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Least squares

Least squares

a principle of estimation invented by gauss in which the estimates of a set of parameters in a statistical model are the quantities that minimise the sum of squared differences between the observed values of the dependent variable and the values predicted by the model.


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Re: molar extinction coefficient

Once you have plotted the data and drawn the line, the slope is the rise/run, the dy/dx. You can count squares on the graph paper. On the other hand, you can put the values of x and y into a spreadsheet and run a linear regression. If you do that, be sure to go back to the ...

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by 2468
Sun Dec 02, 2012 2:38 am
 
Forum: General Discussion
Topic: molar extinction coefficient
Replies: 10
Views: 5304

Re: molar extinction coefficient

Once you have plotted the data and drawn the line, the slope is the rise/run, the dy/dx. You can count squares on the graph paper. On the other hand, you can put the values of x and y into a spreadsheet and run a linear regression. If you do that, be sure to go back to the ...

See entire post
by jonmoulton
Wed Nov 28, 2012 11:15 pm
 
Forum: General Discussion
Topic: molar extinction coefficient
Replies: 10
Views: 5304

Gene Frequency

Then you have to make all the Punnet squares including the frequencies, so e.g. AA × AA would be in 0.36x0.04 cases (hopefully:). But I don't know, whether there is some easier way.

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by JackBean
Tue Sep 04, 2012 10:00 pm
 
Forum: Genetics
Topic: Gene Frequency
Replies: 8
Views: 6622

difficult biology problem, appriciate ANY help!

... rollers if the dominant trait always shows over the phenotype of a recessive trait. Also my problem solving processes of making many punnett squares leads me to believe if the male has a dominant tongue rolling trait then the offspring have either a 100% or 50% chance of being able to roll ...

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by moriahlikesbeer
Tue May 15, 2012 4:11 pm
 
Forum: Genetics
Topic: difficult biology problem, appriciate ANY help!
Replies: 3
Views: 2335

Determining (P) plants from F2 data

... yellow shriveled. I think I have my conclusions all wrong. I have tried every combination I could think of. I have done a million punnent squares. I really do not think I am doing it right because I am not sure how to go from the F2 generation to the P generation. Any help in putting me ...

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by aiyana1228
Mon Mar 19, 2012 3:36 am
 
Forum: Genetics
Topic: Determining (P) plants from F2 data
Replies: 1
Views: 1522
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