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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: 196,846
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: 66,806
09-30-2005, 09:44 AM
1. ### Standard Deviation - Moving Range

I would like to create an individuals control chart. I need to calculate the standard deviation using moving range. I was given the answer of 3.39. I...

• Replies: 15
• Views: 4,909
07-15-2015, 03:04 PM
2. ### Best method for situation

I receive monthly data where for one item, the value (count for a month may include duplicates from other months (it's a patient count and a patient...

• Replies: 1
• Views: 1,108
07-15-2015, 02:11 PM
3. ### Paired data but unequal sample size

Hi there, I'm not great with statistics so apologies if this is a really silly question. I'm conducting research on women who suffer third degree...

• Replies: 0
• Views: 772
07-15-2015, 09:01 AM
4. ### Degrees of Freedom

Hello, I want to explain the meaning of degrees of freedom to people that are not mathematicians. What should i tell them? More specifically i...

• Replies: 9
• Views: 11,815
07-15-2015, 09:00 AM
5. ### Trouble interpreting certain notations

I'm reading "Statistics: Principles and Methods" by Johnson and Bhattacharyya (7th edition). I know x-bar is sample mean, mu is population mean, s^2...

• Replies: 3
• Views: 1,162
07-15-2015, 08:27 AM
6. ### Predicting the area of each crop in the next season in a farm based on historic data

I have a farm with 10 years data about the area and type of crops which planted. The whole area of the farm is 220 hec and 4 different types of crops...

• Replies: 0
• Views: 1,013
07-15-2015, 07:55 AM
7. ### Sampling confidence as the months pass

Hi guys. I am wondering how I would report on sampling in certain months based on a sample that has taken place months before. For example in...

• Replies: 0
• Views: 1,242
07-15-2015, 07:23 AM
8. ### How to compute the residual standard deviation from `glmer()` function in R?

I want to extract standard deviation of residual from `glmer()` function in R . So I wrote : lmer_obj = glmer(Y ~ X1 + X2 + (1|Subj),...

• Replies: 0
• Views: 1,820
07-15-2015, 07:10 AM
9. ### Finding total standard error

I have 3 samples each with a different numbers of samples and a different standard error for each. Im attempting to find the total sampling error. I...

• Replies: 1
• Views: 667
07-14-2015, 12:54 PM
10. ### Multiple test correction for Chi-Square in SPSS

I have 1 binary dependent variable (presence or absence of coeliac disease) and multiple binary independent variables (presence or absence of...

• Replies: 0
• Views: 1,067
07-14-2015, 05:16 AM
11. ### Approach to adjusting for multiple testing problem with multiple chi-square tests

Hi, I work in a UK university. Each year finalist students take part in a National Student Survey responding to 30 questions on aspects of their...

• Replies: 0
• Views: 1,153
07-14-2015, 05:00 AM
12. ### Calculating errors and surgery

Hello, I have a small research project running where I am comparing estimates of surgical difficulty to actual surgical difficulty. There are...

• Replies: 4
• Views: 1,201
07-14-2015, 02:08 AM
13. ### Statistical Method to Compare More than Two Sets of Means within a Single Dataset

Hello, I have spent days searching the internet on this subject but I keep turning up an answer for only two sets of means rather than multiple sets...

• Replies: 0
• Views: 475
07-13-2015, 11:03 PM
14. ### Looking for a measure of the variability of proportions.

Hi All, Here is my circumstance. I have sets of text data. In this data certain words are used more frequently than others. I am sure you have...

• Replies: 4
• Views: 1,228
07-13-2015, 09:33 PM
15. ### Regression analysis with non-integer event rates

I am working as part of a team on a relatively large dataset which has been subject to imputation analysis. One of my colleagues has pointed out...

• Replies: 13
• Views: 2,245
07-13-2015, 03:12 PM
16. ### I would like someone to help me with getting the Frequency from Relative Frequency

here are the relative frequency 0 is 0.135 1 is 0.288 2 is 0.231 3 is 0.173 4 is 0.096 5 is 0.058 6 is 0.019 here is the ?

• Replies: 1
• Views: 1,312
07-13-2015, 02:33 PM
17. ### Statistical test for comparing means of correlation coefficients

Suppose that I have two lists of correlation coefficients such as A = and B = . The correlation coefficients in A are independent to B. Now, I...

• Replies: 6
• Views: 1,650
07-13-2015, 09:05 AM
18. ### Confidence level and Margin of Error applied to Satisfaction surveys

Hello, New to the forum, relatively new to stats as well! So I think I've managed to confuse myself and am going around in circles with this, so help...

