What article?

Jerry

Rosario wrote:

Hi Jarry,
I have done the calculation after a log transformation, but my result
doesn't match the one I have posted.
Either my calculations or the result, I've already posted (I read it
in a sientific article), are wrong... What do you think about?
thanks a lot

"Jerry W. Lewis" wrote in message ...

Something doesn't add up here. The average of the ratios (128.8%) is
not contained in your confidence interval. Also, either the data
contain some outliers, or you must transform to approximate normality
before using the t-distribution, since the distribution of sample ratios
is skewed (e.g. 1367.1/232.78 = 587.3%)

Jerry

Rosario wrote:


Dear all,
I have a problem with some statistic calculation.
I have 2 series of measu the first column is the test series and
the second column if the reference series.
I have to calculate the standard 90% confidence intervals of the ratio
test/reference (T/R) and I have to answer to this question: the
products were considered bioequivalent if the difference between two
compared parameters was found statistically insignificant (P < 0.05)
and 90% confidence intervals for these parameters fell within 80-120%.
I know the result for these series, but I have more to calculate:
90% CI : 88.1-115.6%
Two one-sided t-test probability (Probability for T/R ratio (r) to be
within 0.8 and 1.2) : 0.98
Someone can explain or suggest me an internet reference to solve this
problem.

Thanks a lot


5724.4 5204.49
1518.37 1172.63
1186.72 1720.13
805.7 2390.36
1155.86 762.54
2380.6 3050.71
1077.61 1044.55
1755.64 1760.97
973.11 1196.18
689.05 702.22
1323.86 1399.5
1367.1 232.78
3092.67 3354.46
1730.24 1475.54
1070.01 1381.2
1803.08 1454.36
2507.96 2160.75
2051.32 1192.23
1181.96 1220.58
1097.87 395.9
1339.46 1431.47
3610.07 2995.25
847.34 869.04
1655.91 1436.13
1285.73 3253.84
2044.78 1185.02