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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: 0
    • Views: 48,563
    11-27-2010, 11:13 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: 23,576
    09-30-2005, 09:44 AM Go to last post
  1. Question Help with ANOVA Analysis of Data

    I need to compute: The sum of squares associated with sex from the ANOVA table; Create histograms of the data used in the ANOVA for each level of...

    Started by bulgarianprincess‎, Today 08:50 AM
    anova, confidence interval, gender, statistics, tests of significance
    • Replies: 0
    • Views: 42
    Today, 08:50 AM Go to last post
  2. need formula can youn help?

    find minimum sample size P(s2/sigma2 <1.75) >.95

    Started by mathprof‎, Today 06:48 AM
    sample, size
    • Replies: 0
    • Views: 46
    Today, 06:48 AM Go to last post
  3. how do i correlate these variables?

    I am seeking make a correlation between two variables, however i am having a difficult time in choosing what to do. my report involves the setting up...

    Started by kathmustdie‎, Yesterday 02:32 PM
    • Replies: 2
    • Views: 131
    Today, 01:17 AM Go to last post
  4. Question UMP tests, composite-composite

    Hello, I am struggling a little with going from the simple-simple most powerful test, to the composite-composite UMP test. My book had an example,...

    Started by Tarly‎, Yesterday 11:51 PM
    • Replies: 0
    • Views: 119
    Yesterday, 11:51 PM Go to last post
  5. observed z ratio

    When null hypothesis is population mean 1 = population mean 2 given population s variances and sample sizes and sample means I calculate the SE...

    Started by mathprof‎, Yesterday 09:19 PM
    z ratio
    • Replies: 0
    • Views: 108
    Yesterday, 09:19 PM Go to last post
  6. Statement of significance

    Is saying that β1= β2=.= β11=0 (ie: through an F-test) equivalent to saying that "none of the coefficients are significant" (p>0.05 in the STATA...

    Started by ineedhelpineedhelp‎, Yesterday 12:07 PM
    • Replies: 3
    • Views: 163
    Yesterday, 04:32 PM Go to last post
  7. Fantasy Sports Contest - basic stats question.

    Hi, this is a very newb-ish stats question so please forgive me. Background: I am playing fantasy sports contests and trying to figure out how...

    Started by stats111‎, 04-18-2014 02:59 PM
    • Replies: 1
    • Views: 152
    Yesterday, 03:18 PM Go to last post
  8. Logistic Regression

    Hello, I am evaluating a scoring system to predict success of a particular type of cardiac surgery. This involves 5 predictor variables, these...

    Started by GeorgeHill‎, 04-18-2014 03:10 PM
    • Replies: 1
    • Views: 162
    Yesterday, 07:38 AM Go to last post
  9. Senior project statistics

    Hello all, I am currently working on a senior project for a soil science degree and had some questions about my project statistics. My group is...

    Started by ashmgee‎, 04-07-2014 04:02 PM
    • Replies: 8
    • Views: 333
    04-18-2014, 09:11 PM Go to last post
  10. Help.

    How to write conjecture ? How to use a graphical method? Can anyone help me?

    Started by jiasyuen‎, 04-18-2014 11:04 AM
    • Replies: 2
    • Views: 69
    04-18-2014, 12:00 PM Go to last post
  11. Interpreting r for non-significant results

    Hi, Quick question about the interpretation of effect sizes. I was taught that (in line with APA formatting) you should always report an...

    Started by coffeee‎, 04-17-2014 11:57 PM
    • Replies: 6
    • Views: 174
    04-18-2014, 10:16 AM Go to last post
  12. Using bootstrap to calculate the sample size for a median ?

    hi, I have a small(ish) sample of 31 data points from a highly right skewed distribution and need to determine the sample size to estimate the...

    Started by rogojel‎, 04-17-2014 05:11 AM
    bootstrap, sample size, skewed data
    • Replies: 7
    • Views: 234
    04-18-2014, 09:43 AM Go to last post
  13. Standard error of estimates

    I have the standard error of P (which is an estimator), and W is a constant, and now have the following equation E=W*sqrt(p) to obtain E as the...

