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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: 200,091
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: 68,408
09-30-2005, 09:44 AM
1. ### $60 - tutor wanted$60 an hour. R code Logistic and Poisson Regression Central Limit Theorem ANOVA Single, two pop tests Simple and Multiple Linear Regression...

• Replies: 36
• Views: 8,772
12-03-2011, 01:44 PM
2. ### < or > minus numbers

If I wished to say everyone who scored between -100 and -10 was virtually blind, which one of these statements is correct; 1. Everyone who scored...

• Replies: 0
• Views: 1,037
05-07-2017, 12:55 PM
3. ### "A Gnarly Skewed Data Set..."

For an assignment, I am to find and analyze an extremely skewed data set. However, I'm having trouble simply finding one. If someone could direct...

• Replies: 0
• Views: 2,275
02-27-2011, 10:56 PM
4. ### "at least probabilities"

Okay, I've been struggling with this problem for over two hours and I'm continuing to get more confused. Any advice would be great. Here's the...

• Replies: 1
• Views: 3,050
03-22-2013, 10:39 AM
5. ### "averaging" standard deviations

Hello, I've been given the mean and standard deviation of many sets of the same measurement (bead size). So, I basically have a list of means and...

• Replies: 2
• Views: 4,471
02-08-2011, 04:07 PM
6. ### "chi-square test statistic"

Hello everyone, Maybe someone can help me with this. I'm having trouble understanding (intuitively) how/why the "chi-square test statistic" is...

• Replies: 3
• Views: 2,789
12-01-2009, 02:16 AM
7. ### "Combined" Means and Variances?

Hi everyone. This is my first stat assignment of the semester and I am already confused. I'm not sure what my prof is asking. I will reproduce...

• Replies: 8
• Views: 7,595
09-13-2010, 08:07 PM
8. ### "Conditional chis square test of independence"

I am studying for comps (my life is complete):shakehead and I ran into a test that I had not heard of it. Or a variation of one anyhow. It has a...

• Replies: 2
• Views: 1,983
08-12-2012, 04:35 PM
9. ### "Easy" regression/hypothesis test questions

Dear community, I'm having trouble with some basic regression questions. 1) Test the null H0: Intercept = 0. If -95% confidence interval =...

• Replies: 3
• Views: 5,428
10-25-2010, 11:22 PM
10. ### "Frequency distribution of numerous variances"

I am working on a homework assignment from a very vague, poor teacher. I flipped 20 coins, measured the amount of heads and so forth, and repeated...

• Replies: 1
• Views: 2,114
10-11-2010, 05:59 PM
11. ### "Higher" log-lin model produces worse fit?

Hi! I would really appreciate some pointers on this: a log-linear model that produces better fit with fewer terms. E.g. in a 3D scenario I...

• Replies: 0
• Views: 2,203
12-02-2010, 06:05 PM
12. ### "independent of" vs "mutually exclusive"

Hi, I am a stats newbie. Sorry about asking this trivial question. Say I have a 2 x2 contingency table. The categories defining rows and...

• Replies: 4
• Views: 7,719
07-27-2011, 04:03 PM
13. ### "Inference" under Complete Census

Is there such a thing as inference under a complete census, or is this a logical nonsequitur? Follow-up question... Say I wish to model a...

• Replies: 1
• Views: 2,301
06-18-2008, 12:48 PM
14. ### "is men more responsible than women" how to construct hypothesis.

"Are men more responsible than women"* two qualitative variables: men/women responsibility: yes/no i would like to test if men are more...

• Replies: 0
• Views: 1,751
05-17-2012, 06:06 AM
15. ### "Linear at the Parameters"

I'm having a hard time with this concept. I've read as many different sources on this terminology as I can find, but it seems that most of them...

• Replies: 5
• Views: 2,448
10-18-2014, 09:09 AM
16. ### "make an analysis of your own choice"

working on an assignment about jobsatisfaction, got the variables: motivation, sex, department number, responsibility, job function, days of illness,...

• Replies: 6
• Views: 4,103
05-16-2012, 05:04 PM
17. ### "Mann-Whitney U-test" application on 2 samples which are given the same treatment

suppose, in a diploma school of business Management there are 400 students, a sample 27 students with say 17 boys and 10 girls, are obtained using...

• Replies: 2
• Views: 1,497
08-22-2012, 06:52 AM
18. ### "Natural Log Transformation" of some items in SPSS?

Hello everyone, I did Sperman's Correlations on a couple of items (let's call them 1, 2, 3, 4, 5), but it gave me the correlations for item 2,...

• Replies: 0
• Views: 3,146
10-28-2011, 08:04 AM
19. ### "Normal" distribution or not?

Hello guys, congratulations for the forum, it's really great. I am an italian student of medicine and I'm starting to learn statistics matter couz I...

• Replies: 5
• Views: 2,782
03-10-2011, 04:29 PM
20. ### "Propagating" Degrees of Freedom

Good evening! -Background I'm a chemistry student who's received some elementary training in statistics. At the moment, I need to take...

