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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: 196,824
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: 66,794
09-30-2005, 09:44 AM
1. Which test to use?

Hello everyone, I have three sets of data, each of which consists of hundreds of trials with 7 choices apiece. The outcome is binary - success pr...

• Replies: 1
• Views: 1,153
06-01-2014, 09:06 PM
2. How do you know if you're making a Type I or Type II error?

Type I and II errors seem really theoretical. In real life, how would you ever know if you're making a Type I or Type II error? Can anyone provide...

• Replies: 3
• Views: 889
06-01-2014, 06:52 PM
3. Age groups

How can I make age as an ordinal (categorical) variable? I work on the sample composed of Youth. 17-23, 24-30, More than 30 years old. What can I...

• Replies: 5
• Views: 1,762
06-01-2014, 12:22 PM
4. Healthcare applications

I work in healthcare and I was wondering what sort of analytics/modeling projects members of this forum are doing. I guess it would be nice to see...

• Replies: 0
• Views: 1,038
06-01-2014, 10:46 AM
5. Central limit theorem and prediction theory

Hi, My econometrics teacher asked this question a couple of days ago which is at the same time a potential question for the exam: "Why does CLT...

• Replies: 1
• Views: 1,852
06-01-2014, 09:53 AM
6. How can you prove normal distribution enough to use e.g. ANOVA not Kruskal Wallis?

Hi everyone, I'm trying to produce an automated framework for choosing hypothesis tests and carrying them out. I really am new to statistics so...

• Replies: 2
• Views: 1,576
06-01-2014, 01:50 AM
7. Combing Two Indexes into One Index

I want to use two survey questions to measure satisfaction level with the following responses: Question 1: very satisfied (highest score),...

• Replies: 0
• Views: 890
06-01-2014, 01:25 AM
8. Confidence intervals for eta squared?

Hello, is it possible to calculate confidence intervals for eta-squared manually? I found a paper which lists the formula for this:...

• Replies: 0
• Views: 2,217
06-01-2014, 01:04 AM
9. Evaluating differences between repeated measurements of one group to another

I'm having difficulties understanding what type of statistical testing I need for my questions. My measurements include the following: Organism 1 ...

• Replies: 0
• Views: 1,012
05-31-2014, 05:16 PM
10. Which test to use?

Hello - I think I have a fairly straight forward statistical analysis to perform, but I am really unsure which method to use. I have 2 variables...

• Replies: 1
• Views: 1,478
05-31-2014, 03:46 PM
11. Use Excel to analyze my Product characteristics to select which products will sell

Hi - I am trying to analyze my numerous products to determine which ones are best to list in the future. Last year I listed about 13,000 products,...

• Replies: 2
• Views: 2,292
05-31-2014, 03:37 PM
12. ordinal scale - rate of importance - which test to use?

Hey All, I new here. So excuse me in case of any mistakes in posting. As for my problem, I am doing an analysis of factors that influence...

• Replies: 1
• Views: 1,120
05-31-2014, 03:30 PM
13. query in non parametric test

If we want to see whether the variance in the temperatures in the month of June is same in two cities, (assume that the temperature is normally...

• Replies: 1
• Views: 1,089
05-31-2014, 03:11 PM
14. Standard deviation of difference of means

Hi, I am sorry of this stupid question :confused: I would like to know if it possible to calculate the standard deviation of a difference of...

• Replies: 5
• Views: 1,734
05-31-2014, 02:49 PM
15. difference between 1m rolling and 1m trailing data

Hi This is probably a basic question, but I am looking to get returns data on some investment portfolios. I need monthly discrete returns for...

• Replies: 1
• Views: 2,614
05-31-2014, 02:14 PM

As a newbie in statistics i need to understand what type of statistical tests to use in my research?

• Replies: 7
• Views: 2,973
05-30-2014, 05:42 PM
17. Central limit theorem and prediction theory

Hi, My teacher for an econometrics course asked the following question and I don't know what to answer: I thought it was the other way...

• Replies: 2
• Views: 2,068
05-30-2014, 02:25 PM
18. Statistical Significance Testing

Hello! I'm hoping for some help. I'm trying to determine if any data sets in a group are more or less significant than the others in the set at the...

• Replies: 1
• Views: 819
05-30-2014, 11:28 AM
19. UV Data Averages Quality?

Hi all, Joined this forum to ask perhaps a basic question, but I hope someone will be able to help. I have two sets of data that I would like...

