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# Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

1. ### 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...

• Replies: 1
• Views: 196,927
07-16-2014, 11:01 AM
2. ### 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)...

• Replies: 0
• Views: 66,843
09-30-2005, 09:44 AM
1. ### Is this correct?

Hi, I have 2 questions I'm not sure of. 1.) According to a 1997 study, 29.3% of self- employed persons worked on their home based businesses 35...

• Replies: 1
• Views: 3,454
08-01-2014, 09:15 AM
2. ### Rolling Dices

here is how the problem goes: Charlie and Dave are betting over a sequence of rolls of a single die. Charlie will win the first time consecutive...

• Replies: 1
• Views: 2,744
08-01-2014, 09:10 AM
3. ### A few questions

Hi just wondering if anyone could just make sure I'm doing this right. Can you also help on the last question especially. Thanks 1) Z~N(0,1) and...

• Replies: 1
• Views: 2,452
08-01-2014, 09:01 AM
4. ### Comparing two test conditions two different ways -- what is the logical difference?

Consider this: Test 1: Heat treat and check hardness of 8 samples at two different heat treat oven settings (for simplicity, let's call them HOT...

• Replies: 5
• Views: 2,127
08-01-2014, 07:51 AM
5. ### lmPerm - has it been removed?

I can't seem to find this package - "lmPerm" (linear model permutation test). On the page http://cran.r-project.org/web/packages/lmPerm/index.html...

• Replies: 0
• Views: 3,134
08-01-2014, 06:41 AM
6. ### Problematic variables in regression model

I'm using data from from a publicly available Europe-wide survey of employees which was conducted over a series of waves from 1991-2010. The survey...

• Replies: 0
• Views: 1,397
08-01-2014, 05:00 AM
7. ### Histogram

Hello, I have a question: What obvious information do histograms give. For example, I know that scatterplots show the strength and the direction...

• Replies: 6
• Views: 4,386
07-31-2014, 11:54 AM
8. ### Beginner Confidence Level Question

Hope someone can assist. Tyring to calaculate a confidence Levels and intervlas if possible for an upcoming Audit. I want to make sure I collect...

• Replies: 1
• Views: 1,086
07-31-2014, 11:01 AM
9. ### Within-subjects test for equality of variances with dichotomous variables

Does anyone know any test for equality of variances when using dichotomous variables and related samples? Thank you all.

• Replies: 0
• Views: 852
07-31-2014, 04:14 AM
10. ### Reducing number of categories for independence tests

Consider categorical variable wich falls naturally into K categories. Given 2 data sets (or samples), one usually considers 2xK contingency table for...

• Replies: 3
• Views: 1,115
07-30-2014, 04:58 PM
11. ### Using a kurtosis statistic as a dependent variable

Hi everyone, I am working on a research project in public policy and I am testing kurtosis for on the year-to-year budget changes (as %) in...

• Replies: 1
• Views: 1,084
07-30-2014, 01:37 PM
12. ### Basic Sample Sizing Question

Hi all, I haven't done any stats for a long time, I am looking to incorporate some stats into my Ops Risk role to get a little edge. I think I am...

• Replies: 3
• Views: 1,433
07-30-2014, 08:04 AM
13. ### Find weak periodical pattern from time series data

I have a piece of time series data as shown in the following link. http://postimg.org/image/9sf858wyr/ There exist a weak periodical pattern (it...

• Replies: 0
• Views: 734
07-29-2014, 03:20 PM
14. ### Repeated Measures ANOVA and baseline control

I’ve been asked to work on a cross-over design study for an MSc project. The study is looking at the effects of sleep deprivation on word recall. ...

• Replies: 1
• Views: 926
07-29-2014, 05:51 AM
15. ### I really need help interpreting this study?

Hello, I'm actually trying to write a sociology paper on race, but I have no idea how to interpret this study:...

• Replies: 13
• Views: 1,722
07-27-2014, 01:02 PM
16. ### Comparing two large categorical data sets with low counts

I'm studying a biological feature which can be classified into 2^20 categories. These categories can be thought as a dictionary of a fixed-length...

• Replies: 4
• Views: 1,899
07-27-2014, 12:38 PM
17. ### Multiple Imputations in a Dataset

Dear all, I'm a student working on a dataset based on a cross-sectional survey. The dataset includes around 200participants. The main analysis...

• Replies: 0
• Views: 927
07-27-2014, 07:18 AM
18. ### Predictive model needed - bespoke or off the shelf software ?

Good day all, I am a complete novice with stats and zero experience but I do have a stats problem regarding data I have in excel and seek some...

• Replies: 1
• Views: 1,713
07-27-2014, 12:06 AM
19. ### Need help choosing statistical test for catagorical data

Hi, I am not sure which statistical test I should do. My values are in percentages and the categorical data is for different climate scenarios. I...

