# Search results

1. ### Calculate Standard Error over averaged responses or raw responses?

I updated my answer, is it clear now? "Table1" doesn't throw any data away, it just uses it in a different way Both options are "correct" it is the question what do you want to show. Another simple example of tests results: subject,#students, mark history,1000,80 Math,10,90 The average of...
2. ### Calculate Standard Error over averaged responses or raw responses?

Okay, now I understand your question ... let's go to the edges: example A. If this is repeated sample: PPT1, condition A, item1, 33 PPT1, condition A, item1, 31 PPT1, condition A, item1, 35 In this case, it makes sense to take first the averages then calculate the standard deviation of the...
3. ### Calculate Standard Error over averaged responses or raw responses?

Do you mean all the observations of PPT1 are for the same person? say PPT1 - person1, PPT2 person2 etc ?
4. ### Calculate Standard Error over averaged responses or raw responses?

Hi, First, if this is a sample data you need to calculate Sample Standard Deviation using (n-1) instead of n. What is PPT? anyway if you want to calculate the standard deviation of a dependent variable you need to use all the data (table2) Mean:62.66667 S:18.371173
5. ### Paired vs unpaired t test

When you use dependent samples you use paired t. For example you compare the same person before treatment and after treatment. Can you paste some data for better understanding?
6. ### Correlation

Correct :), edge examples help to understand
7. ### Correlation

This is good. I prefer going to the edge. You should try(1,2,3,4,5,6) and(-3,-2,-1,0,1,2) And compare it to (1,2,3,4,5,6) and (7,8,9,10,11,12)
8. ### Correlation

I can answer your question, instead I will suggest a test. Build 2 perfect correlate set of data, one only positive and one half positive and half negative and see what result correlation you get...
9. ### Test & Control File Selection - Help

1- it's not bad practice to sort on the identified key variable and select the test records using every 2nd record and that using Stratified Sampling is however a better method? I thought you mean taking totally randomly files every second one without sorting. sorting probably will be good as...
10. ### how to automatically repeat the same analysis

Hi Css, I glad I could help you :) Of course, the page is not a substituted to SPSS or R ...but it can do the job in your case and many other cases, hopefully easily... Actually, I didn't notice it was an SPSS question ... I tested it successfully in google chrome with 3 X columns and 50 Y...
11. ### Test & Control File Selection - Help

"Hi obh, yes i believe you are referring to stratified random samples which is one of my options. As to why every second record - I am however the whole prospect file into two 50% files therefore sorting on my key variable (say age) and taking every 2nd (even) record as the test and every odd...
12. ### how to automatically repeat the same analysis

Hi css, Please check the "Coefficient table", "Stand Coeff" column.
13. ### Test & Control File Selection - Help

I don't understand why every second record? A simple example (hopefully I understand you correctly): Let assume your main variable is color: 40% red, 60%blue. You want to take a sample of 10% and change the message in this sample. (to check if the message change will influence Y) If instead...
14. ### Test & Control File Selection - Help

If you know the standard deviation from the entire population you should use z-test. if you calculate the standard deviation only from the sample you should use the t-test. Before ...can you plan your sample to have a similar key variable, instead of taking it randomly and then test it?
15. ### Test & Control File Selection - Help

Generally, it is better to use the t-test if you don't know the population standard deviation. t limit to Z when n limit infinity, and when n>30 z will also give you a reasonable result. but I assume it is relevant to the time people used tables instead of computers ... to reduce the standard...
16. ### Logistic regression

Hi Arn, Please don't say that about yourself :( If you paste your data in the following link you will have a bit better explanation: http://www.statskingdom.com/420logistic_regression.html If you still have a specific question please let me know
17. ### how to automatically repeat the same analysis

Okay, It should not be a problem.
18. ### how to automatically repeat the same analysis

Hi Css, I assume that you want to standardized the data before performing the regression.? It should not be a problem. Do you need both standardize and not standardized? I will check tomorrow. Please check my answer tomorrow :)
19. ### how to automatically repeat the same analysis

Coefficients are there (coeff in the second table) . Generally, you need to check in "Residuals Table" or/and " ANOVA Table" or/and... to get more data. I assume it should be okay now. If still not okay, can you please show an example of how you like it to be? (includes the residuals) and I...
20. ### how to automatically repeat the same analysis

Hi CSS, What is the problem with the current page? What data does it miss? If you clean the "cached images and files" you will see also the ANOVA table.