# Compare slopes

*From*: biplabbose@xxxxxxxxx*Date*: 22 Sep 2005 12:17:47 -0700

We have two experimental data sets. Both of them have same independent

variable (X) and dependent variable (Y). For each value of X, we have

triplicate of Y data in each data set. We Plotted these data and fitted

to an equation Y = mX + 1 using MS Excel.

So we have got two linear equations fro these two data sets. Now we

want to compare the slopes of these two straight lines.

Our question: Are there any statistically significant difference

between these two slopes? Can you please let us know how to calculate

it? I am giving the data bellow:

First data set:

X Y

0.1 ---------- 0.66 0.68 0.67

0.2 ---------- 0.63 0.62 0.63

0.5 --------- 0.48 0.47 0.47

1.0 --------- 0.4 0.37 0.35

Second data set

X Y

0.1 ------- 0.38 0.39 0.38

0.2 ------- 0.33 0.34 0.37

0.5 ------0.32 0.31 0.33

1.0 ------ 0.24 0.24 0.25

With regards

Biplab

.

**Follow-Ups**:**Re: Compare slopes***From:*Bruce Weaver

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