    Started by phdmama‎, 04-18-2014 04:35 AM
    estimate, standard error
    • Replies: 3
    • Views: 144
    04-18-2014, 08:19 AM Go to last post
  14. Which test to use?

    I have 3 groups-A, B, C. No. of respondents in each group A-120, B-120, C-30. Each group has an index about a topic. There are 14 such topics. ...

    Started by BALA M‎, 04-17-2014 05:42 AM
    anova, statistical test
    • Replies: 1
    • Views: 209
    04-18-2014, 04:44 AM Go to last post
  15. Making Statistical Inferences Based on Historical H.S. Graduation/Retention Data

    Thank you in advance for your help with this matter, I greatly appreciate your assistance. I work at an alternative high school in Oakland, CA and...

    Started by KKell88‎, 04-18-2014 12:56 AM
    • Replies: 0
    • Views: 219
    04-18-2014, 12:56 AM Go to last post
  16. Calculating Absolute rate reductions with Count Data

    Hello everyone, I'm analyzing count data in stata using negative binomial regression because of overdispersion. I'm reporting incident rate ratios...

    Started by simonja‎, 04-17-2014 09:42 PM
    absolute rate reduction, count data
    • Replies: 0
    • Views: 148
    04-17-2014, 09:42 PM Go to last post
  17. Help with weighted average

    I was given a data set as follows (sample) is to do with processing time of forms: 1 day am***** 1 day pm ***** 2 day am * * *...

    Started by w4k1ng‎, 04-17-2014 09:34 PM
    • Replies: 0
    • Views: 97
    04-17-2014, 09:34 PM Go to last post
  18. Bio Log Survival Data Normalization Question

    I have been attempting to compare two sets of data points in log form utilizing a student t-test difference of means test and have been running into...

    Started by NeilK‎, 04-17-2014 03:15 PM
    • Replies: 0
    • Views: 181
    04-17-2014, 03:15 PM Go to last post
  19. Sample size for small proportions

    I am trying to determine what sample size for proportions I need. I know that historically, p has been small (way less than 0.5). If I use the...

    Started by hhveluj‎, 04-17-2014 09:47 AM
    sample size
    • Replies: 2
    • Views: 181
    04-17-2014, 03:08 PM Go to last post
  20. Polynom/spline/function for "upper and lower limit" ( 2 SD)

    I have some hemoglobin values from children aged 0-18 years. I'd like to produce reference ranges for hemoglobin based on these values. Let's say I...

    Started by danlewis‎, 04-16-2014 04:46 AM
    • Replies: 3
    • Views: 122
    04-17-2014, 07:40 AM Go to last post
  21. Create bell curve with a discrete variable

    Hello everyone, I like stats but I must warn you that I am far from an expert so please forgive me if my question is a bit basic :). My issue...

    Started by ClementCrit‎, 04-17-2014 03:41 AM
    bell-shaped curve, discrete, excel, gauss
    • Replies: 1
    • Views: 98
    04-17-2014, 04:36 AM Go to last post
  22. Standardizing ranks?

    Hi guys! I'm currently working on a project a bit outside my comfort zone and I'm kinda stuck. I'm supposed to do correlations and multiple...

    Started by Slasktratt‎, 04-17-2014 04:20 AM
    • Replies: 0
    • Views: 139
    04-17-2014, 04:20 AM Go to last post
  23. interpret sin and cos terms

    Im just looking for a reference that will help me understand how to interpret a cos and sin function in a model such as: ...

    Started by bugman‎, 04-16-2014 07:05 PM
    • Replies: 5
    • Views: 192
    04-16-2014, 11:11 PM Go to last post
  24. Normal Probability Plot of Effects

    Hi, I am trying to estimate the effects of a 2^3 factorial design with three duplicates. I am trying to create a normal probability plot of...

    Started by S-C-3-1-3‎, 04-15-2014 12:59 AM
    • Replies: 6
    • Views: 162
    04-16-2014, 05:10 PM Go to last post
  25. Confidence Interval Help

    Hello :) I have a question in my homework that states: "Lorraine computed a confidence interval for μ based on a sample size of 41. Since she...

