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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: 196,581
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: 66,632
09-30-2005, 09:44 AM
1. ### Is hierarchical multiple regression a form of multillevel regression?

Is hierarchical multiple regression a form of multillevel regression? I've tried Googling it, searching on statistic books and I just can't seem to...

• Replies: 15
• Views: 3,799
09-06-2015, 01:26 AM
2. ### Portfolio Risk

My question concerns the calculation of portfolio risk. I want to calculate the portfolio risk from the stocks included in the portfolio....

• Replies: 2
• Views: 1,313
09-05-2015, 09:56 AM
3. ### How to conduct a basic t test for these data?

Hello everyone! So I am supposed to do a t-test. I just need help on how to set it up. The question I am asking is whether poplar or willow...

• Replies: 4
• Views: 1,438
09-05-2015, 03:19 AM
4. ### Multinomial Logistic Regression, Main Effects do not show in SPSS

Hello everyone! I hope someone can help. I am really desperate here. I have two categorical IV's and each IV has 2 levels, so a 2x2 Design. The...

• Replies: 0
• Views: 932
09-03-2015, 10:49 AM
5. ### time series with bivariate data?

I have a datetime (yearly) variable which indicates when/if a subject registered, a count of the 400,000 subjects who registered at each facility and...

• Replies: 0
• Views: 1,207
09-03-2015, 10:42 AM
6. ### What do you call this type of analysis?

I do a lot of statistical analysis at my job but I'm unsure of the terminology for what I do. I work for a lab where we screen every newborn in the...

• Replies: 6
• Views: 1,474
09-03-2015, 09:43 AM
7. ### Non-orthogonal two-factor ANOVA?

How would I go about doing a non-orthogonal two-factor ANOVA? For example, say I'm trying to see if the size and sex has an effect on the...

• Replies: 1
• Views: 1,308
09-03-2015, 07:32 AM
8. ### Homework help

Ebase is a popular online market place in which people and businesses buy and sell a broad variety of goods and services worldwide. Recently, a...

• Replies: 0
• Views: 1,097
09-01-2015, 11:58 PM
9. ### Set up simulation

Dear all I want to replicate a prior research. data: for U.S. firms, many of them are followed by financial analysts, consider firm X that...

• Replies: 0
• Views: 1,069
09-01-2015, 07:44 PM
10. ### An article

Hi all. Hope everyone is great. I must find Raykovs' (1997) article whichs name is ''Estimation of composite reliability for congeneric measure''. I...

• Replies: 0
• Views: 1,136
09-01-2015, 07:26 AM
11. ### Low p values and no transformations indicated for the non-normal data

I'm using a coordinate measuring machine (CMM) to measure every feature on a machined part. The blueprint requires Cpk reporting on each feature....

• Replies: 1
• Views: 1,965
09-01-2015, 06:56 AM
12. ### help required urgent

A sample of 12 homes sold last month in Minot is selected. Can we conclude that as the size of the home (in square footage) increases, the selling...

• Replies: 0
• Views: 1,034
09-01-2015, 01:25 AM
13. ### Loosing variance when using group means or sums

Hello, I have a basic statistics question. My professor mentioned today that when calculating sum or mean scales we lose information about variance....

• Replies: 0
• Views: 1,087
08-31-2015, 10:23 AM
14. ### analyze groups of repeated measures

Hi all, I have the following setup. Several people (male and female) had to rate different pictures. Certain pictures share specific (categorical)...

• Replies: 0
• Views: 968
08-31-2015, 06:26 AM
15. ### Do i use a binomial test- comparison of observed and expected annual event rates

In a study, I found an annualized rate of an event, x=3.2% on treatment A (93.4 patient years of follow up) . Expected rate of the event is 6.7% per...

• Replies: 2
• Views: 1,175
08-31-2015, 03:46 AM
16. ### Statistics Problem Help

Hi guys, I'm doing a small assignment and need some help. I'm given data of people at a workplace who have gotten a flu vaccination. The data is...

• Replies: 0
• Views: 1,231
08-30-2015, 04:19 PM
17. ### help required urgent

A national grocer's magazine reports the typical shopper spends eight minutes in line waiting for checkout. A sample of 24 shoppers at the local...

• Replies: 0
• Views: 1,341
08-30-2015, 01:59 PM
18. ### Calculate population cumulative probability from sample

Hi all, I am currently working on an assignment that involves inferential statistics. Basically, I am given a sample of 30 people with their heights...

