...

    Started by drgill‎, 03-21-2014 01:29 PM
    intraclass, intraclass correlation, intraclass interpretation
    • Replies: 0
    • Views: 133
    03-21-2014, 01:29 PM Go to last post
  40. Cell count-which test to choose when comparing two groups to a control?

    Hello dear members of the Talkstats forum, In my research we counted algae cells with the counting chamber.N=8.We have the means of these three...

    Started by cos85‎, 03-21-2014 01:07 PM
    microbiology groups
    • Replies: 0
    • Views: 145
    03-21-2014, 01:07 PM Go to last post
  41. Correlations - Homogeneity of Variance

    Hi, Please help, I'm in the middle of a research project,under pressure, and I just can't think straight. I'm using SPSS. I have data which is...

    Started by SunnyFriday‎, 03-21-2014 07:49 AM
    • Replies: 0
    • Views: 132
    03-21-2014, 07:49 AM Go to last post
  42. Correlation interpretation: when to use "is related"?

    If the selling of ice cream was found correlated (0.4-0.6) to the temperature, can we conclude that ice cream selling "is related" to the...

    Started by John.Thomas‎, 03-19-2014 10:03 AM
    correlation, interpretation
    • Replies: 0
    • Views: 138
    03-19-2014, 10:03 AM Go to last post
  43. 3-Way ANOVA Woes (Levene's Test)

    Hi all, I'm doing a study on the amount of a protein found in a brain region after different manipulations. Exercise is thought to increase it, a...

    Started by AndrewLoG‎, 03-18-2014 07:18 PM
    • Replies: 0
    • Views: 166
    03-18-2014, 07:18 PM Go to last post
  44. What counts as a high dimensional problem in sequential importance sampling?

    I've read a lot about how sequential importance sampling isn't useful in high dimensions, but not what is considered high. The reason for me...

    Started by JJstar‎, 03-18-2014 12:11 PM
    mcmc
    • Replies: 0
    • Views: 92
    03-18-2014, 12:11 PM Go to last post
  45. Quick Chi-Square Question

    Hi all, I'm familiar with chi-square and have used it for a while at work. Just wondering something... When calculating the Chi-Square for each...

    Started by Chris Brunskill‎, 09-02-2011 08:51 AM
    • Replies: 4
    • Views: 881
    03-18-2014, 09:23 AM Go to last post
  46. Retired Statistician Selling My SAGE Statistical Reference Book Series - 25 Books !!

    Dear Fellow Statisticians, I hope this will be considered and appropriate post by the Admins. I'm a retired life-long Statistician and...

    Started by sullivan594‎, 03-16-2014 06:06 PM
    • Replies: 1
    • Views: 233
    03-16-2014, 09:20 PM Go to last post
  47. x-12-arima - Which model to choose ?

    Hi I'm working with some data. But it isn't a long series. In fact, it has 47obs. The data is on levels. So, i worked with the multiplicative...

    Started by jfca283‎, 03-14-2014 03:16 PM
    • Replies: 0
    • Views: 160
    03-14-2014, 03:16 PM Go to last post
  48. Proof of the day

    In this thread we post one (or more if you can't wait) proof a day. I'll start by proving the that V=\sigma^2(X'X)^{-1} in the linear...

    Started by Englund‎, 01-18-2014 03:56 AM
    • Replies: 9
    • Views: 494
    03-14-2014, 08:21 AM Go to last post
  49. Low or high correlation?

    What does it mean when Pearson correlation gives a value of 0.7-0.8, while spearman correlation gives a value from 0.3-0.4? Pearson reports high...

    Started by John.Thomas‎, 03-12-2014 03:45 PM
    pearson correlation, spearman
    • Replies: 7
    • Views: 231
    03-13-2014, 09:16 AM Go to last post
  50. N needed comparing groups in linear regression with many covariates-do I have to few?

    I have two easy, but for me at this point rather devastating, questions I was hoping for one kind hearted or bright individual,or two, to reply on. ...

    Started by kristian‎, 03-11-2014 12:22 PM
    comparing means, dummy variable, linear regression, small sample problem, small sample size
    • Replies: 2
    • Views: 190
    03-13-2014, 05:31 AM Go to last post
  51. Smile Which statistical test is better?

    Hello Everyone, I am pondering upon which statistical test to use for my project. I would appreciate any input/advice from anyone. I am using...

    Started by Methys‎, 03-12-2014 12:11 PM
    • Replies: 0
    • Views: 176
    03-12-2014, 12:11 PM Go to last post
  52. Subspace clustering

    Hello, Could you recommed me book about subspace clustering?

    Started by Aretse‎, 03-12-2014 04:42 AM
    cluster analysis, data minig
    • Replies: 0
    • Views: 82
    03-12-2014, 04:42 AM Go to last post
  53. Red face Which test to use and Bonferroni - Helping a Beginner

    Hello all, I am looking for some help with the statistical analysis part of my masters project. The course is a practical one with very little by...

    Started by bbk‎, 03-11-2014 03:23 PM
    • Replies: 2
    • Views: 235
    03-11-2014, 05:11 PM Go to last post
  54. Question 1 observation for control group & 3 obs for experimental group

    Hello, My background in statistics is quite limited, so I'm searching for help in order to choose which test I should use for my research. I am...

    Started by Pernelle‎, 03-05-2014 08:32 AM
    anova observations
    • Replies: 6
    • Views: 197
    03-11-2014, 03:05 PM Go to last post
  55. Weights in Inferential Tests?

    Hello, I've conducted a survey and noticed that males were under-represented. To "fix" this, I weighted sex to reflect the true proportions in the...

    Started by JoanF‎, 03-04-2014 07:15 PM
    inferential statistics, weights
    • Replies: 2
    • Views: 173
    03-11-2014, 12:36 PM Go to last post
  56. Paired T-Test Debate

    Hey guys! I was having a little debate with a doctor on her study about which statistical test to use. I was always under the assumption that a...

    Started by gene2420‎, 03-06-2014 07:35 PM
    2 Pages
    1 2
    • Replies: 26
    • Views: 651
    03-10-2014, 04:12 PM Go to last post
  57. matched pairs VS complete randomization - correspondence test housing market

    I work in experimental economics, labor and housing market. I am trying to answer the following question: why do researchers use matched pairs of...

    Started by lukeskywalker84‎, 03-08-2014 08:32 AM
    experiment design, houses, matched pairs, randomization
    • Replies: 0
    • Views: 166
    03-08-2014, 08:32 AM Go to last post
  58. Question Cross-estimating the independent variables to exclude outliers

    I am working on a dataset where some of the independent observations have measurement issues (i.e. mixed feet and metric). I'm considering...

    Started by erikstatman‎, 03-08-2014 07:49 AM
    modeling, outlier, regresion
    • Replies: 0
    • Views: 120
    03-08-2014, 07:49 AM Go to last post
  59. Poll Poll: Assumptions independent variables when just want to control/adjust for - less strict?

    Is it true that when one just want to control for/adjust for in linear og logistic regression models, the variables one wants to control for/adjust...

    Started by kristian‎, 03-02-2014 12:58 AM
    adjustment, confounders, control for, linear regression, logistic regression
    • Replies: 9
    • Views: 244
    03-08-2014, 04:48 AM Go to last post
  60. Linear regression using compositional data as independent variables

    I have a set of ratios that the sum results in 100% (compositional data in other words). These 7 variables need to be implemented in a linear...

    Started by micdhack‎, 03-24-2013 11:49 AM
    • Replies: 2
    • Views: 541
    03-07-2014, 11:04 AM Go to last post

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