# weighted data

1. ### Weighted paired-sample t-test?

We have school-level data for 200 schools, 100 of which participated in a PD (professional development) program. For each school, we have an average test score, as well as the corresponding standard deviation, variance, and count of records associated with that average score. I have come across...
2. ### Can a ratio of performance be used to measure dependence and assign weights in a weighted average?

With only a modest grasp of inferential stats and maths in general, I've been wondering how one might derive the weights for a weighted average from a variable that isn't as straightforward as a frequency score. Consider the following scenario. Let's say I have measurements of effectiveness for...
3. ### N changes when weighting cases in SPSS

Hello! I'm stuck here while analyzing data in SPSS and I could really use some help. I'm weighting cases in my dataset, but when I run any analysis the N in the output has changed from 189 to 176. This puzzles me, each case has a weighted value when I check my dataset. Where do I go wrong? This...
4. ### Finding shifts in weighted data

Hello everyone, I'm working with large data sets in which every element has its own weight. In this sample different changes (shifts, scales, shifts & scales, even distribution changes) are possible. I'm trying to solve the problem of locating and determining shifts in it. By the moment I've...
5. ### Analyzing & weighing satisfaction survey data results.

I have a question for the group, say I'm a restaurant owner that distributes a satisfaction survey to my customers, asking them to rate multiple aspects of their visit on a scale from 1-5 (1 being terrible, 5 being excellent), then say I also ask them how important/significant is each aspect...
6. ### correlating many time series to find functional pairs

Hi there, I'm a neuroscientist in deep water, trying to do things that aren't standard in my field. I have a strong feeling there are established methods for this, so please give some input if you can! Data (very simplified but illustrates the issue): - From 20 humans, I have...
7. ### How to generate a table with weighted values and percentages of the variables used?

Hi all, I've been looking all over the web for a solution to this but to avail! So, I'm turning to this forum for a solution, if it exists! I want to generate a cross tabulation (between 2 variables) in Stata and have the resulting table to show both the weighted values and the percentages...
8. ### Cronbach's alpha with weighted data

Hi I have a test whose reliability I want to calculate, using Cronbach's alpha. The first 18 questions are scored 0 or 1 (right or wrong). The final 7 questions are scored 0, 1 or 2 (because they are not dichotomously right or wrong, there exists a 'half right' possibility). Is it correct...