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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: 89,173
    07-16-2014, 12:01 PM 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 10:44 AM
    • Replies: 0
    • Views: 27,864
    09-30-2005, 10:44 AM Go to last post
  1. help on what stats test to do on my data!!

    Hi i have results for my dissertation on the type of resistance my bacteria have. for one sample (water), i have 40 non resistant colonies, 3...

    Started by liam1994‎, Today 08:17 AM
    • Replies: 1
    • Views: 2
    Today, 08:33 AM Go to last post
  2. Calculating UCL for control chart

    Hi guys, I am studying for an exam and can't for the life of me figure out this question, would someone on here perhaps know how to get the...

    Started by newguy234‎, 02-26-2015 11:56 AM
    • Replies: 3
    • Views: 126
    Yesterday, 08:14 AM Go to last post
  3. Lognormal distribution - calculating the standard deviation from %iles

    I have the mean and percentiles of a variable (flow) which I believe can be represented by a lognormal distrbution. How do I calculate the standard...

    Started by maspiers‎, Yesterday 07:12 AM
    • Replies: 0
    • Views: 69
    Yesterday, 07:12 AM Go to last post
  4. Z test

    My Intro Stats book mentions about inferring a population mean from a sample when a population standard deviation known, "a Z test". For a Z...

    Started by StilloftheNight‎, 02-26-2015 08:31 PM
    • Replies: 0
    • Views: 107
    02-26-2015, 08:31 PM Go to last post
  5. Need help for statistic Question

    I an doing some statistic exercise, I got the wrong answer, but have no clue how to get the correct answer.(The question is at the following picture,...

    Started by holahapi‎, 02-26-2015 06:14 AM
    • Replies: 2
    • Views: 113
    02-26-2015, 03:29 PM Go to last post
  6. Statistics II Excel Hangups

    Hello all, I somehow find myself Statistics II. As a gen-ed student at a community college, this is the final math course required of me and what...

    Started by Locoboy‎, 02-23-2015 08:29 PM
    • Replies: 9
    • Views: 189
    02-26-2015, 02:21 PM Go to last post
  7. Distribution with Median=Mode=Mean?

    Hello. Is there any important distribution with Median=Mode=Mean, apart from the Gaussian and Student's distribution?

    Started by skan‎, 02-26-2015 08:19 AM
    • Replies: 1
    • Views: 104
    02-26-2015, 10:28 AM Go to last post
  8. power analysis- interpreting sample size given established literature

    Hello and thank you for clicking, I am attempting to use relevant effects size from a published study to obtain a suggested sample size for my...

    Started by a. whit‎, 02-24-2015 06:38 PM
    anova, effect size, gpower, power analysis, sample size calculation
    • Replies: 3
    • Views: 125
    02-25-2015, 05:25 PM Go to last post
  9. Parents Sue School - Hypothesis Testing and P-Values

    Hi Guys, https://www.youtube.com/watch?v=jWqd76kmtV4&feature=youtu.be I would appreciate some input on what figures do I need crunch exactly...

    Started by Belledeux‎, 02-25-2015 02:11 AM
    • Replies: 3
    • Views: 125
    02-25-2015, 10:31 AM Go to last post
  10. Gaussian Density

    Hi everyone, I'm making some practice exam questions and hope someone can help me with the following problem: The inverse Gaussian density is...

    Started by Artreides‎, 02-24-2015 10:47 AM
    • Replies: 6
    • Views: 104
    02-25-2015, 10:05 AM Go to last post
  11. Deviance for "neutral"

    Hello, if I define a numerical scale from 1 to 9, where 1 is "very negative" and 9 is "very positive" and define 5 as the value for "neutral",...

    Started by jstorc‎, 02-24-2015 12:32 PM
    • Replies: 11
    • Views: 165
    02-24-2015, 02:46 PM Go to last post
  12. Post how to analyse RCBD single factor with unequal variances

    data is not showing normal distribution. I want make it group to the AIC value, but I can't. Please help me out to make the group and finding AiC...

    Started by shafiqul‎, 02-24-2015 12:48 PM
    rcbd single unequal var
    • Replies: 0
    • Views: 74
    02-24-2015, 12:48 PM Go to last post
  13. Lack of correspondent Analysis

    Hi, I am doing a research of plants. However, not sure what statistical method I should use. The response variable is the number of flowers for...

    Started by canivale‎, 02-23-2015 10:47 AM
    • Replies: 2
    • Views: 110
    02-24-2015, 09:40 AM Go to last post
  14. one way anova or nonparametric?

    in the attached file you can see the results from a viability test after normalization. Each column represents a different kind of treatment and in...

    Started by sofiail‎, 02-20-2015 03:58 AM
    • Replies: 2
    • Views: 117
    02-24-2015, 05:47 AM Go to last post
  15. I have an actual and estimated time series to compare - linear regression ok?

