Why trending line of scatter plot doesn't match given equation?

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1
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I have some sample data, I draw a trending line which gives me equation as well. But I found that the trending line sometimes isn't trustworthy at all.

The trending line graph doesn't match the equation!

I think that's unacceptable and totally out of my expectation. Why is it?

Sample data:

count(x)    runtime(y)

1000         0.1

2000         0.8

4000         6.4

8000         51.1

How to reproduce it: Draw a scatter plot, add a trending line, choose Exponential. Then try to calculate by the given equation, when x = 4000, 7000, 8000. And you can see y doesn't match the graph at all.

fileLink: https://anonfile.com/A4m0F7lbb3/sheet1_-_copy_xlsx

Screenshot:

enter image description here

edited Nov 21 at 15:57

asked Nov 21 at 15:51

Rick

1085

@cybernetic.nomad Got same result, my friend. They're the same equation I think.
– Rick
Nov 21 at 16:16

You are correct. I can't explain it either
– cybernetic.nomad
Nov 21 at 16:31

add a comment |

up vote
1
down vote

favorite

I have some sample data, I draw a trending line which gives me equation as well. But I found that the trending line sometimes isn't trustworthy at all.

The trending line graph doesn't match the equation!

I think that's unacceptable and totally out of my expectation. Why is it?

Sample data:

count(x)    runtime(y)

1000         0.1

2000         0.8

4000         6.4

8000         51.1

fileLink: https://anonfile.com/A4m0F7lbb3/sheet1_-_copy_xlsx

Screenshot:

enter image description here

edited Nov 21 at 15:57

asked Nov 21 at 15:51

Rick

1085

@cybernetic.nomad Got same result, my friend. They're the same equation I think.
– Rick
Nov 21 at 16:16

You are correct. I can't explain it either
– cybernetic.nomad
Nov 21 at 16:31

add a comment |

up vote
1
down vote

favorite

I have some sample data, I draw a trending line which gives me equation as well. But I found that the trending line sometimes isn't trustworthy at all.

The trending line graph doesn't match the equation!

I think that's unacceptable and totally out of my expectation. Why is it?

Sample data:

count(x)    runtime(y)

1000         0.1

2000         0.8

4000         6.4

8000         51.1

fileLink: https://anonfile.com/A4m0F7lbb3/sheet1_-_copy_xlsx

Screenshot:

enter image description here

edited Nov 21 at 15:57

asked Nov 21 at 15:51

Rick

1085

I have some sample data, I draw a trending line which gives me equation as well. But I found that the trending line sometimes isn't trustworthy at all.

The trending line graph doesn't match the equation!

I think that's unacceptable and totally out of my expectation. Why is it?

Sample data:

count(x)    runtime(y)

1000         0.1

2000         0.8

4000         6.4

8000         51.1

fileLink: https://anonfile.com/A4m0F7lbb3/sheet1_-_copy_xlsx

Screenshot:

enter image description here

microsoft-excel

edited Nov 21 at 15:57

asked Nov 21 at 15:51

Rick

1085

edited Nov 21 at 15:57

asked Nov 21 at 15:51

Rick

1085

edited Nov 21 at 15:57

asked Nov 21 at 15:51

Rick

1085

asked Nov 21 at 15:51

Rick

1085

asked Nov 21 at 15:51

Rick

1085

@cybernetic.nomad Got same result, my friend. They're the same equation I think.
– Rick
Nov 21 at 16:16

You are correct. I can't explain it either
– cybernetic.nomad
Nov 21 at 16:31

add a comment |

@cybernetic.nomad Got same result, my friend. They're the same equation I think.
– Rick
Nov 21 at 16:16

You are correct. I can't explain it either
– cybernetic.nomad
Nov 21 at 16:31

@cybernetic.nomad Got same result, my friend. They're the same equation I think.
– Rick
Nov 21 at 16:16

You are correct. I can't explain it either
– cybernetic.nomad
Nov 21 at 16:31

add a comment |

1 Answer
1

active

oldest

votes

up vote
1
down vote

accepted

Found it:

The problem is the equation has some rounding in it. If you right-click on it and select Format trendline label:

enter image description here

You can add decimal places:

enter image description here

and get a more precise result:

enter image description here

answered Nov 21 at 16:58

cybernetic.nomad

1,134111

You are a genius!
– Rick
Nov 22 at 1:22

add a comment |

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

up vote
1
down vote

accepted

Found it:

The problem is the equation has some rounding in it. If you right-click on it and select Format trendline label:

enter image description here

You can add decimal places:

enter image description here

and get a more precise result:

enter image description here

answered Nov 21 at 16:58

cybernetic.nomad

1,134111

You are a genius!
– Rick
Nov 22 at 1:22

add a comment |

up vote
1
down vote

accepted

Found it:

The problem is the equation has some rounding in it. If you right-click on it and select Format trendline label:

enter image description here

You can add decimal places:

enter image description here

and get a more precise result:

enter image description here

answered Nov 21 at 16:58

cybernetic.nomad

1,134111

You are a genius!
– Rick
Nov 22 at 1:22

add a comment |

up vote
1
down vote

accepted

Found it:

The problem is the equation has some rounding in it. If you right-click on it and select Format trendline label:

enter image description here

You can add decimal places:

enter image description here

and get a more precise result:

enter image description here

answered Nov 21 at 16:58

cybernetic.nomad

1,134111

Found it:

The problem is the equation has some rounding in it. If you right-click on it and select Format trendline label:

enter image description here

You can add decimal places:

enter image description here

and get a more precise result:

enter image description here

answered Nov 21 at 16:58

cybernetic.nomad

1,134111

answered Nov 21 at 16:58

cybernetic.nomad

1,134111

answered Nov 21 at 16:58

cybernetic.nomad

1,134111

answered Nov 21 at 16:58

cybernetic.nomad

1,134111

You are a genius!
– Rick
Nov 22 at 1:22

add a comment |

You are a genius!
– Rick
Nov 22 at 1:22

You are a genius!
– Rick
Nov 22 at 1:22

add a comment |

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