STDEV help

enagy

New Member
Joined
Jan 30, 2017
Messages
7
Could someone help me, please?
I have column A (timeline) and column B (corresponding heart frequency data).

We enter timepoint 1 into a cell (beginning of the measurement - entered into E1) and timepoint 2 (end of the measured period) into E2. I'd like to know the average heart rate for that given period and the STDEV of the heart rate data.
In E 3 we calculate the corresponding average of the heart rates :

[FONT=&quot][/FONT]=AVERAGEIFS(B2:B10000,A2:A10000,">="&E1,A2:A10000,"<="&E2)

I don't know how to calculate the corresponding standard deviations of the above data.

I would be very grateful for help, it is to make my students' work less easier in a psychology project.
thank you!
 

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Stiuart_W

Well-known Member
Joined
Jul 3, 2013
Messages
516
In column c add formula =(b2-$E$3)^2 (I have assumed that you have a header in A and B. then fill this down

In E4, say, enter = SQRT((sumifs(B2:B10000,A2:A10000,">="&E1,A2:A10000,"<="&E2)^2/countifs(B2:B10000,A2:A10000,">="&E1,A2:A10000,"<="&E2)-1)))

NB. I haven't tested this
 

enagy

New Member
Joined
Jan 30, 2017
Messages
7
Thank you, Stuart for the fast help. Unfortunately I get 'too few arguments for this function' note when I try to enter this.
Emese
 

shg

MrExcel MVP
Joined
May 7, 2008
Messages
21,763
Office Version
2010
Platform
Windows
A​
B​
C​
D​
E​
F​
G​
H​
1​
Point
Time
BPM
2​
1​
12:32​
72​
Beg
12:34​
3​
G2: =MATCH(F2, $B$2:$B$17)
3​
2​
12:33​
73​
End
12:45​
14​
G3: =MATCH(F3, $B$2:$B$17)
4​
3​
12:34​
75​
5​
4​
12:35​
72​
Avg
73.6​
G5: =AVERAGE(INDEX($C$2:$C$17, G$2):INDEX($C$2:$C$17, G$3))
6​
5​
12:36​
70​
SD
3.4​
G6: =STDEV(INDEX($C$2:$C$17, G$2):INDEX($C$2:$C$17, G$3))
7​
6​
12:37​
68​
8​
7​
12:38​
70​
9​
8​
12:39​
71​
10​
9​
12:40​
73​
11​
10​
12:41​
75​
12​
11​
12:42​
78​
13​
12​
12:43​
77​
14​
13​
12:44​
77​
15​
14​
12:45​
77​
16​
15​
12:46​
76​
17​
16​
12:47​
78​
 

enagy

New Member
Joined
Jan 30, 2017
Messages
7
Thank you very much for this help, it works beautifully! I am very happy, thank you again!!!
Emese
 

shg

MrExcel MVP
Joined
May 7, 2008
Messages
21,763
Office Version
2010
Platform
Windows
You're welcome.
 

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