• Replies: 2
• Views: 1,021
05-30-2014, 10:31 AM
20. Sample size required to detect a difference between proportions

Hi guys, I've been having a bit of trouble with calculating a sample size to detect a difference. The question asks what sample size would be...

• Replies: 0
• Views: 1,044
05-30-2014, 08:58 AM
21. Dealing with data where the values of variable Y depend on values of variable X

Hi there, I've been doing some undergrad research and am confused about how to handle some of my data (and my professor doesn't know much about...

• Replies: 0
• Views: 1,389
05-30-2014, 07:19 AM
22. Predicting count dependent variable

I am trying to model a count dependent variable (0~60) with excessive zeros. The range of data is quite large, unbalanced and unbound, so...

• Replies: 0
• Views: 1,821
05-30-2014, 03:23 AM
23. Minimum Sample Size Required

I am a total novice...I do hope you can help! 100,000 people usually shop in Store X. But, only 50,000 people shopped in Store X in Period Y....

• Replies: 0
• Views: 605
05-29-2014, 07:58 AM
24. Transforming data?

I am regressing Volume against price of futures. My question is do I have to transform both of the data into percentage change or not? R square is...

• Replies: 0
• Views: 841
Att
05-29-2014, 03:03 AM
25. Help me

hi to all, I need help with my homework. I am a Erasmus student and I have to write 10 pages about " Why we study descriptive statistic; what...

• Replies: 0
• Views: 1,119
05-29-2014, 02:13 AM
26. Effect of Unequal Denominator when Comparing 2 Ratios/Percentage?

Hi all, I've been trying to find the answer for this for quite a while, but I have yet to have any luck in finding it out. Basically if we are...

• Replies: 2
• Views: 2,283
05-29-2014, 12:57 AM
27. Help me out in understanding this output

Hello, I'm new to SAS as well as forums. Kindly help me understand this simple output. Here are the two datasets dataset - emp ...

• Replies: 5
• Views: 1,662
05-28-2014, 09:22 PM
28. Need help with Question 3 please, theres like 6 of us aruging about it.

Q3) Does the distribution of emails between days differ between group members? Include a graphical comparison which shows the proportions on each day...

• Replies: 1
• Views: 1,146
05-28-2014, 08:47 PM
29. Statistics for model validations

Hi. I have two models: with observed data (target model) and a generated synthetic model (output model). They are 20 by 20 cells where each cell...

• Replies: 0
• Views: 1,139
05-28-2014, 04:31 PM
30. Help Me Please, I have No were else to turn :(:(

So I have 3 questions to complete, please help me, I think I know what i am doing but really not 100% sure. Here is my Data The 5 vectors are...

• Replies: 2
• Views: 1,464
05-28-2014, 02:35 PM
31. Confidence of Distribution

Hi all, say I have a known normal distribution, which was created by an experiment. Now, I take another measurement, one only, and assume this is...

• Replies: 2
• Views: 1,362
05-28-2014, 11:21 AM
32. Comparing two groups with multiple measurements of the same variable

Dear anyone I am monitoring symptoms (continuous scale, normally distributed) in patients two groups (one gets the treatment and the doesn’t). The...

• Replies: 0
• Views: 2,575
05-28-2014, 09:18 AM
33. Statistical power and confidence level?

Hello I need help understanding why statistical power = 1-beta, doesn't a .05 significance level mean there it is 95% confidence level (1-a) that the...

• Replies: 2
• Views: 2,003
05-27-2014, 05:33 PM
34. Y~N(1,0.5) and W= Y^2, what is the moment generating function of W?

I think it's something to do with the Non central Chisquared distribution but I'm not sure how to use it and derive the mgf of W? Would someone show...

• Replies: 2
• Views: 1,616
05-27-2014, 03:40 AM
35. Krippendorff KALPHA help!?

Hi, I'm currently undertaking a project which requires content analysis of US print press in order to explore whether international terror events are...

• Replies: 2
• Views: 4,471
05-27-2014, 03:39 AM
36. Normality of Demographic variables

Hi, for the study having two sets of variables : 1. measured demographic 2....

• Replies: 1
• Views: 1,249
05-26-2014, 05:56 AM
37. Having some problem with simple least squares regression qs

Hi, this is fairly simple stats stuff but I'm completely lost on how we can get R^2 and SSR from the data we have. Would appreciate any pointers here...

