Recent content by obh

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    Compare Samples

    The test compares multiple groups (just press insert row ...) you should also ensure the totals are the same, for example compare observed: (10,20,30) to Expected (60,30,30) you should change the expected: |(60,30,30) to (30,15,15) calculation: { 60/120 *60=30, 30/120*60=15 ...} Please...
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    Compare Samples

    Hi Dik, You choose the weights, you may choose less dramatic weight differences between the "veggies", but in this case, you may not describe the reality correct. Another option is to add another measurement like the percentage of "professional people": 100 * (1222 - (10 + 22 + 11 +4) ) / 1222...
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    Compare Samples

    Hi Dik, Why are you interested in the relations between the 'different veggies' and not in the ratio between the total problematic cases (veggies) and the total members? You may consider giving different weight for each "veggie" , example: reprimand - 0.1 xxxx1 -0.3 xxxx2 -0.6 expulsion - 1...
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    Compare Samples

    Hi, Per my understanding the question, this is not a statistical question, but you can find a statistical test which does a similar comparison. I can suggest the Chi-square test for goodness of fit. Of course, don't forget this is not a chi-square test (if I understand your question...) Also...
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    Really, Really, Really need help

    I though you are talking about random process, if not it is very easy. Will you get the same result each time if you try the same weight and height several times? If yes, please find the point of crack, say the point when you raise one parameter by 0.1 and this change from non crack to...
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    Really, Really, Really need help

    Logistic regression will help you to calculate the probability of crack egg
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    Comparing 3 countings of a phytoplankton sample

    You can do one test if meet the test's assumptions. But I can see 2 problems : 1. If you are interested in accuracy for each SP several SP mistakes won't be detected. 2. Also If SP sizes are not similar, problems with the small sizes won't be detected. So for quality assurance I think it make...
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    Multiple linear regression

    Hi Gustavo, First I wouldn't necessarily count p = 0.062 as insignificant ...I don't really see a big difference between 0.06 or 0.05. I know that people usually use 0.05 as alpha. Also if you have a good theoretical reason to assume that D should be in the model you probably should keep it...
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    Multiple linear regression

    Why no luck?
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    Multiple linear regression

    Hi Gustavo, Did you check the correlation between the independent variables?
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    Not sure which statistical method to use to analyze results

    Hi Greta :) I'm not sure why do you want to do the chi-square test in this case? just comparing between Bladder 1 and bladder 2 may not give too much? I was leading to Logistic Regression if Kylemcat wants to predict the probabilities of Bladder 1 and bladder 2 based on the fractures. Also, In...
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    Not sure which statistical method to use to analyze results

    I assume you want to be able to predict what bladder injury base on the fractures? Or more accurately to determine the probability for Bladder 1 or bladder 2 based on the fractures? Otherwise it is only analysing the data. (example for bladder 1. 20% fracture 1 30% fracture 2 and 50% fracture 3
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    Not sure which statistical method to use to analyze results

    Hi Kylemcat, So patient #1 has 2 pelvic fractures #1 and #2 and suffers from less severe bladder injury? I assume the dependent variable is the bladder injury? I assume you have more than 2 patients?
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    Comparing 3 countings of a phytoplankton sample

    So if understand you correctly, you don't compare 3 different methods, but count 3 times and expect to get the same results. Since it is not an accurate method you won't get exactly the same results and you treat each count as a random variable. You want to quality test any SP separately and If...