• Replies: 2
• Views: 3,679
04-29-2013, 11:20 PM
21. ### "significance metrics" for hypothesis testing

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• Replies: 0
• Views: 2,184
p05
08-02-2010, 07:57 PM
22. ### "Sticky" Cash Flows?

Hey guys, I'm running a regression with cash flows in/out of a fund as my dependent variable and the S&P 500 and the VIX index as my independent...

• Replies: 0
• Views: 2,736
08-19-2011, 04:03 PM
23. ### "UNIANOVA" Command renders...? What do I call this table?

UNIANOVA Depression BY Sex /METHOD=SSTYPE(3) /INTERCEPT=INCLUDE /EMMEANS=TABLES(OVERALL) /EMMEANS=TABLES(Sex) /PRINT=HOMOGENEITY ...

• Replies: 0
• Views: 1,779
11-22-2011, 02:28 PM
24. ### "Use the normal approximation to the binomial distribution" help if possible?

Hello, i'm new here and i'm stuck on a question. This isn't really from my homework, as i'm just reviewing for my final which is in a week. The...

• Replies: 1
• Views: 6,223
01-07-2007, 01:10 AM
25. ### "Variance" by STDEV and Different Means

Im trying to measure 'consistency' in baseball scores amongst two different sample groups. For example, in a sample of 162 games each, one team...

• Replies: 5
• Views: 2,571
07-03-2012, 04:32 AM
26. ### "You never see a Ferrari rust like a Honda"

When someone says "You never see a Ferrari rust like a Honda", the logical flaw is that a Honda is typically used as daily drivers thru severe...

• Replies: 8
• Views: 2,901
12-31-2015, 03:00 PM
27. ### 'Alternate' proof that the expected value of the sample mean is the population mean

It would be appreciated if someone could verify that this makes sense. By definition \bar{x} = \frac{\sum x_i}{n} So taking its expectation we...

• Replies: 3
• Views: 3,351
BGM
04-06-2014, 03:35 PM
28. ### (> one hour invested)

I have spent more time than I should this one. Given that P(A or B) = 1/4, P(A) = 1/7, and P(A and B) = 1/9, find P(B). I've worked it many...

• Replies: 1
• Views: 1,447
BGM
10-09-2012, 04:16 AM
29. ### (Anova)Comparing 4 Data

I have data of soil hardness from 4 different treatments I want to know if they are significantly different to each other or not. In Anova I can...

• Replies: 1
• Views: 1,034
06-23-2015, 12:00 AM
30. ### (Binominal proportions) confidence interval – which formula to use?

Hey, I got a quick question regarding confidence intervals. For a Rasch analysis I have to perform independent t-tests (it’s done to check for...

• Replies: 2
• Views: 27,162
11-12-2012, 06:30 AM
31. ### (bio)equivalence tests: acceptable difference

As you may know, (bio)equivalence tests are tests that are able to show equivalence between two compared groups, other than the more common tests...

• Replies: 0
• Views: 3,677
04-26-2007, 07:40 AM
32. ### (categorical data - small sample) Appropriate test(s)?

Greetings! I have a small sample (11 responses) of categorical data. I want to compare a binary response (near vs. far) to a nominal response...

• Replies: 0
• Views: 1,931
JLC
04-29-2013, 10:29 PM
33. ### (mis)-use of Post-Hoc tests. Theory question....

Hi all, newbie here with a question I was hoping someone with more statistical theory knowledge could answer. :) I have a question for you re: the...

• Replies: 0
• Views: 1,917
05-05-2009, 01:40 PM
34. ### (Multiple regression) Calculating extra sum of squares without calculating H matrix?

This is a problem given as practice for my exam Y: 3 4 6 8 5 5 9 8 7 5 X1: 1 -1 -1 1 0 0 0 0 0 0 X2: 0 0 0 1 -1 -1 1 0 0 0 X3: 0 0 0 0 0 0 0 1...

• Replies: 0
• Views: 2,475
11-20-2011, 01:59 AM
35. ### (nested) mixed model in SPSS

Hi My question concerns both data structure (and subsequent the exact analysis model to use) and the implementation in the statistical software...

• Replies: 0
• Views: 3,601
m.v
04-17-2013, 08:45 AM

I have a set of Likert-type variables that I'm trying to sum up to form a scale. My dataset has around 5000 subjects, and there are about <10%...

• Replies: 0
• Views: 1,348
07-22-2014, 09:43 PM
37. ### (R) Analysing abundance in plots with different treatments -with factorial ANOVA?

I'm not connected to a Uni anymore, but want to write an article on my friend's data from her Master's while applying for a Phd. The data will...

• Replies: 0
• Views: 1,069
06-17-2016, 03:22 AM
38. ### (Random Forests - R) Understanding randomForest’s classification error

I am having trouble getting my head around the concept of classification error on the model confusion matrix. I understand that an 0.07 class.error...

• Replies: 0
• Views: 1,966
06-02-2014, 05:28 AM
39. ### (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: 1,864
02-02-2015, 04:43 PM
40. ### (SPSS logistic regression) Variable effect in wrong direction

I am running a logistic regression with 7 IVs, N= 214. The model is significant and the R2 is .45. However, the individual variables show some odd...

