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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: 197,019
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: 66,887
09-30-2005, 09:44 AM
1. ### Entering & analysing aggregate categorical data in SPSS?

Hi all, Just wondering if anybody knows how to enter and analyse aggregate categorical data into SPSS? I have been provided with prisoner data...

• Replies: 1
• Views: 4,207
10-19-2011, 02:42 AM
2. ### Z score

I am having difficulty understanding the Z score. Its looks like that SD and Z score is doing the same function? Could you please explain with small...

• Replies: 2
• Views: 4,206
01-25-2006, 05:41 PM
3. ### small sample size n=18

I have two samples and I was wondering if there is a way to standardize the calculations in my smaller sample so that the calculations in both...

• Replies: 6
• Views: 4,206
04-30-2011, 07:21 PM
4. ### ANCOVA post hocs?

How do I do post hocs for ANCOVAs?

• Replies: 2
• Views: 4,205
04-18-2009, 01:23 PM
5. ### Repeated Measures - unequal time points across groups

Hi everyone, I need to compare two groups. Group 1 will take drug X for 12 months and Group 2 will take drug X for 8 months. They will be given...

• Replies: 2
• Views: 4,203
01-22-2009, 08:44 PM
6. ### gamma-function

gamma-function g(t) = ymax * t^(alpha) * exp( alpha * (1-t)) With known ymax and alpha, what is the maximum slope of g(t) (with t>0)?

• Replies: 23
• Views: 4,203
05-28-2013, 02:20 PM
7. ### AS Statistics - Time Series Analysis (S2)

Hello all My teacher was teaching us Time Series Analysis qiute a while ago and when he was explaining it i didn't understand properly and didn't...

• Replies: 0
• Views: 4,202
05-09-2007, 10:24 AM
8. ### help

Honestly I have no idea how to do these I dont even know where to start please help In the past, of all the students enrolled in “Basic Business...

• Replies: 1
• Views: 4,201
10-20-2005, 03:37 PM
9. ### Cholesterol Scales of Measurement?

Hello guys hope you can help me with this simple question: would you be so kind to tell me what is the Scale of Measurement of Cholesterol ? ...

• Replies: 3
• Views: 4,200
03-27-2012, 07:24 AM
10. ### Hypothesis testing

Here I am again....Thank you so much for helping me out yesterday. I am lost when it comes to Hypothesis testing....What do you think about this...

• Replies: 4
• Views: 4,199
12-14-2005, 02:52 PM
11. ### Case vs Group of Controls

Hi. I am a medical resident doing a required research project. Perhaps someone can help me by pointing me towards the correct statistical test. I...

• Replies: 9
• Views: 4,199
05-28-2008, 08:43 PM
12. ### Four-Way ANOVA

Hello, I want to analyse the effects of four categorical independent variables on one dependnet variable. For each independent variable, I have two...

• Replies: 0
• Views: 4,199
08-23-2010, 01:47 PM
13. ### preferred equation display

I'm looking for people's opinions on the best way to present the same equation.Below are a series of differently formatted equations. Which equation...

• Replies: 16
• Views: 4,199
08-18-2012, 08:53 AM
14. ### Random variables problem

Hello all. I'm having a lot of trouble with several of the problems on my latest stat homework. Up until now I've understood almost everything, but...

• Replies: 7
• Views: 4,196
BGM
12-07-2010, 10:27 AM
15. ### Fisher Vs Neyman "Test of significance" Long term error rates.

I have just recently achieved a small insight into the differences between Fisher's and Neyman's theories in significance testing; however, I am...

• Replies: 1
• Views: 4,196
02-27-2011, 10:11 PM
16. ### Multiple Correlations and managing Type 1 error

Hi all I am currently resubmitting a paper in the behaviour psych area and we have had mixed reviews re how to manage type 1 error due to our...

• Replies: 3
• Views: 4,194
03-03-2008, 04:23 PM
17. ### Converting scores to a metric

Scores for the AAT are reported with a mean of 80 and a standard deviation of 8. Martina received a raw score of 84 on the math portion of the AAT. ...

• Replies: 8
• Views: 4,193
06-18-2007, 12:48 PM
18. ### Var(x + c)

This is an elementary question, however, I am a little stuck :( If x is a random variable and c is a constant, how would you expand that? For...

• Replies: 1
• Views: 4,193
05-19-2009, 05:27 PM
19. ### calculating statistical difference

Hey everyone, I am trying to figure out how to calculate if a survey statistic is different from a benchmark or goal. The statistic is a little...