    I'm pretty new to this but trying to figure out which estimated time series does a better job of predicting what the actuals are. I have two...

    Started by andy_d314‎, 02-23-2015 11:01 PM
    • Replies: 0
    • Views: 67
    02-23-2015, 11:01 PM Go to last post
  16. Power analysis (gpower) - interactions

    I'd like to conduct a power analysis in gpower to determine the total N required in a study, with the following requirements: power desired: 0.80...

    Started by Nem‎, 02-23-2015 03:43 PM
    effect size, gpower, interactions, power
    • Replies: 0
    • Views: 82
    02-23-2015, 03:43 PM Go to last post
  17. Power analysis question

    Hello. I have two distributions A and B. They're normally distributed, and are not significantly different (by t-test). From experimental design,...

    Started by Qroid‎, 02-22-2015 09:10 PM
    • Replies: 4
    • Views: 173
    02-23-2015, 02:05 PM Go to last post
  18. General query about small uneven samples

    My sample size is around 60 particpants (30 in each condition - controls vs patients). My participants are children and the tests I use depend on...

    Started by Toivo‎, 02-16-2015 08:36 AM
    • Replies: 3
    • Views: 142
    02-23-2015, 10:27 AM Go to last post
  19. Question Samples and Sampling Distribution

    Inferential statistics are based on the Law of Large Numbers (LLN), the Central Limit Theorem (CLT), and sampling distributions. How does a sample...

    Started by DrAnthonyRodriguez‎, 02-23-2015 08:30 AM
    • Replies: 2
    • Views: 111
    02-23-2015, 09:05 AM Go to last post
  20. Need help - Equal/Unequal Variance

    Hi, In performing T-Test on mean water temperature with 2 samples, how do I justify the use of equal or unequal variance? In practical, all...

    Started by westbat‎, 02-22-2015 09:23 AM
    • Replies: 2
    • Views: 158
    02-23-2015, 07:25 AM Go to last post
  21. Normality and distributions

    Hi guys, I have two variables of which are quite similar (test scores). I have data which I initially thought was normal based on the...

    Started by jle‎, 02-22-2015 10:41 PM
    • Replies: 0
    • Views: 135
    02-22-2015, 10:41 PM Go to last post
  22. Average Percent Change

    When finding the average percent change of different data points in time, should I average the points together first and then find the percent change...

    Started by chanman876‎, 02-22-2015 02:03 PM
    percent change
    • Replies: 1
    • Views: 107
    02-22-2015, 09:24 PM Go to last post
  23. Test on Two Mean Vectors

    Hello. I am currently taking a multivariate statistics course and having trouble with this problem. Test Ho: μ' =(6,11) ....... 3 ...

    Started by student10022‎, 02-22-2015 03:34 PM
    matrix, multivariate, two mean comparison, vector
    • Replies: 2
    • Views: 145
    02-22-2015, 04:57 PM Go to last post
  24. Stata Help Wanted

    Hello, Can someone offer some help with Stata. I need to know the following. 1) which are independent and which are dependent variables. 2) ...

    Started by IanB‎, 02-18-2015 12:49 AM
    csv file, horse racing statistics, logit regression, modeling techniques, regression coefficients
    • Replies: 5
    • Views: 176
    02-22-2015, 04:53 AM Go to last post
  25. How do I find standard deviation without a sample size ?

    I have been working on a problem with the help of a friend who is pretty knowledgeable on the subject. I don't think this is possible to find a...

    Started by Actress80‎, 02-20-2015 02:33 PM
    • Replies: 2
    • Views: 187
    02-21-2015, 10:44 AM Go to last post
  26. homoscedasticity assumption in linear regression

    If we have a usual linear regression model Y = beta0 + beta1*X + e If we say that e is independent of X, does this automatically imply that var(e)...

    Started by Alex C‎, 02-20-2015 09:46 AM
    • Replies: 3
    • Views: 119
    02-20-2015, 06:23 PM Go to last post
  27. Problem using CSLOGISTIC command in SPSS

    I moved this to the SPSS section, for three reasons. (1) SPSS section more appropriate, (2) I got many views here, but not suggestions, (3) I had an...

    Started by tdf‎, 02-20-2015 02:37 PM
    logistic regression, spss
    • Replies: 0
    • Views: 100
    02-20-2015, 02:37 PM Go to last post
  28. Can it be yes Poisson and no Binomial?

    Hey everyone I am starting to learn stats and I have a question. Basically I want to know if any of you can give me an example where the...

    Started by azumz‎, 02-20-2015 02:04 PM
    • Replies: 0
    • Views: 68
    02-20-2015, 02:04 PM Go to last post
  29. Correct Statistical Test

    Hello, I got set of data that need analyzing to test for the effects of wildfires on Nitrogen Mineralization (image attached). The results are from...