• Replies: 1
• Views: 1,021
07-13-2015, 02:36 AM
19. ### Calculating Standard Error of the Mean (SEM) from Values which individually have SEM

Hello all, So I'm working with a large data set. Each value is a mean of four values. The standard error of that mean (S.E.M.) is calculated as...

• Replies: 0
• Views: 1,163
07-12-2015, 08:31 PM
20. ### adjustment for multiple comparisons in meta-analysis

I wrote a meta-analysis on the use of two different drug regimens on the symptoms associated to endometriosis. Four papers were included in the...

• Replies: 5
• Views: 1,866
07-12-2015, 11:59 AM
21. ### How does "qpois(1-pvars, 3, .25) " work in R ?

R code : library(MASS) mu <- rep(0,4) Sigma <- matrix(.7, nrow=4, ncol=4) + diag(4)*.3 rawvars <- mvrnorm(n=10000, mu=mu, Sigma=Sigma) ...

• Replies: 0
• Views: 1,119
07-12-2015, 09:08 AM
22. ### How to calculate support and confidence?

How do I calculate support and confidence for the following table: (apriori) 2 3 3 2 2 0 7 1 1 0 7 2 3 1 7 1 1 1 3 1 where last column is...

• Replies: 0
• Views: 962
07-12-2015, 01:09 AM
23. ### Relative bias of estimates of multilevel logistic regression models

The post is little bit lengthy , but it will give you thorough information and you can run the code easily . Trust me , I believe the answer is...

• Replies: 0
• Views: 999
07-10-2015, 10:17 PM
24. ### Should I use Multiple Regression ?

I want to delete this post and I don't know how, please remove it.

• Replies: 0
• Views: 935
07-10-2015, 12:10 PM
25. ### Help required for a probability question: Conditional probability

If Flight A arrives at a random time between 9am and 11am, and Flight B arrives at a random time between 10am and 12am. What are the Odds that...

• Replies: 1
• Views: 1,119
07-10-2015, 05:17 AM
26. ### Statistical test to compare ratios of means?

Hello, This isn't a request for homework help per se, but a question that came up from a student while I was working as a teaching assistant. The...

• Replies: 1
• Views: 1,048
07-10-2015, 05:05 AM
27. ### Time series

Hello, I have a question about time series. I have two time series (very similar, they differ just due to the minor calculation method) and I...

• Replies: 0
• Views: 842
07-10-2015, 02:08 AM
28. ### Additional analysis of experimental data

Hi All! I'm a student in computer science and I need some advice. I have a data set of a repeated measures design experiment with two independent...

• Replies: 0
• Views: 1,312
07-09-2015, 10:02 AM
29. ### Comparing the fits of 2 continuous variables

Hi, I am new to this Forum and also new to using R. I have a data set with continuous x and y values that appear to be related in a exponential...

• Replies: 2
• Views: 1,142
07-09-2015, 07:46 AM
30. ### Which Adjusted Residual Formula is Correct?

http://www.geneseo.edu/~bearden/socl211/chisquareweb/chisquare.html This site says it is observed-expected/sqrt expected*row total proportion*column...

• Replies: 0
• Views: 1,663
Ker
07-08-2015, 02:55 PM
31. ### Moran I correlogram

Hi everybody, I have data on sampling points in a forest. I have been able to calculate Moran I for several distances and I have built the...

• Replies: 0
• Views: 1,210
07-08-2015, 01:33 PM
32. ### Statistical Test for non-probability sample?

Hi, I doing a mixed method study (sequential explanatory study). The first part of the study was the qualitative element (interviews). The output...

• Replies: 0
• Views: 760
07-08-2015, 07:27 AM
33. ### One subgroup drawn from four groups: by chance or not?

Dear all, I am new here and do not know much about statistics, but I have a question. Maybe somebody can help me. I have the feeling this is very...

• Replies: 6
• Views: 1,404
kfl
07-08-2015, 02:07 AM
34. ### homework problem has me stumped

A sample of n = 25 individuals is selected from a population with μ = 80, and a treatment is administered to the sample. Which set of sample...

• Replies: 4
• Views: 1,389
07-07-2015, 05:56 PM
35. ### 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: 1,886
07-06-2015, 03:45 PM
36. ### Find statistically significant variables and also where to split their range.

Hi, I want to find a way to split a dataset so that I can see not only the importance of each attribute on the label but also at what point it needs...

• Replies: 0
• Views: 994
07-06-2015, 01:34 PM
37. ### How to plot binary on scatter?

Ok, so forgive me for my ignorance in some areas of statistics but I am working with a binary output of: 0 and 1. I am also working with a kNN...

