deviation

  1. M

    Study population mean as a reference for COX-regressions in SPSS

    Hi! I'm a medical student doing my master thesis. In my analysis I intend to compare two different systems for subclassing stroke as per ethiology. I have 1300 patients subtyped according to both these systems. I also have information of longterm outcome for these patients in terms of...
  2. D

    How to find the error or deviation, in this case?

    Hi I have two data sets, for example A and B. Where A is produced from the experimental work and B is evaluated based on mathematical modeling. Now, I have to compare these two data sets and find the error between experiemntal and calculated values. A (experimental)= [1 2 3 4 5 6 7 8 9]...
  3. P

    Standardized Coefficients - Unit Problem?

    Dear all, I am new to this forum and already wanted to thank all for reading and/or helping. I could unfortunately not find the answer to this question anywhere, or maybe I just misread... I have a little problem after running a multiple linear regression on XLSTAT. I have a dependent...
  4. J

    How to calculate standard error for win rates of sampled data

    Hi Forum, I'm working on a problem regarding win rates and can't find a good solution for calculation of standard error of my results. I have two groups playing games against each other. I want to calculate the win rate for Team A (then WR of Team B is 100%-WR of Team A). To do so, I...
  5. M

    Confidence intervals for multiple proportions

    Hi everyone, I would like to know how to calculate confidence intervals for non-binomial proportion data of which I have multiple samples? I'll give an example to clarify: Proportion1 Proportion2 Proportion3 Proportion4 Proportion5 Proportion6 Sample1 0.93926 0 0.00204 0.0585 0.0002 0...
  6. S

    "Unknown Factor" needed

    Good Day All I am currently handling a temperature estimation project related to drop of temperature for different type of liquid in storage tanks. The scenario is like this - There are 14 Tanks filled with different type of liquid (max 4 types). I am also taking Air Temp in consideration. So...
  7. E

    Calculate Probability of a value greater than knowing the Mean, St Deviation...?

    I need to Calculate the probability of get 20000 or more with the following statistics; Statistics: Forecast values Trials 5,000 Base Case 0.00 Mean 14,755.75 Median 10,993.67 Mode --- Standard Deviation 10,519.67 Variance 110,663,505.00 Skewness 1.45 Kurtosis 4.40 Coeff. of...
  8. M

    Measure Variability of data points

    I'm struggling to find the appropriate solution to a project that I'm working on. I am trying measure the variability of lead time on products that we purchase I can't figure out what an appropriate calculation would be. Below are some of the details. - I'm trying to compare vendors. Some...
  9. B

    total deviation of the sum of unrelated means

    As a starter - I am a newbie to this forum (and forums in general). Also, I have a very (very) basic understanding of stats/prob. Thank you in advance for your patience and please don't hesitate to provide feedback that will help me, help myself more efficiently! I am trying to compute the...
  10. J

    Why does sample std dev underestimate population std dev?

    The subject line is too short for me to word out my question properly: Why does (square root of unbiased estimator for population variance) underestimate population standard deviation? Refering to this wikipedia page Unbiased estimation of standard deviation, it says that "it follows from...