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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: 196,807
    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: 66,786
    09-30-2005, 09:44 AM Go to last post
  1. Factors influencing a nominal variable

    Thank you in advance for your assistance in this! I have a dataset set up with a variable, agreement (coded 0) or disagreement (1), for each case...

    Started by wnjiang‎, 02-18-2015 09:51 AM
    agreement, predictor, regression
    • Replies: 0
    • Views: 881
    02-18-2015, 09:51 AM Go to last post
  2. 3 values ordinal variable: Mann-Whitney or Chi-squared?

    Hello, I have an ordinal variable which assumes only 3 values. I need to do a comparison between 2 treatments. I used Mann-Whitney test, since...

    Started by estrucida‎, 02-10-2015 05:40 AM
    chi square, mann-whitney, ordinal data, wilcoxon rank sum test
    • Replies: 9
    • Views: 2,271
    02-18-2015, 05:46 AM Go to last post
  3. How to find the t-value and probability

    Given that the parameter estimate is -5.0 and the STD. error is 1.443 how do I find the t-value and probability? The other information in the chart...

    Started by satenia‎, 02-16-2015 10:32 PM
    • Replies: 2
    • Views: 1,278
    02-17-2015, 02:57 PM Go to last post
  4. One predictor (interval) and multiple response variables (interval) - testing a model

    Hi, I have one variable measured on a interval (Likert 5-point scale) that is hypothesized to be a predictor of several other variables (also...

    Started by liquidmodernity‎, 02-17-2015 06:10 AM
    • Replies: 4
    • Views: 2,298
    02-17-2015, 07:51 AM Go to last post
  5. signs changes

    Hi, I am working on a model that should be in terms with what I observe. Therefore I am adding variables that in theory should be significant. But...

    Started by bodesmiller‎, 02-16-2015 02:03 PM
    • Replies: 1
    • Views: 1,345
    02-16-2015, 04:03 PM Go to last post
  6. Please help me out

    Hello house..........i appreciate your posts all on this forum. I have a data analysis that has been giving me challenges. i tried to analyse it but...

    Started by molo007‎, 02-10-2015 01:39 PM
    • Replies: 2
    • Views: 1,570
    02-16-2015, 12:37 PM Go to last post
  7. Test how accurate my table is?

    Hi. I have a table of sportsmen with stats corresponding to each. One stat is the probability of each of them winning. How could I test my table...

    Started by batman98‎, 02-16-2015 10:41 AM
    table outcome predict
    • Replies: 1
    • Views: 1,438
    02-16-2015, 11:16 AM Go to last post
  8. Two way anova

    Dear All, I want to perform two way anova for the data set attached <Book 1>. I have also attached 2 PDF files where they have used two way anova,...

    Started by Pradeep25‎, 02-16-2015 09:25 AM
    • Replies: 0
    • Views: 1,279
    02-16-2015, 09:25 AM Go to last post
  9. goal: why cumulative % exceeds 1 when I do principal axis factoring in STATA

    Hi, I surfed the net only to find reasons why it could exceed 1 if I use ipf or pf rotation for exploratory factory analysis. How about principal...

    Started by talkstats_user‎, 02-15-2015 11:38 PM
    • Replies: 0
    • Views: 1,163
    02-15-2015, 11:38 PM Go to last post
  10. Question Help...please?

    Hi, I'm a bioscience student - stats are not my strength - and I'm trying to analyze some data on R (which I am using for the first time) and I'd...

    Started by RuserJoe‎, 02-05-2015 04:54 AM
    • Replies: 13
    • Views: 2,120
    02-15-2015, 12:51 PM Go to last post
  11. What if...partial correlation is bigger than zero-order correlation?

    Hi everyone, I'm not a statistics-expert, but (shame on me) I'm a teaching assistant for an introductory course of statistics. I always thought...

    Started by Teacher_KB‎, 02-14-2015 12:43 PM
    • Replies: 1
    • Views: 1,760
    02-14-2015, 01:35 PM Go to last post
  12. Fairly simple z table normal distribution question

    Question: the following are the tax refunds from a population of people who had Anderson and Anderson complete their tax returns: 189 765 996...

