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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: 197,166
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: 66,954
09-30-2005, 09:44 AM
1. ### How can I figure out the raw score of this data set?

I must find the raw scores, z-scores, T-scores, and percentile ranks. Note: the Mean = 50, SD = 5. Raw z ...

• Replies: 1
• Views: 1,974
06-11-2015, 07:32 AM
2. ### Dummy variable stata13

Hi, I want to generate a new variable Turnover by genTurnover. I want to do that by compare the name of this year with the previous year. So my...

• Replies: 0
• Views: 973
06-11-2015, 06:18 AM
3. ### Overlap between groups

Hi everyone, I need some help on how to test overlap between two groups (men with sexual pain and men with sexual dysfunction) on their sexual...

• Replies: 2
• Views: 1,305
06-11-2015, 05:14 AM
4. ### How do risk models deal with state changes over time?

Let's say you are trying to predict if a machine is going to explode (0) or successfully complete its job (1), and you are trying to determine the...

• Replies: 0
• Views: 985
06-10-2015, 12:12 PM
5. ### Spss

Can anyone give me advice please? Where can I run SPSS online?:)

• Replies: 2
• Views: 1,132
06-10-2015, 04:04 AM
6. ### Regression Theory with pairs of points (xi,yi)

i = 1, ..., n Show that SUM(xi - xbar)(yi - ybar) = SUM(xi - xbar)yi Seems straightforward enough, just having trouble getting started.

• Replies: 3
• Views: 1,696
06-09-2015, 06:28 PM
7. ### Stata 14

Where can I run Stata 14 online please???:)

• Replies: 0
• Views: 2,040
06-09-2015, 12:46 PM
8. ### Picking up a sample size of customers the statistics way?

Dear members, I have a large group of our customers who have transacted with us once. I would like pick up a sample group of customers from...

• Replies: 4
• Views: 1,447
06-09-2015, 02:29 AM
9. ### Correlation conundrum

Hi there, New to this forum, sought it out because I am having real trouble understanding what is going on with this weird correlation I am...

• Replies: 4
• Views: 1,431
06-08-2015, 12:38 PM
10. ### Merging continuous variables with categorical variables, yay or nay?

I have a question regarding scales of measurement. In my data set, I have both categorical, dichotomous, and continuous variables. All of those...

• Replies: 4
• Views: 1,856
06-07-2015, 08:06 PM
11. ### Simple Random Sampling Question

Each of 10000 shelves in a certain library is 300 cm long. To estimate how many books in the library need rebinding, a librarian takes a sample of 50...

• Replies: 1
• Views: 2,585
06-07-2015, 04:51 PM
12. ### Testing for differences in productivity

Hi guys, Given a sample dataset like this: Machine Units Produced Time taken A 100 2 A 200 3...

• Replies: 1
• Views: 940
06-07-2015, 10:52 AM
13. ### Modeling dependencies

Hi everybody I am looking for a method to assess the dependencies between random variables (Cross sectional data) And I know that I can use...

• Replies: 7
• Views: 1,722
06-07-2015, 02:23 AM
14. ### Categorical predictors in heiarchical regression

Hi, I am having trouble understanding how to interpret categorical predictors in a hierarchical multiple regression. I know that categorical...

• Replies: 2
• Views: 1,482
06-06-2015, 11:02 PM
15. ### Binomial Random Variables

Hey guys! I'm having some real trouble with these questions. Any help would be greatly appreciated! Thanks in advance (: 1.) A baseball player has...

• Replies: 1
• Views: 3,760
06-06-2015, 11:43 AM
16. ### compare curative rate of two populations

Hi, i have 2 populations. 1 of them are from 2007-2009. In this population 28% received curative treatment (90 persons). Another population from...

• Replies: 3
• Views: 1,303
06-05-2015, 07:01 PM
17. ### What test to compare males vs females?

Hi. I have a sample of children with a condition, lets say asthma. so I have n=100, but I have 75 girls and only 25 boys. Can I use a...

