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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: 197,299
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: 67,050
09-30-2005, 09:44 AM
1. ### Multi response categorical data analysis

Dear list I got a dataset of categorical data were each question can have more than one answer. This is a toy example: question one: what did...

• Replies: 0
• Views: 1,036
04-29-2013, 04:58 AM
2. ### Hypothesis testing.

I am wondering if you can help with a problem.. i have 30 numbers, with the min 13, max 90, mean of 40.43 S is19.68 and stand deviaition of...

• Replies: 4
• Views: 1,368
BGM
04-28-2013, 10:59 PM
3. ### IGARCH model volatility

I know for an IGARCH(1,1) model, the model is : y_{t} = \sigma_{t}\epsilon_{t} \sigma_{t}^{2} = \alpha_{1} + (1-\beta_{1})y_{t-1}^{2}+...

• Replies: 1
• Views: 2,401
04-28-2013, 09:51 PM
4. ### Comparing class grades across several courses – is ANOVA appropriate?

Hi all, A group of ~20 students have taken a number of courses, some compulsory and others electives. I want to see whether there is a difference...

• Replies: 3
• Views: 31,467
04-28-2013, 07:02 PM
5. ### Hi, need help with drawing graph (ANCOVA)

Hello, friends! I would like to draw a line graph (ANCOVA). However, I used SPSS 17.0 and the y-axis did not begin with 0. Anyone with ideas on...

• Replies: 0
• Views: 1,343
04-28-2013, 01:47 PM
6. ### Asymptotic Variance of a Maximum Likelihood Estimator

A population follows the Pareto distribution defined as f(x|x_0,\theta)=\theta x_0^\theta x^{-\theta-1},\quad x\geq x_0,\quad\theta>1. Assume...

• Replies: 2
• Views: 2,342
04-28-2013, 01:32 PM
7. ### Prediction interval question

I have data fit with a loess curve. The predictor is time. I want to know what time has the highest predicted observation and the time's confidence...

• Replies: 4
• Views: 1,372
agp
04-28-2013, 11:29 AM
8. ### Linear regression model / equality of slopes

Hi everyone, I am currently writing my master thesis and I have some questions relating to the regression model. I am trying to prove that...

• Replies: 2
• Views: 2,319
04-28-2013, 11:01 AM
9. ### Sample size in redesigned experiment

This is not a homework question, even though it reads like one. I wrote it this way to make it as simple as possible to explain. An experimenter...

• Replies: 0
• Views: 945
04-28-2013, 10:23 AM
10. ### Calculating with types of data

Why can't one compute with values such as 'M(ale)/F(emale)'? Can't I keep a counter of how many males and females were at an event? Am I not...

• Replies: 0
• Views: 886
04-28-2013, 09:35 AM
11. ### Probability of an event

A woman bears two babies and they both die. The case goes into court and they hire a statistician to figure out what the chance is of a woman...

• Replies: 1
• Views: 941
04-28-2013, 05:20 AM
12. ### Please help!!

Interpret the following: r = .45, p < .05 what if it were -.45? I am trying to finish my homework for a class and I am completely lost as...

• Replies: 1
• Views: 1,275
04-27-2013, 02:16 PM
13. ### my population should be normal distributed for applying t test even with only 30c ?

Hi to everyone! I know that t test should be applied to a normally distributed population...but is it true even when I have a small population?I...

• Replies: 2
• Views: 1,510
04-27-2013, 12:12 PM
14. ### interpretation of log-differences

Hello, - my data set: gdp, interest rate (in %), money aggregate, exchange rate and cpi. - except interest rate all time series are in logs -...

• Replies: 0
• Views: 954
04-27-2013, 12:05 PM
15. ### Cohen D effect size breakdown.

Hi guys, In my study I have found three variables in which demonstrate large group effect sizes (d=.8). I am now in the process of writing up my...

• Replies: 0
• Views: 2,103
04-27-2013, 07:08 AM
16. ### how use SPSS for calculate dunn test??

hi. I need to calculate "dunn test" for my data with SPSS software. can ou help me??