• Replies: 0
• Views: 1,057
07-25-2014, 09:10 AM
20. ### Comparing the variance of two samples with differing measurement error

This is a statistics as applied to astronomy problem - I apologise in advance for my woeful stats knowledge! OK - the problem: For several...

• Replies: 0
• Views: 706
07-24-2014, 11:50 PM
21. ### Factor analysis - Mean = 0 and Std. = 1 ??

Hi guys I hope you can help me! I am dooing a factor analysis in SPSS. I am using principal components, listwise, varimax and extract on...

• Replies: 2
• Views: 1,397
07-24-2014, 05:00 PM
22. ### Maximum Likelihood Estimator - Geometrical Distribution

Do you know a site which gives a step by step solution of finding the MLE for Geometric Distribution? I'm thinking about something like this...

• Replies: 3
• Views: 1,465
07-24-2014, 04:59 PM
23. ### Determine standard deviation from percentages

I have a normal distribution of data with a mean of 0. I know that 80% of the data falls within 3 units of the mean. So 80% of the data is from -3...

• Replies: 4
• Views: 1,542
07-24-2014, 01:44 PM
24. ### Statistical Analysis on Diets - Anyone a fan of Nutritional Sciences? :)

Hello, My study is composed of 4 diets. One is control and the others are 3 different types of fiber. I have a total of 3 subjects for this study....

• Replies: 6
• Views: 1,485
07-24-2014, 09:22 AM
25. ### Looking for datas

Hello, Does somebody know where I can find the mensual evolution of temperature in France from 2000 to 2014 ? Thank you

• Replies: 1
• Views: 1,778
07-24-2014, 03:27 AM
26. ### [ HELP] Employees Absence

Hi everyone, I need a basic procedural help here. I have to analyze the employees absence in a manufacturing firm. I was given the data of...

• Replies: 7
• Views: 1,658
07-24-2014, 02:13 AM
27. ### Help with choosing the right analysis and how to manage a gender-matching variable

Hi there, Thanks for taking the time to read my question, it is very specific and based on a particular problem I've never come across before. ...

• Replies: 0
• Views: 1,097
07-24-2014, 01:42 AM
28. ### Evaluating Ranked lists

Hi, I implemented ranking algorithm to rank relevant documents to a given topic. So the algorithm produces ranked list of documents for each...

• Replies: 0
• Views: 1,234
07-23-2014, 09:37 PM
29. ### 2D Conditional Probability

Question X, Y are two independent random variables with cumulative distribution functions: F_X(x) = {0, x<0; x/3, 0<x<3; 1, x > 3} F_Y(y) =...

• Replies: 2
• Views: 1,612
07-23-2014, 05:00 PM
30. ### Method

Hi, I am a newbie and I want analyse a set of data I have without using regression and correlation. Please can you outline other methods that would...

• Replies: 5
• Views: 1,386
07-23-2014, 01:38 PM
31. ### Confidence Interval help

I am an engineering student working on some research and I am having some trouble constructing a confidence interval. I have various mechanical...

• Replies: 0
• Views: 947
07-23-2014, 01:34 PM
32. ### Joint density distribution and Variance

Hi everyone! I was wondering if there is a way to calculate the joint distribution of two fully correlated variables, both with known...

• Replies: 1
• Views: 1,145
BGM
07-23-2014, 06:41 AM
33. ### Significance when there are no occurrences in one of the variables?

Hi guys! We've been studying the incidence of pigs mounting each other in a group of pigs containing entire male pigs, gilts and castrates and in...

• Replies: 3
• Views: 1,332
07-23-2014, 04:04 AM

I have a set of Likert-type variables that I'm trying to sum up to form a scale. My dataset has around 5000 subjects, and there are about <10%...

• Replies: 0
• Views: 1,171
07-22-2014, 09:43 PM
35. ### Molecular genetics study

Hi Guys, I performed an experiment that is called mRNA poly A tail length assay (MPAT) on three different human tissues including liver, heart,...

• Replies: 2
• Views: 1,464
07-22-2014, 03:06 PM
36. ### MLE for X ~ Exp(λ)

Let (X1, ... Xn) be a random sample from a random variable. Find the maximum likelihood estimator for λ. I know the answer to this but do you...

• Replies: 14
• Views: 13,151
07-22-2014, 07:13 AM
37. ### Calculate Correlation Coefficient

Hi guys, It's been a long time since I have stats in school, and I am trying to find the right answer on google to this, but you might be much...

• Replies: 1
• Views: 1,343
07-22-2014, 06:43 AM
38. ### Hypothesis testing

Could you please explain me how to do this exercise step by step? (http://oi57.tinypic.com/w1tv78.jpg) I know that it is a one-sided test and...