• Replies: 0
• Views: 994
08-29-2015, 10:29 PM
19. ### Please confirm: how to calculate critical range in tukey-kramer

I am doing a tukey-kramer procedure, and my results seem off. I suspect maybe it is my critical range. I am getting it this way. Q x...

• Replies: 0
• Views: 2,316
08-29-2015, 12:40 PM
20. ### Basic Question: Addition of Percentages

Hello, and thanks to those who built and maintain this forum. On another site, I encountered the following statement: Is it statistically...

• Replies: 3
• Views: 2,688
08-29-2015, 05:51 AM
21. ### [Prism 5] Gather or Individual Analysis? ANOVA or Kruskal?

To whom it may help: My research is on cellular/molecular responses after hormones farmacological administration and I'm not quite sure how to...

• Replies: 13
• Views: 2,188
08-28-2015, 08:49 AM
22. ### Get Accurate Values from Etrade website! Hellp PLZ

Dear All I have just stuck in the first step of my statistics assignmet which make me not able to continue, i just need to take out the proper data...

• Replies: 0
• Views: 1,314
08-28-2015, 05:32 AM
23. ### doing some questions and really not sure what to do.

(a) The average life of a certain compressor is 10 years. The manufacturer replaces all compressors that fail (and cannot be repaired) within its...

• Replies: 1
• Views: 1,278
08-27-2015, 08:49 AM
24. ### Problems presenting my analysis

Hi all ! :) I am doing my thesis right now, and I'm working on some Twitter pages. I have my statistical analysis done for each of them, but I...

• Replies: 6
• Views: 1,793
08-27-2015, 03:28 AM
25. ### Bartlet and KMO

Hello everyone, I am new memeber in this site. I have a question. I would like to do exporatory factor analysys. Before doing it, it si...

• Replies: 3
• Views: 1,289
08-26-2015, 08:05 AM
26. ### Relationship Test of Paired Data with one variable ordinal, other binomial

I want to find relationship between a "priority value" and "billable status." The priority value is a numeric value that is an integer in the set...

• Replies: 4
• Views: 1,503
08-26-2015, 06:52 AM
27. ### Need help understanding conditional distribution!

Hey everyone, thank you for taking the time to have a look at my problem, first of all. This I believe is a fairly simple question for most, but I...

• Replies: 0
• Views: 1,135
08-26-2015, 12:02 AM
28. ### Confidence Intervals

Hello Everyone, Is it possible to have confidence interval for a probability of 0? For instance, a random sample of 40 persons were asked if they...

• Replies: 9
• Views: 1,142
08-25-2015, 02:12 PM
29. ### What variable explains best

Hello! I am doing a master thesis and is having problem to find out which of my variables that explains the variance. Unfortunately i am a real...

• Replies: 0
• Views: 938
08-25-2015, 09:07 AM
30. ### Sampling

I am unsure when it is sensible to use Quota sampling or Stratified Sampling? I have a situation where I have a population of students: Junior...

• Replies: 1
• Views: 1,427
08-25-2015, 07:49 AM
31. ### Which test is suitable?

Dear all, I'm struggling on selecting the correct test for the following data: I have three groups of people (A,B,C) which have been tested on two...

• Replies: 2
• Views: 1,377
08-25-2015, 04:01 AM
32. ### Mediaton Analysis

Hey people, I am trying to find an appropriate mediation analysis method. I want to investigate how an INTERACTION of two variables mediates the...

• Replies: 4
• Views: 1,532
08-24-2015, 09:27 PM
33. ### Imputation

Dear all: I am working with data from a large cohort study in which participants were asked, retrospectively, about their work history. Data are...

• Replies: 1
• Views: 2,101
08-24-2015, 04:52 PM
34. ### Finding difference between variables - Which test to use ?

Hello, Currently I am pursuing a degree in Psychology through distance mode. I am studying on my own as of now and taking help of internet. The...

• Replies: 3
• Views: 1,434
08-24-2015, 03:28 PM
35. ### How to correct the means of a variable in 4 groups matlab

I compute the mean of the variable Y in 4 groups (A B C D) that differ for age, gender and body mass index (BMI). n=89 | ...

• Replies: 0
• Views: 996
08-24-2015, 10:37 AM
36. ### Working with Ranges of Values

Hi, I have data where a variable is categorical, but represents a range of prices so if = 1 then \$1.00 - \$1.99 if 2 then \$2.00 - \$2.99 if 3...

