90th Percentile :
The 90% tells
you the values for which 90% of the data points are smaller and 10% are bigger.
(OR)
The 90th
percentile is the value for which 90% of the samples were less than that value
90the percentile means the highest response time among the best passed
90% of the attempts of the transaction.
For an example, the transaction passed for 20 times. So 90% of 20 values would
be 18 i.e. LR will take 18th value is the best response times for
that transaction and will report highest among those. This in turn means (90
percentile means) 90% of the response times are less than or equal to this particular
number
This 90th percentile value is considered as the benchmark
Statistical Steps to calculate the 90th
percentile value:-
The 90th
percentile is a measure of statistical distribution.The 90th percentile
tells you the value for which 90% of the samples were
less(Smaller)
than that value and 10% are bigger.
Steps
1. Sort the
transaction instances by ascending order.
2. Count the
total number of transactions Say T.
3. Calculate
90/100 * T = Position (P)
4. This
calculated position (P) contains the 90th percentile value (V).
Example 1:
There are
certain instances of transaction "t" with the values
1,3,2,4,5,21,7,8,12,6,28,8,17,22,13,2,11,15,14,3 (in sec).
1.Sort by value
-- 1,2,2,3,3,4,5,6,7,8,8,11,12,13,14,15,17,21,22,28
2. Count the total
number of transactions;(T)= 20.
3. Calculate Position (P) = (90/100) * T = 18;
4. Position 18
contains the 90th percentile value(V) =21;.
Simple Explanation :
90%
Response Time (RT) is the one factor we should always look in once the analysis report gets generated to
calculate the 90% RT.
- Sort the transaction RT by their values.
- Remove the top 10% instances
- The higher value left is the 90% RT.
Ex:
Consider we’ve
a Script with transaction name “Trans(Ti)-testing” and there are 10 instances
of this transaction i.e we run this transaction for 10 times.
- Values of transaction 10 instances are;
T1 T2 T3 T4 T5 T6 T7 T8 T9 T10
3
|
5
|
1
|
3
|
9
|
6
|
7
|
2
|
4
|
5
|
Sec
- Sort them by their values
T3 T8
T1 T4 T9 T2 T10 T6
T7 T5
1
|
2
|
3
|
3
|
4
|
5
|
5
|
6
|
7
|
9
|
Sec
- Remove the top 10% value i.e here 9 sec (T5)
T3 T8 T1 T4 T9 T2 T10 T6 T7 T5
|
1
|
2
|
3
|
3
|
4
|
5
|
5
|
6
|
7
|
|
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