• Replies: 1
• Views: 11,402
04-26-2013, 12:28 PM
17. ### Multi-Variable Attribution Analysis

I have a multi-variable equation in which I am trying to run an attribution analysis for the change from one period to another. For example: ...

• Replies: 0
• Views: 2,178
04-26-2013, 12:22 PM
18. ### Linear mixed model - which covariance structure to use?

I need to run a linear mixed model analysis on my data and am very confused as to which covariance structure to use. I have collected brood...

• Replies: 1
• Views: 4,008
04-26-2013, 03:15 AM
19. ### T-test or 2X2 ANOVA

I have data that lends itself to a 2X2 Analysis, however I want to split this into separate T-tests because I am interested in looking at differences...

• Replies: 2
• Views: 3,067
04-25-2013, 06:35 PM
20. ### Binomial Probability Distribution

In an experiment on ESP, a subject is asked to state the color (red or blue) of a card chosen from a deck of 25 cards. It is unknown how many red or...

• Replies: 0
• Views: 1,179
04-25-2013, 04:00 PM
21. ### Choice of stats test: two-way repeated ANOVA or area under the curve?

Hi guys, I am fairly new to both of these statistical techniques and would appreciate your thoughts on which test would be most appropriate for the...

• Replies: 2
• Views: 3,627
04-25-2013, 09:58 AM
22. ### 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: 4,229
04-25-2013, 09:29 AM
23. ### Kernel Density Funtion in SAS

Hello, I run a distribution analysis in SAS and i fet the histogram of the variable of interest (drawn from a sample). I ask for a normal curve to...

• Replies: 3
• Views: 1,870
04-25-2013, 02:32 AM
24. ### Finding Bayes action

A woman must dcide between waxing her car (action a1) and not waxing her car (a2). She's concerned of the weather on whether it will be sunny (o1)...

• Replies: 1
• Views: 1,353
04-24-2013, 08:50 PM
25. ### does anybody know how to learning statistics online free?

hi everybody, i was wondering if anybody here might know a good site to learn statistics online without paying. if anyone does know a good site a...

• Replies: 4
• Views: 13,312
04-24-2013, 08:00 PM
26. ### Categorical Variables Vs Continuous

Hello, Let us say that we have a variable expressing the score of a student in a test that can range between 0 and 1600. The score can only take...

• Replies: 3
• Views: 3,654
04-24-2013, 05:58 PM
27. ### Use of descriptive statistics,Calculation of measures of average and dispersion

hello guys i need help. i have a work for my college but i have never done statistic. please,help me. Machine 1(weights in grams)...

• Replies: 2
• Views: 1,801
04-24-2013, 05:15 PM
28. ### Logistic Regression / Weight of Evidence Transformed Variables

Hi Everyone, I'm looking for some help to interpret the output of logistic regression when using predictors that have been transformed and binned...

• Replies: 1
• Views: 7,190
04-24-2013, 05:05 PM
29. ### Help with Two way anova

Hi, I'm running a two way anova on my data. I have two factors Oxygen tension (2% and 20%) and drug dose (0um 10um and 20um). After I run the two...

• Replies: 3
• Views: 1,405
04-24-2013, 04:13 PM
30. ### Maximum Likelihood Function

Hey everyone, Reviewing for a final and am going through problems in the text. One question asks me to find the maximum likelihood estimate of...

• Replies: 1
• Views: 1,029
BGM
04-24-2013, 03:53 PM
31. ### Traffic Intersection Probability Question

We are doing a project and for each lane we need to find the probability of a vehicle arriving in the system arriving at an intersection after each...

• Replies: 4
• Views: 1,755
04-24-2013, 03:35 PM
32. ### mixed effect: what should be modelled as random effect?

I'm trying to figure out what should be modelled as the random effect in a mixed effects model. I've made this toy data which shows exam scores of...

• Replies: 8
• Views: 1,669
04-24-2013, 03:30 PM
33. ### Develop a proof for these error estimate functions

From what I've gathered these functions are all over statistics books, but in terms of how they came to these conclusions I'm at a loss. e_y =...