• Replies: 2
• Views: 4,192
02-27-2008, 09:25 AM
20. ### Significant difference between two proportions?

Is it possible to test for a significant difference between groups if all the information you have is the number of people in each group and the...

• Replies: 3
• Views: 4,189
08-29-2011, 11:35 AM
21. ### Apples and Pears

Hi all, I have a challenge for you, this might be quite easy or quite difficult... as I neither know the answer nor have any idea of the solution....

• Replies: 2
• Views: 4,188
07-07-2008, 01:04 PM
22. ### Question regarding interaction terms in a nested ANOVA

Hi All I am a master’s student and I have a statistical question. I have an experiment evaluating the effects of intertidal elevation (fixed; 3...

• Replies: 0
• Views: 4,187
04-28-2009, 01:08 PM
23. ### Percentages

Hello, I am quite new in statistics so sorry if my question is not clear enough. After creating a structure in excel i ended up with a column...

• Replies: 3
• Views: 4,187
12-12-2010, 10:08 AM
24. ### Data analysis - which test is best

I would like to know which test would be appropriate for testing my hypothesis. I am doing a research project on parasitic infections in snail...

• Replies: 25
• Views: 4,187
04-25-2013, 09:29 AM
25. ### Hosmer-Lemeshow Test Table Interpretation

Hi! I need someone to interpret this. Sorry, I got no knowledge at all. I tried searching the forum but the analysis chapter of my thesis keeps on...

• Replies: 6
• Views: 4,186
05-01-2014, 10:19 PM
26. ### how to check for equal distribution

Hello, I have been struggling with this problem and would appreciate any guidance or help anyone has to offer! A chef at a 5-star restaurant...

• Replies: 1
• Views: 4,184
05-21-2010, 09:54 PM
27. ### Need help with Seasonal index

Hi I just need some advice with making a seasonal index. I have twenty years of monthly data, I've made a pivot table to combine each month's...

• Replies: 1
• Views: 4,184
03-28-2011, 06:36 AM
28. ### Presenting the results: Continuous variables, Normally distributed vs non normally

Hi :) My question is most probably simple but I can't find an answer to it. According to my stats textbook one should report continuous...

• Replies: 2
• Views: 4,184
09-25-2013, 10:19 AM
29. ### Correlation and Regression on Excel?

HOW?! a. Draw scatter plot for the variables b. Compute the value of the correlation coefficient. c. State the hyptothesis. 12. A medical...

• Replies: 6
• Views: 4,183
ssd
12-13-2006, 02:48 AM
30. ### Need guidance

Guidance and not the answer is what I would be most grateful for...I am trying to learn and keep seeing obstacles I cannot get around. The data I...

• Replies: 2
• Views: 4,183
08-05-2010, 08:14 PM
31. ### Studentised range value

Hi, I am part of the way through conducting a Tukey hsd test and now require my studentised range critical value (qt). My problem: My df's and...

• Replies: 4
• Views: 4,182
11-19-2008, 04:05 PM
32. ### Help me please ... How to calculate the next element

Hello, My boss has just asked me to come up with a formula which allows me to calculate the dow jones odds. I have all the dow jones values since...

• Replies: 7
• Views: 4,182
08-11-2009, 08:29 AM
33. ### Deconvolution of gamma distribution

Notation: g(x,a,b) is the gamma distribution with shape a and scale b. The distribution g(x,1,1) is the standard exponential distribution. I have...

• Replies: 2
• Views: 4,182
11-14-2009, 05:35 PM
34. ### Likert: Fisher's exact OR Kruskal-Wallis?

Hi, I've got a survey with 50 responses, and want to test for difference between three subgroups, and strength of association. I'm not happy to...

• Replies: 0
• Views: 4,182
04-26-2012, 09:38 AM
35. ### How do I find standard deviation without a sample size ?

I have been working on a problem with the help of a friend who is pretty knowledgeable on the subject. I don't think this is possible to find a...

• Replies: 2
• Views: 4,182
02-21-2015, 10:44 AM
36. ### analysis for testing improvement size across 2 groups

I would love input regarding what analysis to use Design: IV: 1 between subjects group (sought assistance, no assistance sought) DV: ...

• Replies: 12
• Views: 4,181
06-17-2009, 10:29 AM
37. ### Structural equation modeling--LISREL

Are they any good books on how to interpret LISREL outputs?

