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lazybonezzzSend an Instant Message to lazybonezzz  




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Quick Scroll PSM : purpose of a double blind study is to--- 09.28.05 (2 years ago) #1
1avoid observer & subject bias
2avoid observer bias & sampling variation icon_rolleyes.gif
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Quick Scroll 09.28.05 (2 years ago) #2
1)IS THE ANSWER...AS IN THIS THE OBSERVER

DOES NOT KNOW WHAT THE SAMPLES ARE

GETTIN AND SAME WITH SAMPLES..EVEN THEY

DONT KNOW WHETHER THEY ARE GETTING DRUG

OR PLACEBO,,SO THE OBSERVER AND SUJECT

BIAS IS AVOIDED...



AND FOR OPTION TWO I THINK IT IS APPLICABLE

IF DOUBLE BLIND( AND ALSO IF THE OBSERVER

DOESNOT KNOW WHAT IS GIVEN TO WHICH

GROUP OF THE SUBJECTS ,,,,THIS WILL ELIMINATE

OBSERVER BIAS) AND CROSS OVER

STUDY IS DONE(FOR AVOIDING SAMPLING

VARIATION BECAUSE BOTH GROUP RECEIVES

DRUG AND PLACEBO IN DUE COURSE OF TIME....
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Quick Scroll 09.29.05 (2 years ago) #3
adi cudu tell me where in park crossover study & sampling variation is mentioned???
it sats doble blind study avoids observer bias & subject variation now is that same as subject bias or sampling variation???
coz ans given is 2
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Quick Scroll 09.29.05 (2 years ago) #4
no its not in park!!!!
it was taught to us!!!!
park does not have much of these things...
i had referred a book given to me by a PG in my UG life...
and i dont remember the name(as usual my very weak memory came in my way)... icon_sad.gif sorry!
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Quick Scroll 09.29.05 (2 years ago) #5
thanx 4 helpin out these PSM q really boggle me!
plus theres no second book 2 refer2
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Quick Scroll 09.29.05 (2 years ago) #6
Sampling variation is the difference that you will inevitably find between the statistics that describe any two or three samples taken from a single population. There will always be variability between samples
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Quick Scroll 09.29.05 (2 years ago) #7
sampling variation– The unaccounted fluctuations (random error) in results as exhibitedrom one sample to the other
DOUBLE BLINDING means the oobserver & subjects r unaware it removes bias so ans shud b 1
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