Good video for studying. I can identify problems with static position (neck), repetitiveness, noise and training issues regarding position of work and chair usage.
Hello, I am having airborne dust concentrations data as PM10, PM2.5, PM 1 . These data was taken before and during dust producing work in a civil construction site. N=5 How can i compare these before and during operations data ? It seems that there is percent variation in dust concentrations in atmosphere between before and during operation data. e.g., PM 10 ( particle size less than 10 microns) is sharing 40% of total airborne dust, and PM 2.5 ( particle size less than 2. 5 micron) shares 10% of total airborne dust. During machine operation: PM 10 shares 60% and PM 2.5 10% only. It seems that PM 10 share is increased due to that machine operation? Which test is suitable for analysing these type similar data for discussion ? How to use statistics? Any comparison among these particle sizes? thank u.
Theresa Stack Thanks a lot. Any idea on paired t test ? Here, Concentration of >1 ( greater than one) micron size particles includes >3 , >5 and >10 also. particle size before opns . during opns >1. 100%. 100% >3. 80%. 90% >5. 60%. 80% >10. 40% 70% should I go for individual particle size channel *mass readings* for testing? >3 micron separately >5 micron separately etc. >1 micron channel mass readings is considered as total mass and calculated as 100%. and other channels proportions in percent were calculated with respect to >1 micron channel mass value. for example ( dust mass value in channel >10micron / dust mass value in channel >1 micron) x100. Can I average the mass concentrations of dust for N observation rather than averaging the proportion in percent ? Thanks
Good video for studying. I can identify problems with static position (neck), repetitiveness, noise and training issues regarding position of work and chair usage.
Is this Peru?
Hello,
I am having airborne dust concentrations data as PM10, PM2.5, PM 1 .
These data was taken before and during dust producing work in a civil construction site.
N=5
How can i compare these before and during operations data ?
It seems that there is percent variation in dust concentrations in atmosphere between before and during operation data.
e.g., PM 10 ( particle size less than 10 microns) is sharing 40% of total airborne dust, and PM 2.5 ( particle size less than 2. 5 micron) shares 10% of total airborne dust.
During machine operation:
PM 10 shares 60% and PM 2.5 10% only.
It seems that PM 10 share is increased due to that machine operation?
Which test is suitable for analysing these type similar data for discussion ?
How to use statistics?
Any comparison among these particle sizes?
thank u.
I am sorry, there is not enough information to assist.
Theresa Stack
Thanks a lot.
Any idea on paired t test ?
Here,
Concentration of >1 ( greater than one) micron size particles includes >3 , >5 and >10 also.
particle size before opns . during opns
>1. 100%. 100%
>3. 80%. 90%
>5. 60%. 80%
>10. 40% 70%
should I go for individual particle size channel *mass readings* for testing?
>3 micron separately
>5 micron separately
etc.
>1 micron channel mass readings is considered as total mass and calculated as 100%. and other channels proportions in percent were calculated with respect to >1 micron channel mass value.
for example ( dust mass value in channel >10micron / dust mass value in channel >1 micron) x100.
Can I average the mass concentrations of dust for N observation rather than averaging the proportion in percent ?
Thanks