I ordered a kilogram of powdered piracetam along with a Cap-M-Quik capsule capping machine and thousands of 000-size capsules.
I weighed 10 of the capsules while empty. The mean was 0.161g with a standard deviation of 0.0034g, the max was 0.168g, and the minimum was 0.157g.
The cap-m-quik machine can fill 50 capsules. I crushed some, but not all, of the piracetam powder, as some of it came in rocks. This would be important to do on the next run. In total I weighed about 50.1g of piracetam powder and placed it on the capsule machine.
After I finished, I wrote down the weight of the filled capsulse. The following calculations subtract the mean of an empty capsule (0.161g) out.
standard deviation: 0.01830g
It is satisfying to know that without fully crushing all of the piracetam rocks, the full capsules have a sigma of only 20mg and a range of 100mg, given that I will be taking 5g doses. All statistics were compiled with R.
I collected the powder that fell out of the machine after I was done capping, and weight 0.170g.
It took me 3:30 to set up the bottom portion of the capsules and 4:06 to put the heads on. It took me 8:59 to weigh and record each full capsule. This time I patiently crushed all the rocks into smaller rocks and then into fine powder. Ironically, this gives worse results:
Standard Deviation: 0.05505
After carefully crushing the powder very fine, the sigma is .055 compare to .018 on round one. The range is especially bad: almost three-tenths of a gram compared to almost one-tenth of a gram. However, the following histogram shows that it is pretty good:
This time I only crushed the big rocks into smaller rocks that could fit into the caps and did not bother crushing to powder. It took me 3:48 to set the bottom caps up and 4:06 to put the head caps on. While the standard deviation was less than round 2, the range increased and my minimum fell to 7 and a half tenths.
standard deviation: 0.04728g
Crushed the big rocks and somewhat repeated the style of round 2
standard deviation: 0.04128g
This time I actually just dumped the powder onto the capsule machine after I weighed it regardless of rock size. After I pushed the powder around, I took the remaining rocks that were too large and crushed them, then pushing that powder in again.
standard deviation: 0.06766g
Statistics for the aggregation of all 5 samples:
standard deviation: 0.04839g
Here is a histogram of the 5 rounds aggregated:
Here are some statistics on the statistics:
Mean of means: 0.99084g
standard deviation of means: 0.00209
max of means: 0.99238g
min of means: 0.98720g
range of means: 0.00518
mean of variances: 0.00238g
standard deviation of variances: 0.00157g
max of variances: 0.00459g
min of variances: 0.00034g
range of variances: 0.00424
mean of standard deviations: 0.04592g
standard deviation of standard deviations: 0.01832g
max of standard deviations: 0.06766g
min of standard deviations: 0.01832g
range of standard deviatiosn: 0.04936g
mean of maximums: 1.0840g
standard deviation of maximums: 0.04033g
maximum of maximums: 1.1290g
minimum of maximums: 1.050g
range of maximums: 0.0790g
mean of minimums: 0.8398g
standard deviation of minimums: 0.08768g
maximum of minimums: 0.9550g
minimum of minimums: 0.7510g
range of minimums: 0.2040g
mean of ranges: 0.2442g
standard deviation of ranges: 0.3780g
maximum of ranges: 0.3780g
minimum of ranges: 0.0950g
range of ragnes: 0.2830g