combining

1. Standard Deviation of a Sequence of Standard Deviations

Hi, My goal is to estimate arrival times of buses at bus stops where historical GPS data for each bus is available and real-time bus location is available for each bus. What I would like to do is use the historical data to determine the mean time (in seconds) and SD taken for a bus to travel...
2. Combining two ORs with the same control group

Hi everybody. I am doing a meta-analysis of observational studies. As the disease I am working on has different stages, some of the studies reported ORs(95%CI) for each stage separately in comparison to a single (shared) control population. I wonder if we can combine these two ORs (and their...
3. Combining Symmetrized Percent Change (SPC) values

Hello Talk Stats members, I'm relatively new to statistics, so please let me know if I'm off course! I was wondering if a total symmetrized percent change (SPC) could be calculated from two separate SPC values using weighting as can be done for percent change values. e.g....Total SPC in...
4. Combining samples for EFA

Hello, I have conducted an experiment in two different countries. The experiment included a survey. The same survey was used. Is it valid to combine the two sets to perform exploratory factor analysis, or there will be a scale effect (e.g. as in the case of logit choice models). Thank you
5. Combining Bernoulli distributions

Combining Bernoulli distributions [Solved] I'm looking for a way to find the standard deviation of a certain distribution. This distribution is created by performing n_0 Bernoulli trials with probability p_0. The number of successes is recorded as n_1. n_1 Bernoulli trials are then performed...
6. What statistics to use to find a possible correlation of coinciding null results?

I would like your advice on the following problem: I am investigating the following data: For 600 trials data was gathered simultaneously from two sources (locations in rats brain). Each trial was investigated and either a result was found (some time stamp) or no result was found (a "zero...
7. Need Help Combining 6 Graphs into One

Hello, I am an undergraduate student in biology. I have not yet completed a statistics course but I do have basic familiarity with graphing in excel. Here is the problem: We did an experiment in lab and we are supposed to write up a lab report which includes graph. We are given the...