• Replies: 10
• Views: 1,833
07-06-2015, 07:57 AM
38. ### Eta squared or partial eta squared?

I have been wrestling with effect size for a while so wonder if anyone can help. I know spss reports the partial eta squared but is it wrong to use...

• Replies: 1
• Views: 1,721
07-06-2015, 06:58 AM
39. ### Is this family wise error?

Hi all, I would like to confirm if this is family wise error. I have Parameter A, B, C and D and I want to test if each of their distribution...

• Replies: 2
• Views: 930
07-05-2015, 09:13 PM
40. ### How many to Sample?

Hello everyone, I am running a model that requires 3 scenarios (scenarios about the future) as an input. There is a total of 20 scenarios that I...

• Replies: 0
• Views: 1,018
07-05-2015, 05:49 PM
41. ### Two-Stage Least Squares and independent variables

Hey guys, I did an OLS-regression with the following equation: unemployment rate = c + oilprice + exchangerate + export It met all the...

• Replies: 0
• Views: 1,308
07-05-2015, 12:39 PM
42. ### Multi-factor Analysis without all the combinations

Hi, I conduct an anova statistical analysis with 5 independent variable (2 levels each). The thing is that within 3 of those variables all the...

• Replies: 0
• Views: 698
07-05-2015, 09:02 AM
43. ### Assigment Question

Good Afternoon , I'm currently taking a stat class and I can not get the answer for this question , can someone help me: -- At one college ,...

• Replies: 2
• Views: 1,503
07-05-2015, 02:40 AM
44. ### Inventory Problem: % of Orders Filled by Existing Inventory

I am building a financial model for a online clothing rental business. One of the crucial inputs for the inventory is figuring out the probability...

• Replies: 1
• Views: 1,708
BGM
07-04-2015, 11:40 AM
45. ### How can I compare two bootstrap-generated distributions?

Hi everyone, I've generated variability around my single endpoint value with the bootstrap method (endpoint = intrinsic growth rate "r" ). I've...

• Replies: 2
• Views: 2,076
07-04-2015, 07:03 AM
46. ### Three parameter Weibull confidence intervals

I am using the Weibull distribution for reliability, mainly related to material fatigue. For the two-parameter fitting, there are methods for...

• Replies: 0
• Views: 925
07-03-2015, 09:40 AM
47. ### combining stratified sampling with sampling using an estimated error rate

If I have a historical estimated error rate for some population, can I divide the population into strata and then use the error rate to sample from...

• Replies: 0
• Views: 881
07-03-2015, 09:07 AM
48. ### number of independent samples

Hi all, I am conducting a systematic review for which I can only use results from independent samples. Now, I have 5 independent samples (A, B, C,...

• Replies: 2
• Views: 1,034
07-03-2015, 06:37 AM
49. ### Average car price

The average car prices for cars sold in a country are: COLOUR: Red: £14,000 Blue: £12,000 ENGINE SIZE: 1.5 litre: £12,000 2 litre: £16,000

• Replies: 2
• Views: 1,242
07-03-2015, 04:25 AM
50. ### Statistical analysis of veterinary data with missing values

Dear Forum, I am a veterinary student currently trying to analyse sets of data based on dogs with IBD. The dogs were scored using 2 scoring...

• Replies: 4
• Views: 1,505
07-02-2015, 11:58 AM
51. ### [Excel] How to keep track of metrics

I have a data table with 3 Columns that I want to be able to measure the performance for. Ex. Number| Stage | Date/time 111111 ...

• Replies: 2
• Views: 2,620
07-01-2015, 03:23 PM
52. ### Is a Z score of 21.4 a valid value?

Hi folks, I have a dataset that is highly skewed right. When calculating Z-score, I was expecting to see values up to as high as 6 (6 standard...

• Replies: 6
• Views: 1,602
07-01-2015, 10:24 AM
53. ### Comparing Test Scores

I feel like this is quite a simple question that I should really know the answer to but for some reason my brain won't reason with me so I must...

• Replies: 4
• Views: 1,449
07-01-2015, 07:03 AM
54. ### Random Odds and Percentage Question

Hi Everyone, I have a random question related to odds and percentage that I can't figure out. Does this statement in terms of the percentage...

• Replies: 4
• Views: 886
07-01-2015, 02:50 AM
55. ### kNN Classifier - not sure?

• Replies: 1
• Views: 1,013
06-30-2015, 11:11 AM
56. ### Is it better if it isn't statistically significant?

So I am having a discussion with a colleague about a paper that we are writing. We have some results that has 3 levels of 1 Factor (A, B, and C). ...

• Replies: 22
• Views: 4,826
06-30-2015, 09:02 AM

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