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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: 197,128
    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: 66,938
    09-30-2005, 09:44 AM Go to last post
  1. Uniforming data to produce better graph

    Hello, forum! This is my first post here and I really hope someone can help me. I have to draw a graph of two very long columns of data. Both...

    Started by 41310602613‎, 03-07-2015 02:42 PM
    • Replies: 0
    • Views: 1,186
    03-07-2015, 02:42 PM Go to last post
  2. Cool Analytical flow, correlation research

    Hi Stat's experts. For my Experiment which I classified as Correlational research I will look for relations to Breathing pattern disorders (BPD)....

    Started by ohdear‎, 03-07-2015 05:22 AM
    correlation research, stat's experts
    • Replies: 0
    • Views: 951
    03-07-2015, 05:22 AM Go to last post
  3. Hypothesis test help.

    The temperature in degrees Fahrenheit of a random group of healthy adults are 97.0 97.4 99.3 97.7 98.6 99.7 97.5 98.7 96.9 97.9 97.3 ...

    Started by HaleyLee‎, 03-06-2015 03:34 PM
    hypothesis test, sign test
    • Replies: 1
    • Views: 1,236
    03-06-2015, 04:46 PM Go to last post
  4. Thumbs down Test for differences across tasks according to group

    Hello, Hoping someone can help as I am at a bit of a loss of what inferential statistics to run for my masters work. I have low anxiety and...

    Started by Jonesw‎, 03-06-2015 01:44 PM
    anova, eek, losing hope, statistics, t test
    • Replies: 1
    • Views: 1,271
    03-06-2015, 02:47 PM Go to last post
  5. Variance in 2 data sets has led to variance in other 2 data sets

    Hi, everybody! I have conducted a research aimed to determine the content of active ingredient of a brand drug. I have tested 2 strengths of the...

    Started by blue_clouds_mountain‎, 03-06-2015 04:21 AM
    • Replies: 0
    • Views: 1,273
    03-06-2015, 04:21 AM Go to last post
  6. sample size calculation

    I am trying to determine the necessary sample size I need for a study. Standard 80% power and </= 0.05 p value. The study is designed to use two...

    Started by GGarvin‎, 03-05-2015 09:14 PM
    • Replies: 0
    • Views: 1,458
    03-05-2015, 09:14 PM Go to last post
  7. Stat Help

    never mind, solved it

    Started by youngmusashi‎, 03-05-2015 09:02 PM
    • Replies: 0
    • Views: 1,528
    03-05-2015, 09:02 PM Go to last post
  8. Large dataset mixed ANOVA - problems with Levene's and outliers?

    Hello, I'm a psychology student in need of a bit of help. I've run a principle components analysis on a large data set (N=824, 600 female, 224...

    Started by mslocombe‎, 03-05-2015 03:53 PM
    • Replies: 0
    • Views: 2,513
    03-05-2015, 03:53 PM Go to last post
  9. Time Series out of sample forecast period?

    Hello everyone. It is my understanding that if one wants to built a time series model on data a time series that went from 2000 to today (2015)...

    Started by Anotherdream‎, 03-05-2015 03:10 PM
    • Replies: 1
    • Views: 1,014
    03-05-2015, 03:41 PM Go to last post
  10. Normal Approximation to the binomial

    I'm trying to calculate the probability that there are greater than 300 successes from a pool of 1000 trials. I am told to use the normal...

    Started by itrimara‎, 03-05-2015 03:01 PM
    approximation, binomial, normal, success
    • Replies: 0
    • Views: 1,074
    03-05-2015, 03:01 PM Go to last post
  11. How to perform two samples z test in Doronix Math Toolbox?

    I'm using Doronix Math Toolbox. But I can't find how to perform 2 samples z test there. Can anyone help me? Thank you very much.

    Started by James L.‎, 03-05-2015 09:35 AM
    doronix, ztest
    • Replies: 6
    • Views: 2,484
    03-05-2015, 12:12 PM Go to last post
  12. Book

    Hello, I need the recommendation of a book that covers the following topics: 1) Generation of pseudo uniform random numbers. 2) Simulation...

    Started by askazy‎, 03-04-2015 05:29 PM
    • Replies: 2
    • Views: 975
    03-05-2015, 11:52 AM Go to last post
  13. Mixed models - theoretical question

    Hallo all, I'm reviewing an experimental design where the aim was to establish whether two groups of speakers were substantially different from...