    Started by Genaden‎, 02-12-2015 09:15 PM
    • Replies: 3
    • Views: 3,621
    02-13-2015, 11:23 PM Go to last post
  13. likert items questionnaire

    Dear all, I would like to ask for some advice regarding the data of a questionnaire i sent out. The questionnaire comprises 10 categegories. Each...

    Started by dulude‎, 02-10-2015 05:24 PM
    anova, likert
    • Replies: 3
    • Views: 1,695
    02-13-2015, 01:43 PM Go to last post
  14. Question on Distribution Type

    I seem to come across problems at times that produce distributions that look similar to the attached file. They are typically very positively...

    Started by yarrick19‎, 02-10-2015 02:41 PM
    • Replies: 5
    • Views: 1,943
    02-13-2015, 11:53 AM Go to last post
  15. What is the correct test? dates included

    Hello, I have a table with dates (every day, ascending order), where each row is the flowing day, and a column with number of expressions....

    Started by eyale‎, 02-13-2015 08:04 AM
    compare time, dates, periods
    • Replies: 0
    • Views: 2,058
    02-13-2015, 08:04 AM Go to last post
  16. Randomized trial sample size CALCULATION - help please

    Could you please help me understand how did they calculate the sample size in this randomized trial ? It is a randomized trial comparing the use...

    Started by goodfella‎, 02-11-2015 06:32 PM
    • Replies: 1
    • Views: 1,139
    02-12-2015, 11:31 AM Go to last post
  17. Combining two standard errors for a ratio

    Hello Stats people! I'm trying to compare two ratios (A1/B1 vs. A2/B2), and only have the means of A1 A2 B1 B2, and the Standard Error of each...

    Started by DJRoomba‎, 02-12-2015 11:09 AM
    • Replies: 0
    • Views: 1,066
    02-12-2015, 11:09 AM Go to last post
  18. Factor analysis (pcf) and linear regression

    Der all, I've got a general question on factor analysis using principle-component-factors in Stata in order to check for the validity of the...

    Started by andik‎, 02-12-2015 03:07 AM
    • Replies: 5
    • Views: 1,710
    02-12-2015, 09:10 AM Go to last post
  19. ANOVA exercise

    Hello, My question is: in which way this exercise should be solved? It can't be solved with F test, because there were no given F-test value table...

    Started by tito‎, 02-11-2015 04:53 PM
    anova, hypotheis test, statistics, stats
    • Replies: 8
    • Views: 1,514
    02-12-2015, 08:21 AM Go to last post
  20. A couple of regression questions

    Hi all, I'm pretty new to statistics and am getting a bit confused with all the terminology that's being thrown out there. I've tried googling...

    Started by DSPorter‎, 02-11-2015 06:54 PM
    • Replies: 3
    • Views: 1,754
    02-12-2015, 07:53 AM Go to last post
  21. Suggestion for Analysis

    I have 2 (control, experimental)groups and i want to compare them on the basis of three types of questions recall , comprehension and...

    Started by kaushal.dgp‎, 02-12-2015 06:26 AM
    • Replies: 0
    • Views: 998
    02-12-2015, 06:26 AM Go to last post
  22. Question Are pH levels considered as discrete or continuous?

    Hi everyone, I'm in desperate need of help with my lab report. I no stats genius so any help from all you stats geniuses will be greatly appreciated....

    Started by xkycee‎, 02-11-2015 10:55 AM
    • Replies: 1
    • Views: 2,504
    02-11-2015, 11:51 AM Go to last post
  23. displaying data

    Hi everyone I have a really basic question. I am displaying mean and standard deviation as a function of time by means of a line plot with scatter...

    Started by foxesarethebuzz‎, 02-11-2015 08:38 AM
    graph, standard deviation
    • Replies: 1
    • Views: 1,052
    02-11-2015, 09:08 AM Go to last post
  24. Question Structural equation modeling - predictor measured in different group

    Dear all, I am kind of stuk on the following problem: what if you would like to create a model, with several predictors. only one important...

