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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: 196,807
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: 66,786
09-30-2005, 09:44 AM
1. ### Factors influencing a nominal variable

Thank you in advance for your assistance in this! I have a dataset set up with a variable, agreement (coded 0) or disagreement (1), for each case...

• Replies: 0
• Views: 881
02-18-2015, 09:51 AM
2. ### 3 values ordinal variable: Mann-Whitney or Chi-squared?

Hello, I have an ordinal variable which assumes only 3 values. I need to do a comparison between 2 treatments. I used Mann-Whitney test, since...

• Replies: 9
• Views: 2,271
02-18-2015, 05:46 AM
3. ### How to find the t-value and probability

Given that the parameter estimate is -5.0 and the STD. error is 1.443 how do I find the t-value and probability? The other information in the chart...

• Replies: 2
• Views: 1,278
02-17-2015, 02:57 PM
4. ### One predictor (interval) and multiple response variables (interval) - testing a model

Hi, I have one variable measured on a interval (Likert 5-point scale) that is hypothesized to be a predictor of several other variables (also...

• Replies: 4
• Views: 2,298
02-17-2015, 07:51 AM
5. ### signs changes

Hi, I am working on a model that should be in terms with what I observe. Therefore I am adding variables that in theory should be significant. But...

• Replies: 1
• Views: 1,345
02-16-2015, 04:03 PM
6. ### Test how accurate my table is?

Hi. I have a table of sportsmen with stats corresponding to each. One stat is the probability of each of them winning. How could I test my table...

• Replies: 1
• Views: 1,438
02-16-2015, 11:16 AM
7. ### goal: why cumulative % exceeds 1 when I do principal axis factoring in STATA

Hi, I surfed the net only to find reasons why it could exceed 1 if I use ipf or pf rotation for exploratory factory analysis. How about principal...

• Replies: 0
• Views: 1,163
02-15-2015, 11:38 PM

Hi, I'm a bioscience student - stats are not my strength - and I'm trying to analyze some data on R (which I am using for the first time) and I'd...

• Replies: 13
• Views: 2,120
02-15-2015, 12:51 PM
9. ### What if...partial correlation is bigger than zero-order correlation?

Hi everyone, I'm not a statistics-expert, but (shame on me) I'm a teaching assistant for an introductory course of statistics. I always thought...

• Replies: 1
• Views: 1,760
02-14-2015, 01:35 PM
10. ### Fairly simple z table normal distribution question

Question: the following are the tax refunds from a population of people who had Anderson and Anderson complete their tax returns: 189 765 996...

• Replies: 3
• Views: 3,621
02-13-2015, 11:23 PM
11. ### likert items questionnaire

Dear all, I would like to ask for some advice regarding the data of a questionnaire i sent out. The questionnaire comprises 10 categegories. Each...

• Replies: 3
• Views: 1,695
02-13-2015, 01:43 PM
12. ### What is the correct test? dates included

Hello, I have a table with dates (every day, ascending order), where each row is the flowing day, and a column with number of expressions....

• Replies: 0
• Views: 2,058
02-13-2015, 08:04 AM
13. ### Randomized trial sample size CALCULATION - help please

Could you please help me understand how did they calculate the sample size in this randomized trial ? It is a randomized trial comparing the use...

• Replies: 1
• Views: 1,139
02-12-2015, 11:31 AM
14. ### Combining two standard errors for a ratio

Hello Stats people! I'm trying to compare two ratios (A1/B1 vs. A2/B2), and only have the means of A1 A2 B1 B2, and the Standard Error of each...

• Replies: 0
• Views: 1,066
02-12-2015, 11:09 AM
15. ### Factor analysis (pcf) and linear regression

Der all, I've got a general question on factor analysis using principle-component-factors in Stata in order to check for the validity of the...

• Replies: 5
• Views: 1,710
02-12-2015, 09:10 AM
16. ### ANOVA exercise

Hello, My question is: in which way this exercise should be solved? It can't be solved with F test, because there were no given F-test value table...

• Replies: 8
• Views: 1,514
02-12-2015, 08:21 AM
17. ### A couple of regression questions

Hi all, I'm pretty new to statistics and am getting a bit confused with all the terminology that's being thrown out there. I've tried googling...

• Replies: 3
• Views: 1,754
02-12-2015, 07:53 AM
18. ### Suggestion for Analysis

I have 2 (control, experimental)groups and i want to compare them on the basis of three types of questions recall , comprehension and...