    Started by drewmac‎, 03-05-2015 09:07 AM
    • Replies: 1
    • Views: 1,097
    03-05-2015, 09:54 AM Go to last post
  14. multilevel linear model in SPSS (mixed model)

    Hi, I have a hierarchical data structure of 5 levels (with time at the lowest level-1 as within-sujects factor) and would like to control for levels...

    Started by pete1234‎, 03-05-2015 02:33 AM
    • Replies: 0
    • Views: 1,237
    03-05-2015, 02:33 AM Go to last post
  15. Would Chi square test of homogeneity be appropriate ?

    Hi My respondents are a sample of 400 Teachers, out of which 290 are male 110 are female. I have used 5 point Likert's scale as 1 = strongly agree...

    Started by CAShobana‎, 03-04-2015 10:12 AM
    • Replies: 2
    • Views: 1,496
    03-05-2015, 12:00 AM Go to last post
  16. Help with statistics

    Only statistics that you need to calculate for it are the means, standard deviations, and sample sizes. Here are the results: Nutrient ...

    Started by cay‎, 03-03-2015 05:54 PM
    statistic
    • Replies: 5
    • Views: 2,036
    03-04-2015, 11:36 PM Go to last post
  17. Which statistics program is this? (Panel VAR analysis)

    I have been trying to find the program that authors of a couple of different studies used to show off impulse response functions of panel VARs. I am...

    Started by Tony123‎, 03-02-2015 02:50 PM
    • Replies: 2
    • Views: 1,222
    03-04-2015, 01:35 PM Go to last post
  18. What kind of test?

    Hi all I'm sorry to bother you with something you've probably seen a lot, but I'm doing an experiment for a module and I need some help on...

    Started by tifabeni‎, 03-04-2015 08:53 AM
    • Replies: 0
    • Views: 1,159
    03-04-2015, 08:53 AM Go to last post
  19. Question Help: Which test to use for comparing variability

    Hi: I am wondering if I can ask a bit of help. I have patients undergoing two different procedures (binary factor). One of the outcomes is is...

    Started by nomadic‎, 03-03-2015 07:47 PM
    variability
    • Replies: 2
    • Views: 1,269
    03-04-2015, 07:32 AM Go to last post
  20. combining a random, variable and its inverse

    I am measuring two scientific entities, X and Y using empiric measurements. Each has its own mean and sample variance based on Nx and Ny sample...

    Started by jobxyz1‎, 03-03-2015 08:08 AM
    geometric mean, inverse
    • Replies: 2
    • Views: 1,248
    03-04-2015, 06:50 AM Go to last post
  21. Calculate increase amount of product sales?

    Hello, My question is that; for example we have two products that different price and different sales volume. According to example below, we...

    Started by bomonti‎, 03-04-2015 03:26 AM
    • Replies: 0
    • Views: 1,463
    03-04-2015, 03:26 AM Go to last post
  22. Calculating sample size

    Hello, I am going to conduct a research and would like to estimate the sample size that I will need. Here is the information that I have, please...

    Started by Goocha‎, 03-03-2015 02:52 PM
    proportion, sample size calculation
    • Replies: 3
    • Views: 1,667
    03-04-2015, 02:47 AM Go to last post
  23. Urgent help with statistical test please

    Hi everyone. I am a novice at statistical tests, as such I need urgent help in determining what type of statistical test to use in hypothesis testing...

    Started by oludot5‎, 03-03-2015 05:19 AM
    • Replies: 6
    • Views: 1,754
    03-03-2015, 05:26 PM Go to last post
  24. propagated error in formula with regression coefficient based on uncertain x data

    Hello, I am working on a Masters thesis in mechanical/energy system engineering and after reading my statistics books and searching this forum and...

    Started by BrianNoland‎, 03-03-2015 05:21 PM
    • Replies: 0
    • Views: 1,124
    03-03-2015, 05:21 PM Go to last post
  25. Arrow Time Series Analysis Threshold Value

    I have time-series data for 0 min, 5 min, 10 min, etc. for 5000 genes. (Gene expression). I want to set a threshold value to eliminate reads that...

    Started by inferno‎, 03-03-2015 12:57 AM
    statistics, test statistic, threshold, time series analysis
    • Replies: 0
    • Views: 1,046
    03-03-2015, 12:57 AM Go to last post
  26. Percent Error with Limited Precision

    Consider an experimental data point with limited precision, such as 1.5 0.2. The actual value is 1.6. How would one report the percent error,...

    Started by EdwardElric‎, 03-02-2015 11:32 PM
    • Replies: 0
    • Views: 980
    03-02-2015, 11:32 PM Go to last post
  27. 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: 3
    • Views: 2,339
    03-02-2015, 11:18 PM Go to last post
  28. Recently, steps have been made to substantially improve the process.