• Replies: 0
• Views: 1,187
08-23-2015, 02:47 PM
37. ### Probability of Getting a Hit

I used to be very good with statistics. I minored in quantitative business analysis (majored in CMP SCI) but that was many years ago. Here's my...

• Replies: 2
• Views: 1,516
08-23-2015, 09:56 AM
38. ### Are Unbiasedness and Accuracy of the estimates, all to determine the sample size?

For determining sample size , why is to focus on the unbiasedness and accuracy of the estimates ? Are this two properties, unbiasedness and...

• Replies: 0
• Views: 789
08-23-2015, 03:32 AM
39. ### Statistical/ML models when observations have different amounts of input

Let's say we're predicting an employee's performance review score for the following year based on that emplyee's metrics from each previous year of...

• Replies: 0
• Views: 1,129
08-22-2015, 07:34 PM
40. ### Calculating the life time value of an app user

Based on the following: New users that Day: 22304 Interstitial ecpm: \$15.20 Interstitial/day: 1.8 Day 1 retention: 45% Day 2 retention: 39.93%...

• Replies: 0
• Views: 1,307
08-22-2015, 04:09 PM
41. ### Primary Maths

I studied long enough to work out how accurate polls are and if a lead is statistically significant, but I can't find a way to apply this to an...

• Replies: 0
• Views: 1,089
08-22-2015, 09:31 AM
42. ### Comparison in incidence between two populations

Hello Everyone I am trying to compare the incidence in two types of procedures between 2005 and 2012. Bascially, my first data set is: Number of...

• Replies: 0
• Views: 747
08-21-2015, 05:22 PM
43. ### Generating random data from correlations

Say I have a list of personality traits: courage, materialism, compassion and so on. I interview some people and assign a rating from -10 to +10 to...

• Replies: 2
• Views: 1,202
BGM
08-21-2015, 08:42 AM
44. ### A Statistical Test Learning Rate?

First off, I apologize if I am creating a new thread for something that already exists. I used the search option, but didn't find anything that...

• Replies: 0
• Views: 1,093
08-21-2015, 08:17 AM
45. ### Extending sample results to the population - a real world problem

Hi, This is a real world problem. In a sample of 2000 people which is representative of the population of a state (in terms of gender, age, race...

• Replies: 2
• Views: 1,550
08-21-2015, 04:19 AM
46. ### How to Compare the Difference of a Change in Proportions

I have patient data collected from intervention hospitals and control hospitals at two points in time. I am interested in looking at survival (and...

• Replies: 1
• Views: 930
08-21-2015, 02:36 AM
47. ### SPSS: Mixed design ANOVA or paired sample t-test for both groups separately

------Dears TalkStats, Your help is highly appreciated! :) ------- I want to test wether the decrease in sleep quality of my sample is different...

• Replies: 3
• Views: 1,397
08-21-2015, 02:34 AM
48. ### Noob: combine Mean/CI's from two periods, same population?

Complete novice here :o (allied health student): Is there a simple way for me to extract a single Mean/CI from two given for separate, consecutive...

• Replies: 0
• Views: 1,232
08-20-2015, 04:30 PM
49. ### What does min in curly brackets mean?

I'm looking a t a expression which says g=min{f,1} where g and f are functions - what does this mean?

• Replies: 1
• Views: 1,554
08-20-2015, 01:59 PM
50. ### Paired vs Unpaired, just need reassurance on my thoughts

Hi, first of all I'm new around here, I did some search, found some threads with similiar questions, but in the end I would like to ask for help in...

• Replies: 0
• Views: 1,246
08-20-2015, 09:47 AM
51. ### test and train dataset

As I'm new to R ,can anyone please explain me about test and train dataset with a sample example with output and how to split data into test and...

• Replies: 0
• Views: 1,290
08-20-2015, 05:31 AM
52. ### conformal prediction

# loading some necessary basic machine learning algorithms and R liabaries require(randomForest) require(e1071) ############# Some necessary...

• Replies: 0
• Views: 749
08-20-2015, 05:24 AM
53. ### Chi square Or Mann U Whitney for comparing student grades

Hi, for my study I have obtained the UK classification grades that are used at University. I've obtained data from two groups of students first...

• Replies: 1
• Views: 2,085
08-19-2015, 10:52 AM
54. ### Excel Formula for ranking products

Hi, I want to score a long list of products based on their volatility of quantity sold in the last 12 months. for example, if prod A gets...

• Replies: 0
• Views: 1,709
08-19-2015, 04:27 AM

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