    Started by Gina77‎, 04-16-2014 10:46 AM
    • Replies: 3
    • Views: 220
    04-16-2014, 03:11 PM Go to last post
  26. Interpreting confidence intervals

    Hi I got a 95% confidence interval ranging from .0000 to .0001 on SPSS. I know the rule that if a CI doesn't go through 0 then the p value will be...

    Started by cval‎, 04-16-2014 11:03 AM
    • Replies: 2
    • Views: 139
    04-16-2014, 02:38 PM Go to last post
  27. Cohens D and Statistical Significance

    I've read that a low scoring Cohens D can be seen to undermine a significant result, however is the opposite true? Can a high Cohens D undermine a...

    Started by bataille‎, 04-15-2014 02:21 PM
    • Replies: 10
    • Views: 251
    04-16-2014, 01:44 PM Go to last post
  28. cut-off for CV (coeff. of Variation)

    What is considered a cutoff for Coefficient of Variation as too volatile, mainly speaking for normal distributions? Thanks

    Started by podarum‎, 04-16-2014 08:58 AM
    • Replies: 0
    • Views: 76
    04-16-2014, 08:58 AM Go to last post
  29. Best Way to Present Non-Normally Distributed Data

    Hi, I wondered if anyone could give me advice on the best way to present two sets of continuous (not normally distributed) data. Would median ...

    Started by arthur‎, 04-15-2014 02:23 PM
    • Replies: 3
    • Views: 269
    04-16-2014, 02:49 AM Go to last post
  30. Am I correctly generating my p-values?

    Hi, I am a doctor in the UK, and did a (very) little bit of undergraduate statistics >10 years ago. I am preparing an abstract for submission for...

    Started by richard.fisher‎, 04-15-2014 02:41 AM
    • Replies: 4
    • Views: 191
    04-16-2014, 01:31 AM Go to last post
  31. 3 Factors (2 Fixed, 1 Random) - Selecting and applying the appropriate model

    This is related to a homework question. I've had trouble finding info on models with 2 fixed and 1 random factor. Any input guiding me in the right...

    Started by boundless constraint‎, 04-15-2014 05:35 PM
    • Replies: 1
    • Views: 163
    04-15-2014, 10:58 PM Go to last post
  32. Confounding Variables and Comparing Interactions

    Hi, I am working on an assignment and am having difficulties. An experiment was performed to improve the yield of a chemical process. Four...

    Started by S-C-3-1-3‎, 04-15-2014 10:54 PM
    • Replies: 0
    • Views: 162
    04-15-2014, 10:54 PM Go to last post
  33. Comparing one rater with a group of raters

    Hi all, I'm working through a research project, and am looking for advice. Students were asked to work through a simulated clinical scenario and...

    Started by Cheeseboy‎, 04-15-2014 09:43 PM
    correlation, interrater reliability, krippendorff
    • Replies: 0
    • Views: 69
    04-15-2014, 09:43 PM Go to last post
  34. Significance level help

    Hey guys, i have this homework here : http://image.noelshack.com/fichiers/2014/16/1397585977-work.png So tell me if i'm wrong : H o > 25 H...

    Started by dessailly11‎, 04-15-2014 01:23 PM
    • Replies: 2
    • Views: 127
    04-15-2014, 09:24 PM Go to last post
  35. Mixed Model F-Test

    A (Random-4 Levels) B (Fixed-5 Levels) C (Random-3 Levels, Nested in B) reps = 6 Experimental Units per treatment combination of (ABC, total...

    Started by simplemts‎, 04-15-2014 08:43 PM
    • Replies: 0
    • Views: 166
    04-15-2014, 08:43 PM Go to last post
  36. Determining defining contrast subgroup from design matrix

    I have the following design for studying five variables in eight runs in four blocks of size two (k=5, p=2, q=2) \begin{tabular}{rrlllllll} ...

    Started by APOCooter‎, 04-15-2014 03:13 PM
    • Replies: 1
    • Views: 86
    04-15-2014, 03:16 PM Go to last post
  37. mixed designs and repeated measures

    I want to see the effect of 3 treatment types on two dependent variables, heart beat and sweat produced. Dependent variables are measured at three...