• Replies: 0
• Views: 998
02-12-2015, 06:26 AM
19. ### Are pH levels considered as discrete or continuous?

Hi everyone, I'm in desperate need of help with my lab report. I no stats genius so any help from all you stats geniuses will be greatly appreciated....

• Replies: 1
• Views: 2,504
02-11-2015, 11:51 AM
20. ### displaying data

Hi everyone I have a really basic question. I am displaying mean and standard deviation as a function of time by means of a line plot with scatter...

• Replies: 1
• Views: 1,052
02-11-2015, 09:08 AM
21. ### Structural equation modeling - predictor measured in different group

Dear all, I am kind of stuk on the following problem: what if you would like to create a model, with several predictors. only one important...

• Replies: 0
• Views: 994
02-11-2015, 08:32 AM
22. ### Nested and crossed

hi, I have the folowing design: Two paper suppliers, slips of paper and measurement points on each slip. For each supplier we take, say, 3 slips...

• Replies: 4
• Views: 1,294
02-10-2015, 02:46 PM
23. ### SPSS, co-occurence measure ?

Hi, I want to see if two conditions always occur together, using SPSS. That is, I have some events that show a certain characteristic, let's call...

• Replies: 0
• Views: 1,353
02-10-2015, 04:57 AM
24. ### Which statistical test do I use?...

Which statistical test should be best used to analyse this data using SPSS? I am currently observing the effects of specific training programs on...

• Replies: 5
• Views: 1,670
02-09-2015, 07:19 PM
25. ### Most Viewed YouTube Videos in the World

where can i get the complete statistics of most viewed you tube videos in the world ?

• Replies: 0
• Views: 882
02-09-2015, 07:14 AM
26. ### Marketing Question

We recently conducted a test. We sent a mailing to one population called "A". The size of the population is 79,000. This population had a response...

• Replies: 4
• Views: 2,017
02-09-2015, 05:12 AM
27. ### interpretation of intercept and regression coefficient

This is a multiple linear regression problem with two independent variables. dependent: blood pressure independent: stress and age The raw...

• Replies: 0
• Views: 988
02-08-2015, 03:02 PM
28. ### Standard Deviation Problem

A student took two test, test A and test B, test A has score=45%, mean=30%, and standard deviation=5%, and test B has score=60%, mean=40%, and...

• Replies: 2
• Views: 1,616
02-08-2015, 12:22 PM
29. ### CI and Sample sizes: How do you calculate probabilities?

So, I have a homework problem: Suppose you drew 250 different random samples and constructed an 80% confidence interval for each one. How many of the...

• Replies: 1
• Views: 1,193
02-07-2015, 06:06 PM
30. ### Statitics Homework

Hello everyone, I have a statistic homework to submit. I have answered all question but too sure about the answer. Can you please check my...

• Replies: 0
• Views: 1,577
02-07-2015, 05:17 PM
31. ### How to solve hypothesis testing problems?

Can anyone help me how to solve it? I watched videos on youtube but still didn't get it.

• Replies: 0
• Views: 1,178
02-07-2015, 03:37 AM
32. ### Statistics - Percentages

a study carried out to investigate the distribution of total braking time (reaction time plus accelerator to brake movement time in ms) during real...

• Replies: 4
• Views: 2,092
02-06-2015, 08:52 PM

A sample of temperatures of initiating a certain chemical reaction yielded a sample average (degrees celcius) of 87.3 and a sample standard deviation...

• Replies: 2
• Views: 2,366
02-06-2015, 06:21 PM
34. ### ASAP-Help :(

Help me please, how will I stand on the results of my quantitative research? I have a sample size of N=46, and the results shows that there is no...

• Replies: 3
• Views: 1,269
02-06-2015, 09:50 AM
35. ### Help needed with Hypothesis Formulation

Dear all, I am currently conducting research on experiential marketing and its influence on customer loyalty and purchase behavior in the general...

• Replies: 1
• Views: 982
02-06-2015, 07:53 AM
36. ### Multiple tests for normality

I know of many tests for normality, but my problem is that I have many variables (13,000) and each variable does not contain many data points...

• Replies: 1
• Views: 969
02-06-2015, 06:45 AM
37. ### Contrasts in ANOVA

When calculating Confidence Intervals for contrasts, if we do not use all of the treatment groups (g) should we evaluate N-g using the subset of the...

• Replies: 7
• Views: 2,077
02-05-2015, 10:22 PM
38. ### how to find statistical significance or variance in the set parameters

if i have three parameters a,b and c . and in each parameter i have three sub parameters 1 2 and 3. so how should i find the groups in which t test...

