# What is difference between catnip

Plasma and serum are two frequent terms which are used alternately. It is believed that 8% of total body weight is due to blood. Blood is mainly composed of plasma, serum, white blood cells and red blood cells. White blood cells play very important role in immune system (Body’s defense system) whereas red blood cells involve in transportation of oxygen.

Plasma and serum are components of blood and routinely used for blood testing. Serology is the branch of medical science that is involved in study of blood serum. Following are the key points that could be helpful in understanding the difference between plasma and serum.

Serum is that part of blood which is similar in composition with plasma but exclude clotting factors of blood. Fibrinogen is a protein that is involved in blood coagulation. Fibrinogen is an inactive protein and it performs its functions by converting into fibrin (active form of fibrinogen). Plasma is considered as the medium of blood in which RBCs (Red Blood Cells), WBC (White Blood Cells) and other components of blood are suspended. Plasma proteins with their percentage is indicated below;

mid-14c., from Old French difference (12c.) "difference, distinction; argument, dispute," from Latin differentia "diversity, difference," from differentem (nominative differens ), present participle of differre "to set apart" (see differ ). Sense of "a quarrel" first attested late 14c. Colloquial phrase what's the diff? first recorded 1896.

difference dif·fer·ence (dĭf'ər-əns, dĭf'rəns)
n.
The magnitude or degree by which one quantity differs from another of the same kind.

Difference in differences has long been popular as a non-experimental tool, especially in economics. Can somebody please provide a clear and non-technical answer to the following questions about difference-in-differences.

What is a difference-in-difference estimator?
Why is a difference-in-difference estimator any use?
Can we actually trust difference-in-difference estimates?

To see the effect of a treatment we would like to know the difference between a person in a world in which she received the treatment and one in which she does not. Of course, only one of these is ever observable in practice. Therefore we look for people with the same pre-treatment trends in the outcome. Suppose we have two periods $t = 1, 2$ and two groups $s = A,B$. Then, under the assumption that the trends in the treatment and control groups would have continued the same way as before in the absence of treatment, we can estimate the treatment effect as $$\rho = (E[Y_{ist}|s=A,t=2] - E[Y_{ist}|s=A,t=1]) - (E[Y_{ist}|s=B,t=2] - E[Y_{ist}|s=B,t=1])$$

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Plasma and serum are two frequent terms which are used alternately. It is believed that 8% of total body weight is due to blood. Blood is mainly composed of plasma, serum, white blood cells and red blood cells. White blood cells play very important role in immune system (Body’s defense system) whereas red blood cells involve in transportation of oxygen.

Plasma and serum are components of blood and routinely used for blood testing. Serology is the branch of medical science that is involved in study of blood serum. Following are the key points that could be helpful in understanding the difference between plasma and serum.

Serum is that part of blood which is similar in composition with plasma but exclude clotting factors of blood. Fibrinogen is a protein that is involved in blood coagulation. Fibrinogen is an inactive protein and it performs its functions by converting into fibrin (active form of fibrinogen). Plasma is considered as the medium of blood in which RBCs (Red Blood Cells), WBC (White Blood Cells) and other components of blood are suspended. Plasma proteins with their percentage is indicated below;

What is difference between catnip
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