• Replies: 4
• Views: 1,582
06-05-2015, 09:02 AM
18. ### Wilcoxon Signed Rank Test in Splus

I'm trialing Wilcoxon signed rank in Splus with similar data. In my trial data it shows me the following signed-rank statistic statistic V = 107, n...

• Replies: 0
• Views: 1,121
06-05-2015, 12:58 AM
19. ### Distribution

Hi, I am trying to figure out what kind of distribution represents the following scenario. If i randomly distribute something of size N among M...

• Replies: 1
• Views: 1,210
06-04-2015, 07:31 PM
20. ### Paired t-test Confusion. Data not normally distributed?

Hello, Would somebody be kind enough to confirm the appropriate test to compare what was found in the stomach of a toad against what was found to...

• Replies: 4
• Views: 2,150
06-04-2015, 03:29 AM
21. ### Different results by adding a third group?

Hi, In my study I first only compared two different groups (1 and 2) on a number of variables. For one variable in particular, these groups were...

• Replies: 0
• Views: 1,208
06-04-2015, 02:37 AM
22. ### Testing if means are different and reporting on that usng R t.test

Lets say I have the 4 means that are the average response time for some variable: Response Time A .12 B .16 C .65 D ...

• Replies: 1
• Views: 1,095
06-03-2015, 03:38 PM
23. ### statistical sampling plan

I have a lot size of 120 cases. Each case contains 10 pieces so the total number of pieces is 1200. I want to take a warehouse sample to see if...

• Replies: 1
• Views: 1,016
06-03-2015, 12:23 PM
24. ### Need quick help for completing thesis in time

Under statistical analysis this was the revised statement from my professor i cant understand what the % of cases mean ? Is it the number of...

• Replies: 0
• Views: 1,087
06-03-2015, 11:21 AM
25. ### Calculate a sample size to 80% power

Hi. I want to compare the efficiency of a light meter against other light meter. I have different lamps with different lights intensity so i can...

• Replies: 4
• Views: 2,647
06-03-2015, 11:15 AM
26. ### Patametric vs nonparametric test

Hi Guys, I've finished a project, where I had 700 customers and compared their results before treatment was applied and after that. I used ...

• Replies: 0
• Views: 1,088
06-03-2015, 07:46 AM
27. ### Unequal sample sizes

Hi all, I would like to compare the means of two groups, one group has 6 samples and the other has 4 samples, can I used a unpaired t-test or...

• Replies: 5
• Views: 2,005
06-03-2015, 03:29 AM
28. ### F-test for the Presence of Seasonality

hello everyone, can you help me? what are the assumptions for f-test for presence od seasonality? are they the same as for normal f-test (normal...

• Replies: 0
• Views: 1,992
06-02-2015, 08:49 AM
29. ### Testing differences in effects across groups: pwcompare (effects) with bin. logit

Dear Ladies and Gentlemen For my thesis I try to compare individual determinants for the preference for redistribution between Swedish and Swiss...

• Replies: 0
• Views: 2,382
06-02-2015, 08:26 AM
30. ### Comparing two estimated distributions

I estimated the density function (adaptive kde) from two samples (one of small size) and the cdf using approxfun() and integrate() in R. Now, I would...

• Replies: 1
• Views: 1,168
06-02-2015, 07:17 AM
31. ### How to check if two categorical variables are related (in a two-way table)? Confused

Hi, My question might seem pretty dumb but I'm teaching statistics to myself and never had in school or uni. I use a book and I'm currently trying...

• Replies: 2
• Views: 2,144
06-02-2015, 01:27 AM
32. ### [R] Prevalence by site. Stuck after fisher.test and pairwise.t.test

Hi, I run into a problem I can't solve and I got stuck doing the pairwise.t.test. I'll try to give you as many details I could so maybe you can...

• Replies: 0
• Views: 1,015
06-01-2015, 08:46 AM
33. ### 2 x 9 Chi-square analysis

Dear all, I am hoping for some advice/guidance on my statistical output. I have run a chi-square test in SPSS on a 2 x 9 grid. The output indicates...

• Replies: 1
• Views: 1,178
06-01-2015, 04:33 AM
34. ### Data intepretation

Hi all, i want to ask another question about data interpretation. Assuming that let say the rate of goods being moved into the warehouse is...