• Replies: 2
• Views: 1,547
02-04-2015, 11:02 PM
39. ### Data transformation

Hi everyone1 I am working on reproductive biology of insect. Recently, I have done one way ANOVA (with three variables and one factor) and found...

• Replies: 2
• Views: 1,407
02-04-2015, 09:28 PM
40. ### Conducting Research. Need help with Data Analysis

Just a little background on my data: I have been thinking about names and how I cannot imagine anyone I know to have a different name. Their name...

• Replies: 1
• Views: 1,280
02-04-2015, 05:49 PM
41. ### Derive a cumulative distribution curve from a continuous (non-binned) histogram

I am looking for a procedure that will derive a cumulative distribution function from a black body radiation curve described by Planck's law,...

• Replies: 2
• Views: 1,285
02-04-2015, 02:47 PM
42. ### How to detect a differnec on two distributions

Hello everyone, I would like to compare the distribution of night bat activity recorded each hour from 5 pm to 3am (a number of call per hour)...

• Replies: 2
• Views: 1,455
02-03-2015, 08:52 AM
43. ### Help deciding between Generalized Estimating Equations and Hierarchical Regression?

Hi all, So I've got a large data set (actually a bunch of separate sets that I will need to combine) based on repeated measures of young...

• Replies: 1
• Views: 1,421
02-03-2015, 03:21 AM
44. ### Chi-Squared Help

I am working on a homework set and I am very confused on this question...Can someone help me understand? What's wrong with this statement?...

• Replies: 0
• Views: 2,263
02-02-2015, 11:04 PM
45. ### Likert Scale vs Conjoint Analysis. Which to use?

Dear Forum professors, I am planning to conduct a questionnaire to obtain information of a tenant's perspective on management in a building. I...

• Replies: 2
• Views: 1,654
02-02-2015, 09:25 PM
46. ### How to compare two populations with multiple categories of variables

Just looking for a little advice on how best to approach this. Generally: I have 2 populations each with 3 variables. The first variable is...

• Replies: 2
• Views: 1,553
02-02-2015, 04:43 PM
47. ### (SEM) Structural Modeling: identifying problems

Hello, I've received a homework at my UNI to resolve untill my exam (which is friday). It's about SEM. It is in form of a forum post and we need to...

• Replies: 2
• Views: 1,761
02-02-2015, 04:43 PM
48. ### MANOVA vs. ANOVA

Hi, I am trying to determine which of a number of variables differentiate between 3 groups. The groups were created based on cluster analysis,...

• Replies: 0
• Views: 1,247
02-02-2015, 12:21 PM
49. ### trying to determine which test to use for constancy of mean price of milk

"You have been asked to determine if the mean price of milk in your city has remained constant. Suppose that a random sample of n=2 was selected for...

• Replies: 0
• Views: 1,622
02-01-2015, 03:44 PM
50. ### Confidence Interval for binary data

If I want to calculate the 99% confidence interval for binary data. For example lets say I asked 500 people if they had ever done a bungee jump? ...

• Replies: 0
• Views: 2,259
02-01-2015, 02:48 PM
51. ### Sample size calculation for kappa statistic, at 90% power

Hello everyone! I have looked through many previous posts, but cannot find an answer to my question. I am comparing the results from two pieces of...

• Replies: 1
• Views: 4,570
02-01-2015, 10:24 AM
52. ### Adding the mean to a set of scores doesn't change it. Why?

Hello everybody! I am very happy to have found this forum. I am working away with my undergraduate research methods courses. I am not very good at...

• Replies: 8
• Views: 2,625
01-31-2015, 04:58 AM
53. ### Performing a Paired T test

239 subjects had their cholesterol measured, and then were put on high-fiber diets. After a month on the high-fiber diet, the cholesterol was...

• Replies: 0
• Views: 1,243
01-30-2015, 11:39 PM
54. ### Is there a way to convert relative risk to cohen's d or odd's ratios?

So I only have RR but no counts. For a meta-analysis these need to be put on a common metric with other results which all use cohen's d. Hence the...

• Replies: 10
• Views: 3,643
01-30-2015, 05:42 PM
55. ### Equivalence testing - on IQ scores for independent groups

Equivalence testing IQ Hello, I want to conduct a test of equivalence on IQ between two groups. I came across a post where someone (I think it was...

• Replies: 6
• Views: 1,875
01-30-2015, 03:01 PM

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