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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: 197,336
    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: 67,072
    09-30-2005, 09:44 AM Go to last post
  1. Reason of using Peason distribution over Normal distribution?

    Dear all, (Sorry about the typo, it is "Pearson" Not "Peason".) I am running an analysis of a manufacturing process flow. The measurement...

    Started by Lawrence‎, 04-22-2014 05:08 AM
    • Replies: 1
    • Views: 1,046
    04-22-2014, 08:09 AM Go to last post
  2. Correlation Across Time Help?

    Hi I'm a bit lost as to how to calculate the correlation between two groups of numbers across time. I'd like to see if one group, taken from the...

    Started by bataille‎, 04-22-2014 05:46 AM
    correlation, difference, significance, time
    • Replies: 1
    • Views: 1,372
    04-22-2014, 08:03 AM Go to last post
  3. SPSS help

    Hi Can you help me with spss? where should i enter the pretest scores and post test scores of a control group and an experimental group?

    Started by blueblooded‎, 04-22-2014 01:17 AM
    • Replies: 1
    • Views: 1,411
    04-22-2014, 04:23 AM Go to last post
  4. No margins for chi-squared test with multiple categories?

    This post has been deleted

    Started by sevenof9‎, 04-21-2014 09:57 PM
    chi-square, margin of error, multiple comparisons
    • Replies: 0
    • Views: 1,431
    04-21-2014, 09:57 PM Go to last post
  5. 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: 7
    • Views: 6,066
    04-21-2014, 09:02 PM Go to last post
  6. Which statistic should be used for each problem?

    Hi I have a control group and an experimental group. I gave each a pretest and a post test. Which statistic should I use to get the results? Is it...

    Started by blueblooded‎, 04-21-2014 10:06 AM
    • Replies: 4
    • Views: 1,830
    04-21-2014, 03:24 PM Go to last post
  7. Solving an ANOVA

    My online instructor's question wasn't very clear to me. It reads : Math is taught with a calculator and without a graphing calculator and by team...

    Started by louisjxn‎, 04-21-2014 02:25 PM
    • Replies: 0
    • Views: 1,473
    04-21-2014, 02:25 PM Go to last post
  8. How to work out min & max from values for range, median and mode

    Hi, I was wondering if you could help me with the following (very basic) stats problem. How do I find out the minimum and maximum when I don't...

    Started by zonkil15‎, 04-21-2014 05:02 AM
    • Replies: 6
    • Views: 1,618
    04-21-2014, 02:20 PM Go to last post
  9. 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: 2
    • Views: 1,482
    04-21-2014, 08:29 AM Go to last post
  10. Delta method

    I was wondering if anybody can help me as I've been stuck on this problem for ages and my attempts seem to all be incorrect so far. I have four...

    Started by rainbow34‎, 04-21-2014 04:47 AM
    delta method, standard error, statisics
    • Replies: 5
    • Views: 1,521
    04-21-2014, 07:32 AM Go to last post
  11. Regarding Metanalysis

    Dear Colleagues Is it possible to conduct a metanalysis from case series (meaning non controlled studies)? the single arm of the studies will...

    Started by drmohamedbekheit‎, 04-21-2014 05:16 AM
    • Replies: 0
    • Views: 1,228
    04-21-2014, 05:16 AM Go to last post
  12. 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, 04-20-2014 08:50 AM
    anova, confidence interval, gender, statistics, tests of significance
    • Replies: 0
    • Views: 1,454
    04-20-2014, 08:50 AM Go to last post
  13. need formula can youn help?

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

    Started by mathprof‎, 04-20-2014 06:48 AM
    sample, size
    • Replies: 0
    • Views: 1,264
    04-20-2014, 06:48 AM Go to last post
  14. 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, 04-19-2014 02:32 PM
    • Replies: 2
    • Views: 1,839
    04-20-2014, 01:17 AM Go to last post
  15. 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, 04-19-2014 11:51 PM
    • Replies: 0
    • Views: 1,081
    04-19-2014, 11:51 PM Go to last post
  16. 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, 04-19-2014 09:19 PM
    z ratio
    • Replies: 0
    • Views: 1,126
    04-19-2014, 09:19 PM Go to last post
  17. 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: 1,511
    04-19-2014, 07:38 AM Go to last post
  18. 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: 2,133
    04-18-2014, 09:11 PM Go to last post
  19. 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: 1,250
    04-18-2014, 12:00 PM Go to last post
  20. 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: 1,096
    04-18-2014, 08:19 AM Go to last post
  21. 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: 1,139
    04-18-2014, 04:44 AM Go to last post
  22. 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: 1,152
    04-18-2014, 12:56 AM Go to last post
  23. 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: 1,062
    04-17-2014, 09:42 PM Go to last post
  24. 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: 1,189
    04-17-2014, 09:34 PM Go to last post
  25. 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: 1,043
    04-17-2014, 03:15 PM Go to last post
  26. 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: 2,665
    04-17-2014, 03:08 PM Go to last post
  27. 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: 7,724
    04-17-2014, 07:40 AM Go to last post
  28. 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: 1,227
    04-17-2014, 04:36 AM Go to last post
  29. 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: 1,822
    04-17-2014, 04:20 AM Go to last post
  30. 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: 2,888
    04-16-2014, 05:10 PM Go to last post
  31. 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: 9,058
    04-16-2014, 03:11 PM Go to last post
  32. 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: 1,429
    04-16-2014, 02:38 PM Go to last post
  33. 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: 3,139
    04-16-2014, 01:44 PM Go to last post
  34. 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: 4,036
    04-16-2014, 08:58 AM Go to last post
  35. 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: 2,750
    04-16-2014, 02:49 AM Go to last post
  36. 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: 1,592
    04-16-2014, 01:31 AM Go to last post
  37. 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: 1,253
    04-15-2014, 10:58 PM Go to last post
  38. 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: 2,517
    04-15-2014, 10:54 PM Go to last post
  39. 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: 1,208
    04-15-2014, 09:43 PM Go to last post
  40. 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: 2,750
    04-15-2014, 09:24 PM Go to last post
  41. 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: 1,296
    04-15-2014, 08:43 PM Go to last post
  42. 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: 3,277
    04-15-2014, 03:16 PM Go to last post
  43. 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: 1,046
    04-15-2014, 10:24 AM Go to last post
  44. 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: 1,062
    04-15-2014, 08:38 AM Go to last post
  45. 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: 2,123
    04-15-2014, 08:19 AM Go to last post
  46. 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: 1,173
    04-15-2014, 02:29 AM Go to last post
  47. 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: 1,672
    04-14-2014, 10:20 PM Go to last post
  48. 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: 1,174
    04-14-2014, 05:37 PM Go to last post
  49. 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: 1,393
    04-14-2014, 01:49 PM Go to last post
  50. 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: 3,124
    04-13-2014, 11:57 PM Go to last post
  51. 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: 1,849
    04-13-2014, 01:59 PM Go to last post
  52. 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: 1,278
    04-13-2014, 07:34 AM Go to last post
  53. 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: 1,323
    04-13-2014, 05:15 AM Go to last post
  54. [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: 5,124
    04-13-2014, 04:56 AM Go to last post
  55. 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: 2,165
    04-13-2014, 04:21 AM Go to last post
  56. 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: 2,655
    04-12-2014, 04:50 PM Go to last post
  57. 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: 2,420
    04-11-2014, 02:10 PM Go to last post
  58. 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: 1,566
    04-11-2014, 01:16 PM Go to last post
  59. 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: 1,024
    04-11-2014, 01:11 PM Go to last post
  60. [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: 1,663
    04-11-2014, 04:32 AM Go to last post

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