    Started by hello_kitty2‎, 04-15-2014 10:24 AM
    mixed designs, repeated measures
    • Replies: 0
    • Views: 122
    04-15-2014, 10:24 AM Go to last post
  38. T-Test Help

    Hi I am totally new to stats and finding it very difficult. I was wondering whether or not anyone could help me understand which T-Test to use to...

    Started by bataille‎, 04-15-2014 08:38 AM
    spss, statistics, t-test
    • Replies: 0
    • Views: 171
    04-15-2014, 08:38 AM Go to last post
  39. Computing the test statistic: Not sure which Formula I need

    Not sure which formula to use... A Health and Fitness company would like to determine if a new product improves cardiovascular fitness. A sample...

    Started by collegework‎, 04-15-2014 08:19 AM
    formula, paired data, statistics, stats
    • Replies: 0
    • Views: 169
    04-15-2014, 08:19 AM Go to last post
  40. Multi-level analysis? Advice please

    I would greatly appreciate some statistics advice on the most appropriate test to answer our research questions. The aim of the research is to...

    Started by Nicolab870‎, 04-15-2014 02:29 AM
    • Replies: 0
    • Views: 115
    04-15-2014, 02:29 AM Go to last post
  41. Statistics Help

    I haven't done anything statistics related in quite a while. I am helping a friend with some hw and I am stumped on what I am sure is a simple...

    Started by plsc328‎, 04-14-2014 10:20 PM
    • Replies: 0
    • Views: 166
    04-14-2014, 10:20 PM Go to last post
  42. Appropriate statistical test for RIFLE Criteria

    I need help choosing the appropriate statistical test for my primary endpoint of my resident research project and thought I'd join a forum to help...

    Started by screwedupsmitty‎, 04-13-2014 07:00 PM
    • Replies: 1
    • Views: 204
    04-14-2014, 05:37 PM Go to last post
  43. Unsure as to what test to use to analyse my data.

    Hi there, My dissertation is due in a couple of weeks and I would really appreciate some help. My investigation involves analysing the ability of...

    Started by tomrush14‎, 04-14-2014 01:49 PM
    • Replies: 0
    • Views: 196
    04-14-2014, 01:49 PM Go to last post
  44. Constrain a value to be between -1 and 1

    I asked this question a while back and never found an answer. After reading my multilevel book I realized the answer from the logit link...

    Started by trinker‎, 04-12-2014 07:52 PM
    2 Pages
    1 2
    constrain, transform
    • Replies: 16
    • Views: 281
    04-13-2014, 11:57 PM Go to last post
  45. Statistical test interpretation

    Hello, Firstly, sorry if my english is bad, I'm French. I wondered if I understood well how to interpret the result of a test, such as the...

    Started by JWheat‎, 04-13-2014 11:08 AM
    student, test
    • Replies: 2
    • Views: 285
    04-13-2014, 01:59 PM Go to last post
  46. Expected and observed frequencies- is chi squared goodness of fit suitable?

    0 0 0 0 0 0 0 0 0 0 0

    Started by DGUOC‎, 04-13-2014 07:34 AM
    • Replies: 0
    • Views: 210
    04-13-2014, 07:34 AM Go to last post
  47. Centering predictors in regression analyses and geometrically transforming means

    Hi there, I'm confused about which variables to center in a regression analysis. In block 1, I have sex and 2 continuous variables, which are...

    Started by Joanna-jo‎, 04-13-2014 05:15 AM
    • Replies: 0
    • Views: 122
    04-13-2014, 05:15 AM Go to last post
  48. [R lme function] Comparing curves in longitudinal data (growth curves)

    I think my problem is best solved by the use of multi-level models. However, Id like to confirm if what Im doing is right, and the use of the...

    Started by RodGob‎, 04-13-2014 04:56 AM
    • Replies: 0
    • Views: 76
    04-13-2014, 04:56 AM Go to last post
  49. Multilevel Analysis

    Hi I am currently working on a research project that involves PhD students. The data is hierarchical as the students are nested within PhD...