• Replies: 2
• Views: 1,141
04-24-2013, 02:40 PM
34. ### Comparing Samples - How to statistically analyse

I am investigating an intervention and would like to know how to compare samples before and after the intervention. Usually I would just use a paired...

• Replies: 2
• Views: 1,264
04-24-2013, 01:21 PM
35. ### Should i use Chi square or other tests?

Supposed I have a data like this: ---------------Healthy----Sick---- Smoker----------100------90----- Nonsmoker-------250-----260----- (100...

• Replies: 5
• Views: 1,501
04-24-2013, 02:33 AM
36. ### Sales Dispersion analysis

I am having branchwise monthwise sales data for 12 months & the target for next 12 months. Now how to do dispersion analysis of this.

• Replies: 1
• Views: 920
04-24-2013, 12:08 AM
37. ### SOS for my dissertation!!!!!!!!

hello guys. i have a huge problem. im a postgraduate student and I am doing my dissertation because in 10 days i have to submit it. generally, i am...

• Replies: 1
• Views: 1,127
04-23-2013, 08:50 PM
38. ### Statistics Help Much Appreciated

Hi, I'm revising for my upcoming exam and I have pastpapers but they don't give us the answers and I am unsure whether I have two questions right and...

• Replies: 6
• Views: 1,289
04-23-2013, 07:03 PM
39. ### Calculating prediction equation from odds ratio

I have a homework problem involving income levels and presidential prediction. I am given my log odds (R=republican, I=independent, D=democrat;...

• Replies: 2
• Views: 1,581
04-23-2013, 07:49 AM
40. ### Differences in how Observed Test Statistic (OTS) is calculated?

So Im studying for a final exam and Ive noticed that my teacher has calculated the observed test statistic differently in a couple examples, giving...

• Replies: 0
• Views: 1,498
04-22-2013, 09:42 PM
41. ### Standard deviation of the mean difference out of Pre/Post Test Descriptive Statistics

I have several RCT pre/post intervention studies that I am calculating Hedge's g for. All of the studies report the difference of mean and difference...

• Replies: 0
• Views: 4,359
04-22-2013, 09:15 PM
42. ### Error when trying to make between level comparison of a variable

Hi, I am presently conducting a meta-analysis in STATA and trying to compare all categories within a single column variable. The variable has...

• Replies: 0
• Views: 1,305
04-22-2013, 07:41 AM
43. ### Conjoint analysis for testing causal-effect relationships?

I am using traditional conjoint analysis to examine the relative importance of three product attributes on likelihood of purchase (rating scale 1 to...

• Replies: 0
• Views: 1,153
04-22-2013, 07:39 AM
44. ### Help With Hypothesis Testing In Log-Lin Model

I am posting this here in the hopes that it will be seen quicker and I can get help quickly (which is needed considering my presentation is tomorrow...

• Replies: 0
• Views: 1,082
04-22-2013, 12:56 AM
45. ### Setting proper targets - which method to use

Please delete this threat. Thank you

• Replies: 0
• Views: 1,070
04-21-2013, 05:56 PM
46. ### Can I compare observed and expected values simply with R-Sq.?

I want to make comparisons between two sets of values and find how well my observed fit expected values. Observed 0.24 0.24 0.21 0.14 0.13...

• Replies: 2
• Views: 2,043
04-21-2013, 03:47 PM
47. ### Comparing prices in different countries

Hi Everybody!!! I am currently writing a master's thesis in political science, about how food prices affects the outcome of conflicts. I have some...

• Replies: 7
• Views: 2,648
04-21-2013, 10:44 AM
48. ### Computing spectral density of process

Suppose you have a stochastic process Y_{t} = \frac{1}{2}(X_{t-1} + X_{t} + X_{t+1}). X_{t} = 0.5*X_{t-1} +w_{t}. How would you compute the...

• Replies: 0
• Views: 1,227
04-20-2013, 05:10 PM
49. ### Interaction term between ID variable and a continuous variable

Some background information: I have a panel dataset covering a five year period using 32 different entities. Additionally I may add that the...

• Replies: 0
• Views: 1,567
04-20-2013, 07:22 AM

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