    Recently, steps have been made to substantially improve the process. A P chart has been plotted for some time. One would not be surprised to find...

    Started by alladin‎, 03-02-2015 07:32 PM
    • Replies: 0
    • Views: 2,712
    03-02-2015, 07:32 PM Go to last post
  29. Explaining different process variances

    Hi everybody, The situation: I'm stuck with the following problem: some measurements are done on a number of batches. These measurements are assays...

    Started by Bmi‎, 03-02-2015 05:41 PM
    process variance, variance components
    • Replies: 0
    • Views: 1,137
    03-02-2015, 05:41 PM Go to last post
  30. 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: 3
    • Views: 1,779
    03-02-2015, 12:48 PM Go to last post
  31. For Process Capability, what is Null Hypothesis

    1) That the ratio between the specs and the process spread should be one 2) That the ratio between the specs and the process spread should be larger...

    Started by alladin‎, 03-01-2015 08:46 PM
    • Replies: 2
    • Views: 3,846
    03-02-2015, 08:00 AM Go to last post
  32. 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, 02-28-2015 08:17 AM
    • Replies: 5
    • Views: 2,180
    03-02-2015, 03:46 AM Go to last post
  33. Need help, Stats will probably be the death of me...

    Hello everyone on the forum! I am by no means a mathematician, so how I ended up in Statistics II is beyond me. Unfortunately, I received a wonderful...

    Started by Henry11‎, 02-28-2015 08:01 PM
    • Replies: 0
    • Views: 1,212
    02-28-2015, 08:01 PM Go to last post
  34. Please please help! asap my deadlines tomorrow! please!

    Hi! I need to test whether this set of scores is at an above chance level where 0 indicates a chance level? 0.58 0.42 0.33 -0.02 0.44 0.62

    Started by Imogen9286‎, 02-28-2015 07:40 PM
    • Replies: 0
    • Views: 1,332
    02-28-2015, 07:40 PM Go to last post
  35. Post Transforming Negatively Skewed Independent Groups

    I have two independent groups, (roughly 30 in each) and their performance on 3 different tasks, there are 10 scores in total for each group. The...

    Started by cxds‎, 02-28-2015 02:13 PM
    psychology, skew, transformation
    • Replies: 0
    • Views: 1,090
    02-28-2015, 02:13 PM Go to last post
  36. 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: 1,541
    02-27-2015, 08:14 AM Go to last post
  37. 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, 02-27-2015 07:12 AM
    • Replies: 0
    • Views: 893
    02-27-2015, 07:12 AM Go to last post
  38. 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: 1,433
    02-26-2015, 03:29 PM Go to last post
  39. 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: 1,323
    02-26-2015, 02:21 PM Go to last post
  40. 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: 1,204
    02-26-2015, 10:28 AM Go to last post
  41. 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: 1,222
    02-25-2015, 05:25 PM Go to last post
  42. 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: 1,565
    02-25-2015, 10:31 AM Go to last post
  43. 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: 1,068
    02-25-2015, 10:05 AM Go to last post
  44. 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: 2,066
    02-24-2015, 02:46 PM Go to last post
  45. 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: 838
    02-24-2015, 12:48 PM Go to last post
  46. 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: 1,202
    02-24-2015, 09:40 AM Go to last post
  47. 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: 1,445
    02-24-2015, 05:47 AM Go to last post
  48. 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: 1,006
    02-23-2015, 11:01 PM Go to last post
  49. 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: 1,133
    02-23-2015, 03:43 PM Go to last post
  50. 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: 1,762
    02-23-2015, 02:05 PM Go to last post
  51. 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: 1,027
    02-23-2015, 10:27 AM Go to last post
  52. 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: 1,400
    02-23-2015, 09:05 AM Go to last post
  53. 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: 1,871
    02-23-2015, 07:25 AM Go to last post
  54. 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: 1,115
    02-22-2015, 10:41 PM Go to last post
  55. 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: 1,315
    02-22-2015, 09:24 PM Go to last post
  56. 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: 1,826
    02-22-2015, 04:57 PM Go to last post
  57. 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: 1,854
    02-22-2015, 04:53 AM Go to last post
  58. 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: 4,188
    02-21-2015, 10:44 AM Go to last post
  59. 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: 1,310
    02-20-2015, 06:23 PM Go to last post
  60. 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: 1,020
    02-20-2015, 02:37 PM Go to last post

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