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visits member for 2 years, 8 months
seen May 13 '12 at 20:29

Apr
15
comment What default theoretical distribution does Mathematica use in PearsonChiSquareTest?
thank you for your detailed and very helpful answer! I was unaware while conducting the tests, that while using NormDist[] it does directly use N(0,1), even though in retrospect it seems somehow logical :P.
Apr
15
comment What default theoretical distribution does Mathematica use in PearsonChiSquareTest?
and: in the example given in the question, there is more evidence to reject the H0 "any normal dist" than H0 N(0,1)? this seems a little counter intuitive...
Apr
15
comment Is there a function to calculate studentized range?
yes thank you apparently there is the ducan test directly. however, the calculation is simple and there seems to be no direct function, so i just leave it with the manual calcs.
Mar
7
comment How to match two sets of data over 1 or more identifier, of unequal length?
yes i tried it, the thing is the data I need to access are saved in a Access Database.. somehow I couldn't establish a link to the ms access directly...
Feb
28
comment How to solve for an Z-Score of a T-Distribution?
thank you for your help, both solutions work well, sometimes I feel like its very hard to compute with mathematica, the next time I think again its so convenient :P
Feb
5
comment Check in a series if there exists adjacent values with less than a certain number of missing values
thank you for your explanation: I used the following values: testsample = {0., 1., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.}; findLsts3[testsample, 4, 4]
Feb
4
comment Check in a series if there exists adjacent values with less than a certain number of missing values
thank you for the alternative solution!
Feb
4
comment Check in a series if there exists adjacent values with less than a certain number of missing values
additionally, it does not cover cases of a lot of zeros. so far: {0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} returns too much lists with zero. probably one has to just remove all lists where Count[zeros]=length resultlist. Edit: It Just occurs for len=maxZeros (and len<maxZero which goes against logic anyway).
Feb
4
comment Check in a series if there exists adjacent values with less than a certain number of missing values
Thank you a lot. Could you give me a brief explanation of rangelst{{1,2},{3,3},{5,4},{7,10},{8,11}} and the (#[[2]] - #[[1]]) >= 0 &]? I'm stuck here at the momens :s.. thanks a lot!
Feb
4
comment Check in a series if there exists adjacent values with less than a certain number of missing values
The Result looks correct, the random selection considers all possible list? I will find it out but I have to retrace the code (which will take a moment :P). Thank you a lot for your support!!
Feb
4
comment Check in a series if there exists adjacent values with less than a certain number of missing values
@J.M. getSamples[data, fixlen, maxzero, n]; getsamples[testsample, 4,1]: Leads to: {3, 1, 0, 5} {1, 0, 5, 5} {0, 5, 5, 1} {5, 5, 1, 2} … {4, 1, 4, 3} {1, 4, 3, 0} {0, 4, 1, 4} This is needed because: I need to (mostly) unbiased draw a random set of 1 year data (thus I will afterwards randomly select 1 valid list, if the experiment contains one). Dublicates needed as every resulting list is subject to another time frame.
Feb
4
comment Check in a series if there exists adjacent values with less than a certain number of missing values
@ heike: the length is fixed to 251 data point, this corresponds to 1 event day + 250 workdays, thus 1 year. An adaption of your solution would be to generate sublist of every resultlist > 250 days, but because I'm working with a lot of data this might not be the fastest version.
Feb
4
comment Check in a series if there exists adjacent values with less than a certain number of missing values
unfortunately its true that this only gives me list with no zeros. But i have a limit of 10 zeroes because 1 missing element would make a lot of experiments useless, even though they are of good quality, see Heike's ansatz..
Feb
4
comment Check in a series if there exists adjacent values with less than a certain number of missing values
thank you a lot for your answer. It's true I cannot use the previous answers as they only generate lists containing no zeros values. But I still have a Issue here: I'm working with time series: Thus I need to have the list {0,2,0,3} {2,5} too, as it correspond to different time data points. I will try to look trough the code, any Idea how to adjust? The Idea Behind: I will only need to Randomly pick 1 list of at least 250, but with a random date. Thus to not bias the statistics, I will need to have overlapping lists.
Feb
4
comment Check in a series if there exists adjacent values with less than a certain number of missing values
thank you both a lot for the answer, as I'm not a very advanced user yet, I will take my time and start to understand the code fully, I'll give feedback when i sucessfully (or not) implemented it ;)
Feb
4
comment How to Delete Elements from List1 appearing in List2?
yes this is true. I found Complement on google, but I need the result to be unsorted.
Feb
4
comment How to Delete Elements from List1 appearing in List2?
thank you a lot, I do have V.8 and it works perfectly! Thank you for the fast answer!