• Replies: 1
• Views: 1,451
05-25-2014, 04:59 PM
38. 2 (Easy) Regression Questions

Hi guys. I just joined Talk Stats. So I recently just returned to school after being hit by Crohns' Disease for a year, and I was wondering if you...

• Replies: 0
• Views: 3,081
05-24-2014, 09:38 PM
39. statistical significance betwee 2 groups

Hello all, I'm trying to analyze data from 2 different groups for statistically significant differences and could definitely use some help here....

• Replies: 1
• Views: 1,000
05-24-2014, 07:41 AM
40. chi-square and multiple testing

Hi, I want to compare survey responses for a particular survey questions between one year and the next - to see if there is a statistically...

• Replies: 8
• Views: 1,944
05-23-2014, 02:42 PM
41. Sensitivity/Specificity: determining confidence intervals for a small sample size

I'm conducting a study to determine the validity of a diagnostic test, by comparing its results to a reference standard. The variables I'm dealing...

• Replies: 0
• Views: 2,403
05-23-2014, 06:59 AM
42. Question on standard error

I'm reading "Statistics in Plain English" by Tim Urdan and I'm really enjoying it, but this part is causing me alot of confusion: My...

• Replies: 3
• Views: 1,258
05-23-2014, 01:48 AM
43. computing maximum likelihood for GBM models

I am running some analyses with a group of models to make a final ensemble of predictions. I am using GBM, GAM and GLM. I can calculate AIC value for...

• Replies: 0
• Views: 1,099
05-22-2014, 09:56 AM
44. Reporting a backward elimination regression

Hi I wondered if anyone could tell me how to report a backward elimination regression (i.e. how much information to include). The model has taken...

• Replies: 0
• Views: 1,893
05-22-2014, 09:48 AM
45. Which test to choose (LIKERT scale/ and mix of ordinal data)

Hello, Luckily I found this forum, I need some confirmation for choices I made regarding the tests I am willing to do for my master thesis. My...

• Replies: 0
• Views: 892
05-22-2014, 04:02 AM
46. Calculating SD for data with many zeros

Hi all, I have multiple datasets with lots of zeros. Some are counts, others are percentages, but none of them can have negative values. When...

• Replies: 9
• Views: 4,249
05-21-2014, 11:11 PM
47. Power Analysis and its intepretation

Dear all, This is a real study and with minimal statistics background I am helpless. Recently I am doing a research study. However, when doing...

• Replies: 1
• Views: 1,123
05-21-2014, 08:37 PM
48. 4 treatment types, four possible outcomes, and ran experiment 3 times

I am circling through choices of analyzing. I have a ran the experiment 3 times and the same similar numbers come up for each experiment. The...

• Replies: 0
• Views: 1,262
05-21-2014, 07:07 PM
49. I need help calculating the Tukey's HSD statistic (two way anova 25x2)

hello:) I need to calculated the Tukey's statistic for 25x2 and 200 degrees of freedom please....I'm confused determine the value of k to...

• Replies: 0
• Views: 1,189
05-21-2014, 12:14 PM
50. Volatility of Currencies - Use F-test?

I've been given a question to compare given data sets of monthly exchange rates (over a 10 year period so the sample size is 120) of 4 different...

• Replies: 0
• Views: 1,866
05-21-2014, 11:08 AM
51. Is only 1 item in 1 factor possible (factor analysis)

I have three factors, of which factor 1 and 2 have several items loading on them. However, factor three has only 1 item. Is this possible or is it...

• Replies: 0
• Views: 1,127
05-21-2014, 08:58 AM
52. Which Statistical model to use ?

Dear all, I am new to statistics and i have a confusion. I have one dependent variable (y) and multiple independent variable (xi). However, the...

• Replies: 1
• Views: 1,194
05-21-2014, 07:20 AM
53. tool to use for Datamining

Hi Which statistical tool will be the best for MIS and data mining for data running into a million customers. As the need will be continuous, can...

• Replies: 1
• Views: 922
05-21-2014, 06:37 AM
54. Null Hypothesis

Hey, I am having troubling trying to figure out how I would write this for the null and alternative hypothesis. Any help would be appreciated ...

• Replies: 7
• Views: 2,127
05-20-2014, 09:59 PM
55. Mean and SD of proportions

I have done a search of the forum with no luck. I wish to determine the density per hectare of a particular plant and I have sampled 37 areas each of...

• Replies: 1
• Views: 1,286
05-20-2014, 05:10 PM

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