• Replies: 3
• Views: 1,343
07-22-2014, 06:41 AM
39. ### Simple OLS regression coefficient interpretation question

I have my dependent variable Y and two independent variables, X_1 and X_2. Now assume at each point in time I convert each data point into...

• Replies: 1
• Views: 940
07-22-2014, 03:20 AM
40. ### Determining ideal sample size, testing normality in SPSS, bonferroni adjustment

Hello all, I am new to the forum. I had a bit of training in statistics and research, particularly statistics in psychology, but I have some basic...

• Replies: 1
• Views: 1,238
07-21-2014, 10:04 AM
41. ### Volatility of abnormal returns.

Hi all, When employing raw returns, one defines performance volatility as the standard deviation of these raw returns over some prior period (say...

• Replies: 0
• Views: 907
Man
07-21-2014, 08:13 AM
42. ### Chi Square Test, Pre Post Study, Dichotomous Variables, Different Group Sizes

Hi Everybody, I am a medical student. I am doing a Final Year Project (FYP) and need a little help. I must admit to being a novice statistican and...

• Replies: 1
• Views: 3,282
07-21-2014, 06:15 AM
43. ### Power Analysis for finding correlation of two continuous variables

Hi, I'd like to do a power analysis. My data has two variables. My null hypothesis would, I'd think, be that the pearson correlation = 0, and the...

• Replies: 5
• Views: 3,891
07-21-2014, 01:54 AM
44. ### How do I Construct a 95% confidence interval (C.I.) with this formula?

Hi, Im hoping someone can help do this for me. Construct a 95% confidence interval (Using the following formula: 95% C.I. Equals "mean +/-...

• Replies: 14
• Views: 2,964
07-20-2014, 04:42 AM
45. ### Can someone talk me through the very basics of power analysis please?

Hello, I am looking at doing a study. I am told that I need to do a power analysis, even if I can't use the suggested number of participants,...

• Replies: 5
• Views: 1,754
07-20-2014, 02:16 AM
46. ### stats scenario problem - need help!

Hello, New here so sorry if this thread is in the wrong category. I have a simple question with an answer that I cannot figure out. Here is a...

• Replies: 2
• Views: 716
07-19-2014, 03:41 PM
47. ### arima methods and filterind

Hello, What is the effect of filtering data before applying arima methods on a time serie ? What would be the advantages and drawback of...

• Replies: 3
• Views: 1,374
07-18-2014, 03:17 PM
48. ### Statistics to manage doctors' appointments more reliably?

Hello Yesterday, I went to an appointment with an ophthalmologist at a big health care center. I wasn't the first patient, but people go there...

• Replies: 8
• Views: 1,873
07-18-2014, 09:03 AM
49. ### cumulative frequency polygon vs cumulative frequency curve

According to my book Forming a cumulative frequency polygon indicates that you are assuming that the readings are evenly distributed through out...

• Replies: 0
• Views: 1,532
07-18-2014, 01:29 AM
50. ### t-stat and p-value

Dear all, I have estimated several regressions using loop. I have managed to save the estimated alphas as new variables. Now I need to obtain the...

• Replies: 4
• Views: 2,065
07-17-2014, 05:56 PM
51. ### Test the difference between the variance of two proportions

Hello everyone, How can I test the difference between the variance of two proportions? Best, Ale

• Replies: 3
• Views: 1,610
07-17-2014, 02:54 PM
52. ### How much high/low is the variance if a variable?

Hello everyone, How can you determine if a variable has a high variance or not? The variance, the standard deviation and the coefficient of...

• Replies: 1
• Views: 1,073
07-17-2014, 11:06 AM
53. ### Help analyzing result from GLM with a poisson distribution

Can anyone help us analyse the results of this model? We're trying to test if gender ("koen") influences the occurrence of vocalizations see in pigs...

• Replies: 0
• Views: 842
07-17-2014, 09:07 AM
54. ### How to compare total weighted average change in average price of many items?

Hi, I need to compare the average change in prices from 2013 to 2014 for a list of 3000 different products. Below in each spoiler there is...

• Replies: 2
• Views: 1,427
07-17-2014, 09:06 AM
55. ### Interrater Reliability estimate (pearson's r)

Hi All, I am in need of some help. I am trying to determine the correlation of 5 continuous variables to determine the interrater reliability...

• Replies: 1
• Views: 7,254
07-16-2014, 08:11 PM
56. ### What are the advantages of the mean squared error versus the mean absolute error?

I understand the formulas for each, but don't understand the advantages of using one over the other. If you could provide a situation that would...

• Replies: 2
• Views: 9,857
07-16-2014, 10:26 AM

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