• Replies: 1
• Views: 4,179
02-04-2012, 02:24 PM
38. ### Stats Help

Hi All, 1st time post here. I have a project where I am to do some data analysis for a 5 year trend of all submitted applications. I am using...

• Replies: 2
• Views: 4,179
09-05-2007, 08:40 PM
39. ### Variable type SOS

i know it may sound stupid to some of you but i have a question i really need an answer to : In the SPSS i defined an IV as yes/no and marked...

• Replies: 2
• Views: 4,179
10-15-2008, 11:57 PM
40. ### level of signifigance

sample question, in 2000, 58% of females aged 15 years of age and older lived alone, according to the US Census Bureau. A sociologist wants to know...

• Replies: 1
• Views: 4,179
11-21-2010, 04:23 PM
41. ### How do you find the expected value, given 2 exponential random variables?

This was my problem: X, Y are independent lambda-exponential random variables. Z = min(2X, Y). Calculate V(Z) and E(Z^2). Since Z = min(2X,...

• Replies: 1
• Views: 4,179
04-19-2011, 11:05 AM
42. ### Maximum likelihood estimator - geometric distribution

Need help getting the MLE. Problem defines the geometric distribution as pi(1-pi)^y

• Replies: 7
• Views: 4,179
08-28-2012, 10:32 PM
43. ### Feline Epilepsy: Please provide Guidance

I have a 3 year old male cat (Isidore) with primary epilepsy of 1 year duration. I have recorded the dates and durations of his ictal phases: 7...

• Replies: 1
• Views: 4,177
11-24-2008, 10:47 AM
44. ### Estimate of travelling time

Hello! I'm a Norwegian engineer, now located in Tunisia. Everyday i take a sort of taxi, called collective taxi to my Arabic lessons in the neighbor...

• Replies: 12
• Views: 4,176
09-30-2010, 12:55 AM
45. ### pilot study sample size

Im doing a survey and I want to conduct my pilot study, im not so sure of how to calculate the sample size will you please help me ...

• Replies: 4
• Views: 4,176
BGM
10-09-2011, 12:06 PM
46. ### Hypothesis testing in poisson distribution

At a nuclear plant great care is taken to measure the employees health.These are the number of visits made by each of the 10 employees to the doctor...

• Replies: 5
• Views: 4,176
10-28-2013, 10:25 PM
47. ### basic help needed for Chi-square

Hello all, I feel embarassed even having to ask this, but I'm not much of a numbers person, and I've worked myself into a corner. I would...

• Replies: 4
• Views: 4,175
01-30-2011, 02:08 PM
48. ### Significance of the difference between two correlation coefficients

Hi, based on the sample size I want to calculate whether to correlation coefficients are significantly different or not. I know that as a first...

• Replies: 0
• Views: 4,174
11-29-2010, 10:30 AM
49. ### I Can't believe no one knows?

Hello, I have a set of data for 52 weeks that includes the revenue per customer, the till difference (money missing from the cash register or...

• Replies: 6
• Views: 4,173
11-12-2010, 09:23 AM
50. ### Some Statistics Homework help :(

Hi guys I was doing my homework and got stuck on these questions: http://img219.imageshack.us/img219/306/20633307.png and...

• Replies: 4
• Views: 4,172
03-21-2011, 12:00 PM
51. ### intraclass correlation: ANOVA vs. Linear Mixed Models

Hello, I'm having an issue in calculating and interpreting intraclass correlation. For example: We have a repeated measures design for 20...

• Replies: 0
• Views: 4,172
06-09-2014, 05:58 PM
52. ### probability density function=P(X E (x,x+dx) )?

"Let X be a continuous random variable. probability density function=f(x)=F'(x)=P(X E (x,x+dx) )" Now I don't understand why f(x) would be...

• Replies: 1
• Views: 4,170
01-17-2009, 12:24 PM
53. ### Comparing Two Percentages- which test

Hello All, I'd be really grateful if anyone might be able to help me- trawling the internet and reading through my old A-level stats notes has...

• Replies: 2
• Views: 4,169
02-19-2012, 02:35 PM
54. ### Which book would you buy ?

I found 2 books at Amazon.com. Both are about linear regression. Both have good overall ratings. Book A has the following ratings: 5 5 5 4 4 3 3...

• Replies: 18
• Views: 4,169
02-18-2016, 08:38 PM

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