    Started by maart91‎, 02-11-2015 08:32 AM
    equation, modeling, placebo, sem, structural
    • Replies: 0
    • Views: 994
    02-11-2015, 08:32 AM Go to last post
  25. Nested and crossed

    hi, I have the folowing design: Two paper suppliers, slips of paper and measurement points on each slip. For each supplier we take, say, 3 slips...

    Started by rogojel‎, 02-10-2015 12:55 AM
    crossed, experiment design, nested analysis
    • Replies: 4
    • Views: 1,294
    02-10-2015, 02:46 PM Go to last post
  26. SPSS, co-occurence measure ?

    Hi, I want to see if two conditions always occur together, using SPSS. That is, I have some events that show a certain characteristic, let's call...

    Started by qwertz1899‎, 02-10-2015 04:57 AM
    conditions, order effects, spps
    • Replies: 0
    • Views: 1,353
    02-10-2015, 04:57 AM Go to last post
  27. Which statistical test do I use?...

    Which statistical test should be best used to analyse this data using SPSS? I am currently observing the effects of specific training programs on...

    Started by TN173‎, 02-09-2015 10:03 AM
    anova
    • Replies: 5
    • Views: 1,670
    02-09-2015, 07:19 PM Go to last post
  28. Most Viewed YouTube Videos in the World

    where can i get the complete statistics of most viewed you tube videos in the world ?

    Started by Lenora‎, 02-09-2015 07:14 AM
    statistics, stats, statsmonkey, world, youtube videos
    • Replies: 0
    • Views: 882
    02-09-2015, 07:14 AM Go to last post
  29. Marketing Question

    We recently conducted a test. We sent a mailing to one population called "A". The size of the population is 79,000. This population had a response...

    Started by marketResearch35‎, 02-08-2015 06:51 PM
    • Replies: 4
    • Views: 2,017
    02-09-2015, 05:12 AM Go to last post
  30. interpretation of intercept and regression coefficient

    This is a multiple linear regression problem with two independent variables. dependent: blood pressure independent: stress and age The raw...

    Started by cowsgomoo731‎, 02-08-2015 03:02 PM
    multiple regression, statistical analysis
    • Replies: 0
    • Views: 988
    02-08-2015, 03:02 PM Go to last post
  31. Standard Deviation Problem

    A student took two test, test A and test B, test A has score=45%, mean=30%, and standard deviation=5%, and test B has score=60%, mean=40%, and...

    Started by Yims Ravelo‎, 02-08-2015 05:51 AM
    • Replies: 2
    • Views: 1,616
    02-08-2015, 12:22 PM Go to last post
  32. CI and Sample sizes: How do you calculate probabilities?

    So, I have a homework problem: Suppose you drew 250 different random samples and constructed an 80% confidence interval for each one. How many of the...

    Started by Somnambulist‎, 02-07-2015 01:49 PM
    • Replies: 1
    • Views: 1,193
    02-07-2015, 06:06 PM Go to last post
  33. Statitics Homework

    Hello everyone, I have a statistic homework to submit. I have answered all question but too sure about the answer. Can you please check my...

    Started by Maths1996‎, 02-07-2015 05:17 PM
    • Replies: 0
    • Views: 1,577
    02-07-2015, 05:17 PM Go to last post
  34. How to solve hypothesis testing problems?

    Can anyone help me how to solve it? I watched videos on youtube but still didn't get it.

    Started by vileplayer‎, 02-07-2015 03:37 AM
    • Replies: 0
    • Views: 1,178
    02-07-2015, 03:37 AM Go to last post
  35. Statistics - Percentages

    a study carried out to investigate the distribution of total braking time (reaction time plus accelerator to brake movement time in ms) during real...

    Started by shamieh‎, 02-06-2015 05:29 PM
    • Replies: 4
    • Views: 2,092
    02-06-2015, 08:52 PM Go to last post
  36. Please help! So confused

    A sample of temperatures of initiating a certain chemical reaction yielded a sample average (degrees celcius) of 87.3 and a sample standard deviation...

    Started by shamieh‎, 02-06-2015 05:00 PM
    • Replies: 2
    • Views: 2,366
    02-06-2015, 06:21 PM Go to last post
  37. ASAP-Help :(

    Help me please, how will I stand on the results of my quantitative research? I have a sample size of N=46, and the results shows that there is no...