    Started by Danfac‎, 04-12-2014 04:09 AM
    • Replies: 2
    • Views: 231
    04-13-2014, 04:21 AM Go to last post
  50. Likelihood ratio test for two Poisson variables

    I have two variables: X1 ~ Poi (λ1) and X2 ~ Poi (λ2), with n1 = n2. How can I use a likelihood ratio test to test the null hypothesis H0: λ1 = λ2?

    Started by Holmes‎, 04-12-2014 04:42 PM
    likelihood ratio test, poisson distribution
    • Replies: 1
    • Views: 146
    04-12-2014, 04:50 PM Go to last post
  51. Confidence Interval and Sample Sizes for Proportions

    Having trouble with a specific problem. A federal report stated that 88% of children under age of 18 were covered by health insurance in 2000. How...

    Started by jcabali617‎, 04-10-2014 09:50 PM
    • Replies: 3
    • Views: 244
    04-11-2014, 02:10 PM Go to last post
  52. statistical significance of sequence

    Hi, Suppose I have a set of sequences of length n with symbols from an alphabet A = {a1, a2, ..., an} A particular sequence may appear multiple...

    Started by morfys‎, 04-10-2014 06:53 PM
    sequence, statistical significance
    • Replies: 2
    • Views: 169
    04-11-2014, 01:16 PM Go to last post
  53. research help: correlation between two non numerical variables. Which Test ?

    I am Optometrist studying for a diploma in school vision. My research involves testing Taekwondo and Dance students. I want to establish whether...

    Started by imran‎, 04-11-2014 12:09 PM
    • Replies: 1
    • Views: 268
    04-11-2014, 01:11 PM Go to last post
  54. correlate two time series

    Hi there, I would like to compare the two short time series to see how similar they are, but I have no idea how to do it, but there is some...

    Started by ivn‎, 04-10-2014 03:16 PM
    • Replies: 5
    • Views: 191
    04-11-2014, 09:21 AM Go to last post
  55. [SPSS] Comparison to homogeneous distribution.

    Hello. This is my first post here, please forgive any mistakes. I am designing the statistics for a project. The aim is to compare samples...

    Started by Kututo‎, 04-11-2014 04:32 AM
    • Replies: 0
    • Views: 219
    04-11-2014, 04:32 AM Go to last post
  56. Simple Slopes inconsistency

    Hi everyone, Ran into a puzzling issue today and I'm hoping someone can provide some insight. I think I've figured out how to conduct the analysis,...

    Started by jnian‎, 04-10-2014 09:05 PM
    • Replies: 0
    • Views: 163
    04-10-2014, 09:05 PM Go to last post
  57. Question Verify That I'm conducting the correct tests?

    Both problems relate to this regression model: y = b0 + B1*(x1) + B2*(x2) + e a. Does x2 have influence on y? Test: Ho: B2 = 0 Ha: B2...

    Started by user2924‎, 04-10-2014 07:40 PM
    hypothesis testing, relationships
    • Replies: 0
    • Views: 201
    04-10-2014, 07:40 PM Go to last post
  58. Statistical Test for differences Across time Between Independent Groups

    Hello everyone. I am trying to determine if there is a statistical model that would allow someone to test for differences between two different...

    Started by Anotherdream‎, 04-09-2014 03:37 PM
    • Replies: 6
    • Views: 279
    04-10-2014, 07:04 PM Go to last post
  59. correlating many time series to find functional pairs

    Hi there, I'm a neuroscientist in deep water, trying to do things that aren't standard in my field. I have a strong feeling there are established...

    Started by BrainDr‎, 04-10-2014 06:42 PM
    correlation matrix, correlations; time series, multivariate tests, neural networks, weighted data
    • Replies: 0
    • Views: 83
    04-10-2014, 06:42 PM Go to last post
  60. Trouble with determining the probability of exceding some extreme value

    I fitted a normal distribution to my dataset of N=200 lengths. The chi-square test shows it's a pretty good match. I intended to use this normal...

    Started by maq‎, 04-07-2014 09:38 AM
    • Replies: 10
    • Views: 340
    04-10-2014, 12:10 PM Go to last post

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