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# Thread: Diff b/w the avg of Summary rep & Trans resp. rep

1. ## Diff b/w the avg of Summary rep & Trans resp. rep

Hello All

Is there any difference in calculating average Analysis shown on summary report and transaction response time?

Is there any difference between the number of data points used?

Thanks and regards,

Xhings

2. ## Re: Diff b/w the avg of Summary rep & Trans resp. rep

Yes there is difference.

Avg. response time on summary page is calculated using all raw data considering applied filters

While for Avg. transaction time graph, granularity is additional factors comes into picture which decide # of data points.

Lowest granularity possible is 1 sec. all response time data within one sec would be first averaged and shown as one data point. So effectively Graph would have less nos. of data points compared to summary report.

3. ## Re: Diff b/w the avg of Summary rep & Trans resp. rep

If I get you correctly, summary page shows average of all available data points while Transaction response report graph first does avg. for under 1sec data points and then does the overall avg.

According to my understanding, complete avg. or avg. by parts are no different.

Suppose I have 8 raw data points, with out any applied filter:
{5.2,5.4,5.7,5.8} in 1st second and
{5.3,5.5,5.6,5.2} in 2nd second.

If we first do an avg. of all the available data points (as summary report), we have:
43.7/8 = 5.4625

and for trans response graph avg. should be an avg. of avg which is:
{avg(first set)+avg(second set)}/2 = {5.525 + 5.4}/2 = 5.4625

Please let me know, if my understanding is correct or I am missing something here.

I found response time having lower avg. value for Avg. transaction response time graph than the summary report.

Is it possible that Summary Report simply ignores under one second response time data points while the other considers it but could show graph only with 1 sec. precision?

Regards,
Xhings

4. ## Re: Diff b/w the avg of Summary rep & Trans resp. rep

Understanding you explained in Calculation is not correct …

Look at following example ….

You have following Raw data set
{ 5, 4.5, 6, 7.8, 3.2, 4.5, 1.2, 3.5} Avg = 4.46

Now out of which 4.5, 6, 7.8 data points are within 1 sec time duration so your graph data point would be

{5, 6.1, 3.2, 4.5, 1.2, 3.5} Avg = 3.91

Where 6.1 is average of 4.5, 6, 7.8

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I found response time having lower avg. value for Avg. transaction response time graph than the summary report.

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Yes this is possible look at above example

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Is it possible that Summary Report simply ignores under one second response time data points while the other considers it but could show graph only with 1 sec. precision?

[/ QUOTE ]

No, you can check this by Averging raw data is excel

5. ## Re: Diff b/w the avg of Summary rep & Trans resp. rep

I got it now.

Thanks A\$H.

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