• Replies: 2
• Views: 2,274
12-17-2012, 12:19 PM
41. ### (too) small sample size?

Without going into too much detail: I have a number of people every year. At one point, something happens that makes the yearly number of people...

• Replies: 1
• Views: 1,399
09-13-2016, 02:22 AM
42. ### (Urgent) Missing Data- Missed completely one item through out the study

Hello Everyone, I ve been encounter one serious issue of missing data for my research. That is, i forgot to include one item in my research....

• Replies: 1
• Views: 1,707
04-11-2012, 10:22 AM
43. ### (weighted) mean of standard deviations

Dear all, I have the following problem. Suppose I have three results of temperature measurements: 10 +/- 2 2 +/- 6 9 +/- 3 Here the +/-...

• Replies: 2
• Views: 4,337
11-22-2011, 03:13 PM
44. ### ***Fun Challenge -- weighted average of global rankings***

Goal The goal is to create a weighted average of global rankings. Does not have to be perfectly accurate (if that was even possible). Specific...

• Replies: 2
• Views: 3,041
08-03-2011, 11:36 AM
45. ### *HELP PLEASE! I'm going CRAZY trying to figure this out.

The UN is going to build a small clinic in a remote village in Africa to deal with the recent outbreak of a disease. The probability of having the...

• Replies: 3
• Views: 2,391
02-23-2009, 01:16 AM
46. ### *Novice* Which test? Is one even possilble

Hi Everyone, I am a complete novice to the world of statistics and I'm not the best mathematician. I have the data of three different city...

• Replies: 2
• Views: 1,903
04-04-2014, 12:38 PM
47. ### -->(BOX-COX) Transformation breaks down for large (positive) coefficient values <--

Hi, I have done a box-cox transformation of my response variable, using the following formula: (Y^lambda - 1)/lambda Previously, I have got some...

• Replies: 0
• Views: 1,488
06-07-2013, 04:05 AM
48. ### -.00 or .00

Hi, I'm including a correlation table in a write-up and I'm sticking with two significant digits. One of my correlation coefficients is -.003. ...

• Replies: 3
• Views: 2,914
08-19-2008, 11:45 AM
49. ### ....another beginner

Hello everyone, :wave: I'm a beginner with stats but also a beginner with forums, so not even sure if I have posted this in the correct place - it...

• Replies: 3
• Views: 1,973
11-26-2011, 08:14 AM
50. ### ..what should be a simple stats question

that is kicking my proverbial rear for a CJ stats class.. assume a mean score of 20 offenses a month and a population standard dev of 4 offenses,...

• Replies: 1
• Views: 3,029
02-22-2010, 01:35 PM
51. ### .05 level of significance?!!!

can someone please help me out? i just need the formula. i have no idea how to even start this problem! =( once i can figure out values for X then i...

• Replies: 0
• Views: 7,452
07-06-2006, 02:12 PM
52. ### 0.00000 significance value

Hi everyone, New to Talk Stats, so be nice! I have looked for an answer to my problem on previous posts but have not been able to find anything...

• Replies: 4
• Views: 1,763
04-11-2015, 07:56 AM
53. ### 0.025 quantile from standard normal dist. is

1.96. Can anyone tell me how we get this number? This is related to Wald test. I don't know how I can calculate 0.025 upper quantile from...

• Replies: 1
• Views: 5,968
BGM
02-23-2010, 02:21 AM
54. ### 0.05 Level of Significance... HW HELP!

Here is the problem: (A) Select a random sample of 30 student from our population (we have a data entry to get the sample from). At the 0.05 level...

• Replies: 0
• Views: 5,770
12-16-2007, 03:52 PM
55. ### 0.05 or 0.01 level of p for multiple comparisons?

I wrote a scientific paper measuring ovarian volumes after two different surgical procedures performed on either ovary. The measurements were at...

• Replies: 3
• Views: 2,089
07-06-2015, 03:45 PM
56. ### 1 factor (2 levels), and 3 between-subjects factors

Hi all, I am doing a psycholinguistics project (and bad at statistics) and would appreciate advice on what stats to run. There is one...

• Replies: 2
• Views: 1,853
09-30-2014, 05:46 AM
57. ### 1 level of nominal IV correlate to Interval DV - how to do this?

I have 1 categorical Iv which has 4levels - and 1 dv which is interval scores The 4 levels of the Iv are 4likert scale responses - from "not at...

• Replies: 0
• Views: 1,062
06-03-2014, 09:26 PM
58. ### 1 sample K-S-Test output

Hi there, I got told that I would need to do a test to look at my data and whether it is normally distributed or not. So I did the 1 sample K-S-...

• Replies: 3
• Views: 6,633
01-12-2010, 06:08 AM
59. ### 1 tailed test or two tailed?

A researcher would like to know if oxygen deprivation at the time of birth has a negative effect on IQ. My Answer: 1-tailed, right? I just...

• Replies: 1
• Views: 4,980
06-06-2008, 01:41 PM

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