• Replies: 6
• Views: 2,284
06-01-2015, 04:30 AM
35. ### Probabiloty and distribution help

1. For quality control purposes, a company that manufactures copper sheets routinely takes samples from its production process. Since its product is...

• Replies: 2
• Views: 10,806
05-31-2015, 01:26 PM
36. ### Please help, interpreting coefficients

The question is b. In context, interpret the coefficients in the regression equation. What do they tell us about the relationship between CO2...

• Replies: 5
• Views: 2,022
05-31-2015, 05:50 AM
37. ### ANOVA normality

Hello all, a quick question on checking normality before applying ANOVA - Just have 3 groups in the ANOVA model, therefore, checking whether data...

• Replies: 4
• Views: 1,861
05-30-2015, 04:07 PM
38. ### Interpretation of pcorr -> sources

Dear forum :-) I've been searching around for half an hour now, trying to find information about interpreting the pcorr command in stata. I...

• Replies: 0
• Views: 1,099
05-30-2015, 10:53 AM
39. ### T-test - dependent samples? repeated measures?

Hello, I'm working with biological data that was sampled over different days. Because of the methods, it's likely that a minority of the data points...

• Replies: 4
• Views: 1,264
05-30-2015, 04:07 AM
40. ### Correlating Means with varying sample size

Hi all, I have a problem that I think should be simple, unfortunately I don't know how to search exactly what I am looking for. I have the mean...

• Replies: 4
• Views: 1,267
05-29-2015, 08:36 PM
41. ### HLM Longitudinal Analysis with 2 Time Points

Does longitudinal HLM with only two time points differ radically from linear growth curve modeling? I know Raudenbush says you need 3 or more...

• Replies: 0
• Views: 1,149
05-29-2015, 06:38 PM
42. ### ECG Database Analysis

Hello, I'm analysing a set of 400 ECG signals (each one of a duration of 30 sec). I want to get the mean signal of all my signals but I don't...

• Replies: 1
• Views: 1,254
05-29-2015, 12:26 PM
43. ### Using single items as predictors for a logistic regression

Hello! I'm conducting a logistic regression analysis for a project that has an absolutely awful research design, and I'm considering removing the...

• Replies: 1
• Views: 1,802
05-29-2015, 02:36 AM
44. ### Looking for help with the Mann-Whitney U Test

Hey, I'm a highschool student finishing up with AP Statistics. In my final project, I am using the Mann-Whitney U Test to compare two un-normal data...

• Replies: 3
• Views: 1,697
S^4
05-28-2015, 09:03 PM
45. ### Differences in the p value from t-test and post hoc tests after ANOVA

Hello! I would like an explanation with differences regarding the p value which i observed when i perform t-test and post hoc tests. I have to...

• Replies: 4
• Views: 3,905
05-28-2015, 09:22 AM
46. ### Find Standard Deviation/ Standard Error for an unusual trend

Hi everyone. Got a bit issues in this , hope if anyone can give me any suggestion on how to find the Standard Deviation/ Standard Error in this...

• Replies: 0
• Views: 1,598
05-28-2015, 02:25 AM
47. ### software speed

Not homework BTW ... I want to measure the processing time (performance) of some software under a set of fixed conditions. I have a means to log the...

• Replies: 7
• Views: 1,928
05-27-2015, 08:44 PM
48. ### Pearson's, Spearman's and R squared

Hi, I'm sure this is super easy but I can't seem to find the answer anywhere. I am looking at the linear relationship between height (cm) and...

• Replies: 2
• Views: 1,924
05-27-2015, 01:52 PM
49. ### Paired t-test and control variables?

Hey :) So I have the following data: 160 participants filled out a survey in which the first rated one product, then another. Now I want to...

• Replies: 2
• Views: 3,728
05-27-2015, 01:44 PM
50. ### Which test should I use?

I have been trying to find the test that I can use to analyze my data, but I'm not sure if I'm heading in the right direction. There are total of...

• Replies: 2
• Views: 3,594
05-27-2015, 10:46 AM

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