    Started by blueberrylove‎, 02-06-2015 05:05 AM
    statistics
    • Replies: 3
    • Views: 1,269
    02-06-2015, 09:50 AM Go to last post
  38. Help needed with Hypothesis Formulation

    Dear all, I am currently conducting research on experiential marketing and its influence on customer loyalty and purchase behavior in the general...

    Started by ktp‎, 02-05-2015 07:26 PM
    • Replies: 1
    • Views: 982
    02-06-2015, 07:53 AM Go to last post
  39. Multiple tests for normality

    I know of many tests for normality, but my problem is that I have many variables (13,000) and each variable does not contain many data points...

    Started by deanl1‎, 02-06-2015 06:41 AM
    • Replies: 1
    • Views: 969
    02-06-2015, 06:45 AM Go to last post
  40. Contrasts in ANOVA

    When calculating Confidence Intervals for contrasts, if we do not use all of the treatment groups (g) should we evaluate N-g using the subset of the...

    Started by jgnerp‎, 02-05-2015 03:43 PM
    • Replies: 7
    • Views: 2,077
    02-05-2015, 10:22 PM Go to last post
  41. how to find statistical significance or variance in the set parameters

    if i have three parameters a,b and c . and in each parameter i have three sub parameters 1 2 and 3. so how should i find the groups in which t test...

    Started by sebi‎, 02-04-2015 11:51 AM
    • Replies: 2
    • Views: 1,547
    02-04-2015, 11:02 PM Go to last post
  42. Data transformation

    Hi everyone1 I am working on reproductive biology of insect. Recently, I have done one way ANOVA (with three variables and one factor) and found...

    Started by nckrao‎, 02-04-2015 01:56 PM
    • Replies: 2
    • Views: 1,407
    02-04-2015, 09:28 PM Go to last post
  43. Conducting Research. Need help with Data Analysis

    Just a little background on my data: I have been thinking about names and how I cannot imagine anyone I know to have a different name. Their name...

    Started by BrownIRL‎, 02-04-2015 03:42 PM
    • Replies: 1
    • Views: 1,280
    02-04-2015, 05:49 PM Go to last post
  44. Derive a cumulative distribution curve from a continuous (non-binned) histogram

    I am looking for a procedure that will derive a cumulative distribution function from a black body radiation curve described by Planck's law,...

    Started by davidlaing‎, 02-04-2015 10:49 AM
    continuous histogram, cumulative distribution, unbinned
    • Replies: 2
    • Views: 1,285
    02-04-2015, 02:47 PM Go to last post
  45. Need suggestions for young students analyzing T/F data

    I teach an intro course in robotics to middles school students. I need help on how they can conclude from data that is T/F. I encourage them to...

    Started by John Kauffman‎, 02-03-2015 12:45 PM
    • Replies: 5
    • Views: 1,417
    02-04-2015, 12:22 PM Go to last post
  46. How to detect a differnec on two distributions

    Hello everyone, I would like to compare the distribution of night bat activity recorded each hour from 5 pm to 3am (a number of call per hour)...

    Started by Placo‎, 02-02-2015 04:54 PM
    • Replies: 2
    • Views: 1,455
    02-03-2015, 08:52 AM Go to last post
  47. Help deciding between Generalized Estimating Equations and Hierarchical Regression?

    Hi all, So I've got a large data set (actually a bunch of separate sets that I will need to combine) based on repeated measures of young...

    Started by Schecter‎, 02-02-2015 07:57 PM
    • Replies: 1
    • Views: 1,421
    02-03-2015, 03:21 AM Go to last post
  48. Chi-Squared Help

    I am working on a homework set and I am very confused on this question...Can someone help me understand? What's wrong with this statement?...

    Started by carlyhenderson‎, 02-02-2015 11:04 PM
    chi square test, chi-square help
    • Replies: 0
    • Views: 2,263
    02-02-2015, 11:04 PM Go to last post
  49. Likert Scale vs Conjoint Analysis. Which to use?