    Started by sleekcollins‎, 02-19-2015 04:34 PM
    • Replies: 4
    • Views: 183
    02-20-2015, 11:22 AM Go to last post
  30. Please help - Sample size calculation

    I am designing a study in which a new drug x is given to patients on drug y and then drug y is withdrawn. If the required success rate is 80%: How...

    Started by Learner1‎, 11-30-2011 01:29 AM
    sample size determination
    • Replies: 5
    • Views: 2,376
    02-20-2015, 11:17 AM Go to last post
  31. Stat question (probabilities)

    Can anyone show me how to calculate this probability? We have two people A and B. The probability that a person has blond hair is 20.7%. If 2...

    Started by Jfasken‎, 02-19-2015 03:01 PM
    • Replies: 0
    • Views: 115
    02-19-2015, 03:01 PM Go to last post
  32. Smile Benchmarking and Statistical Difference

    Hey everyone, I have a few issues and would really appreciate your help :) Thank you very much ! So here it goes : I have two levels ( A...

    Started by morgano‎, 02-17-2015 05:21 PM
    benchmarking, multiple comparisions, statistical analysis
    • Replies: 1
    • Views: 197
    02-19-2015, 02:48 PM Go to last post
  33. questionnaire and correlation

    Hello, I have a questionnaire regarding satisfaction at work. I used alpha-Cronbach and all is good. My question is how do I correlate the group of...

    Started by eyalec‎, 02-19-2015 09:38 AM
    • Replies: 1
    • Views: 81
    02-19-2015, 11:36 AM Go to last post
  34. Britain (UK) Billionaires List by Net Worth

    Get the statistics report of Britain (UK) billionaires list by net worth @ ...

    Started by Lenora‎, 02-19-2015 03:45 AM
    billionaires, statistics, stats, statsmonkey, united kingdom
    • Replies: 0
    • Views: 59
    02-19-2015, 03:45 AM Go to last post
  35. 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: 115
    02-18-2015, 09:51 AM Go to last post
  36. 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: 289
    02-18-2015, 05:46 AM Go to last post
  37. Mixed ANOVA withinXbetween interaction not significant, interpret simple effects?

    Hi Experts, I have conducted a 2 (time: before, after) x 3 (condition 1 2 3) mixed ANOVA. The within X between interaction is only marginally...

    Started by oarnold‎, 02-17-2015 08:57 PM
    interaction, mixed anova, simple effects
    • Replies: 0
    • Views: 95
    02-17-2015, 08:57 PM Go to last post
  38. 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: 208
    02-17-2015, 02:57 PM Go to last post
  39. 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: 202
    02-17-2015, 07:51 AM Go to last post
  40. Central limit theorem effect of number of samples vs sample size

    Hey guys, For an assignment I've been asked to investigate the CLT when sampling from different distributions using different sample sizes. Do to...

    Started by lken‎, 02-16-2015 04:53 PM
    central limit theorem, clt, sample size
    • Replies: 2
    • Views: 178
    02-16-2015, 08:37 PM Go to last post
  41. how to calculate multiple related odds/chances

    I am not sure if this is the right forum or not, if not please excuse me. This is not a homework question either, it is more of test strategy...

    Started by mrx‎, 02-16-2015 05:40 PM
    • Replies: 0
    • Views: 161
    02-16-2015, 05:40 PM Go to last post
  42. 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: 115
    02-16-2015, 04:03 PM Go to last post
  43. 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: 144
    02-16-2015, 12:37 PM Go to last post
  44. 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: 104
    02-16-2015, 11:16 AM Go to last post
  45. 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: 67
    02-16-2015, 09:25 AM Go to last post
  46. 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: 93
    02-15-2015, 11:38 PM Go to last post
  47. 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: 517
    02-15-2015, 12:51 PM Go to last post
  48. 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: 149
    02-14-2015, 01:35 PM Go to last post
  49. 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: 229
    02-13-2015, 11:23 PM Go to last post
  50. 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: 176
    02-13-2015, 01:43 PM Go to last post
  51. 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: 215
    02-13-2015, 11:53 AM Go to last post
  52. 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: 131
    02-13-2015, 08:04 AM Go to last post
  53. 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: 137
    02-12-2015, 11:31 AM Go to last post
  54. 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: 87
    02-12-2015, 11:09 AM Go to last post
  55. 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: 165
    02-12-2015, 09:10 AM Go to last post
  56. 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: 232
    02-12-2015, 08:21 AM Go to last post
  57. 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: 187
    02-12-2015, 07:53 AM Go to last post
  58. 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: 81
    02-12-2015, 06:26 AM Go to last post
  59. 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: 93
    02-11-2015, 11:51 AM Go to last post
  60. 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: 107
    02-11-2015, 09:08 AM Go to last post

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