    Dear Forum professors, I am planning to conduct a questionnaire to obtain information of a tenant's perspective on management in a building. I...

    Started by LittleWar‎, 02-01-2015 04:46 AM
    conjoint analysis, likert
    • Replies: 2
    • Views: 1,654
    02-02-2015, 09:25 PM Go to last post
  50. Minimum sample size needed to evaluate the performance of a binary classifier?

    Im trying to determine the minimum sample size(s) needed to evaluate the performance of a binary classifier with a statistically significant result....

    Started by mystatsarerusty‎, 02-02-2015 07:35 PM
    • Replies: 0
    • Views: 1,078
    02-02-2015, 07:35 PM Go to last post
  51. How to compare two populations with multiple categories of variables

    Just looking for a little advice on how best to approach this. Generally: I have 2 populations each with 3 variables. The first variable is...

    Started by thompa2‎, 02-02-2015 04:02 PM
    • Replies: 2
    • Views: 1,553
    02-02-2015, 04:43 PM Go to last post
  52. (SEM) Structural Modeling: identifying problems

    Hello, I've received a homework at my UNI to resolve untill my exam (which is friday). It's about SEM. It is in form of a forum post and we need to...

    Started by agata90‎, 02-02-2015 02:12 PM
    • Replies: 2
    • Views: 1,761
    02-02-2015, 04:43 PM Go to last post
  53. MANOVA vs. ANOVA

    Hi, I am trying to determine which of a number of variables differentiate between 3 groups. The groups were created based on cluster analysis,...

    Started by saskiaferrar‎, 02-02-2015 12:21 PM
    anova, manova
    • Replies: 0
    • Views: 1,247
    02-02-2015, 12:21 PM Go to last post
  54. Thumbs up trying to determine which test to use for constancy of mean price of milk

    "You have been asked to determine if the mean price of milk in your city has remained constant. Suppose that a random sample of n=2 was selected for...

    Started by Jones‎, 02-01-2015 03:44 PM
    • Replies: 0
    • Views: 1,622
    02-01-2015, 03:44 PM Go to last post
  55. Confidence Interval for binary data

    If I want to calculate the 99% confidence interval for binary data. For example lets say I asked 500 people if they had ever done a bungee jump? ...

    Started by calypso‎, 02-01-2015 02:48 PM
    • Replies: 0
    • Views: 2,259
    02-01-2015, 02:48 PM Go to last post
  56. Cool Sample size calculation for kappa statistic, at 90% power

    Hello everyone! I have looked through many previous posts, but cannot find an answer to my question. I am comparing the results from two pieces of...

    Started by CatherineS‎, 02-01-2015 09:37 AM
    • Replies: 1
    • Views: 4,570
    02-01-2015, 10:24 AM Go to last post
  57. Adding the mean to a set of scores doesn't change it. Why?

    Hello everybody! I am very happy to have found this forum. I am working away with my undergraduate research methods courses. I am not very good at...

    Started by Suzy46‎, 01-30-2015 01:40 PM
    • Replies: 8
    • Views: 2,625
    01-31-2015, 04:58 AM Go to last post
  58. Performing a Paired T test

    239 subjects had their cholesterol measured, and then were put on high-fiber diets. After a month on the high-fiber diet, the cholesterol was...

    Started by raidernation‎, 01-30-2015 11:39 PM
    • Replies: 0
    • Views: 1,243
    01-30-2015, 11:39 PM Go to last post
  59. Is there a way to convert relative risk to cohen's d or odd's ratios?

    So I only have RR but no counts. For a meta-analysis these need to be put on a common metric with other results which all use cohen's d. Hence the...

    Started by Lazar‎, 01-29-2015 05:58 PM
    • Replies: 10
    • Views: 3,643
    01-30-2015, 05:42 PM Go to last post
  60. Equivalence testing - on IQ scores for independent groups

    Equivalence testing IQ Hello, I want to conduct a test of equivalence on IQ between two groups. I came across a post where someone (I think it was...

    Started by Siobh‎, 01-30-2015 05:44 AM
    • Replies: 6
    • Views: 1,875
    01-30-2015, 03:01 PM Go to last post

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