Why does Desmos give a different exponential regression than my TI 84 and my Calculus text?
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I obtained this data from a calculus text (Stewart's Single Variable Calculus, Early Transcendentals, 2nd Ed.). The text and my TI 84 graphing calculator both give similar values for $a$ and $b$ ($0.00807079266$ and $1.013731$, respectively).
Below is my result from Desmos. What magic is it working? Why might it be so different? The regression line in the textbook also looks much better.
Am I handling Desmos correctly?
calculator regression-analysis
asked Jan 28 '17 at 22:52
Adam Hrankowski
1,998825
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up vote
2
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I obtained this data from a calculus text (Stewart's Single Variable Calculus, Early Transcendentals, 2nd Ed.). The text and my TI 84 graphing calculator both give similar values for $a$ and $b$ ($0.00807079266$ and $1.013731$, respectively).
Below is my result from Desmos. What magic is it working? Why might it be so different? The regression line in the textbook also looks much better.
Am I handling Desmos correctly?
calculator regression-analysis
asked Jan 28 '17 at 22:52
Adam Hrankowski
1,998825
1
My GeoGebra agrees with your calculator and text, except that it makes $a$ like a million times smaller (same digits, only with a lot more (I didn't count) zeroes in front).
– Arthur
Jan 28 '17 at 22:59
Yes, my TI 84 does the same. I neglected to mention this as it didn't worry me. The population figures are in millions.
– Adam Hrankowski
Jan 28 '17 at 23:02
1
Problem solved: I enabled log mode. (Note the unchecked box in the sample illustration.) This puts the figures in line with the other calculators. The desmos site explains: support.desmos.com/hc/en-us/articles/204349605
– Adam Hrankowski
Jan 28 '17 at 23:37
1
@AdamHrankowski Could you please convert your comment into an answer so this question can be removed from the "Unanswered" queue? Answering one's own question can feel odd, but since you solved your own problem, it seems like the best course of action here.
– Robert Howard
Nov 25 at 3:06
add a comment |
up vote
2
down vote
favorite
up vote
2
down vote
favorite
I obtained this data from a calculus text (Stewart's Single Variable Calculus, Early Transcendentals, 2nd Ed.). The text and my TI 84 graphing calculator both give similar values for $a$ and $b$ ($0.00807079266$ and $1.013731$, respectively).
Below is my result from Desmos. What magic is it working? Why might it be so different? The regression line in the textbook also looks much better.
Am I handling Desmos correctly?
calculator regression-analysis
asked Jan 28 '17 at 22:52
Adam Hrankowski
1,998825
I obtained this data from a calculus text (Stewart's Single Variable Calculus, Early Transcendentals, 2nd Ed.). The text and my TI 84 graphing calculator both give similar values for $a$ and $b$ ($0.00807079266$ and $1.013731$, respectively).
Below is my result from Desmos. What magic is it working? Why might it be so different? The regression line in the textbook also looks much better.
Am I handling Desmos correctly?
calculator regression-analysis
calculator regression-analysis
asked Jan 28 '17 at 22:52
Adam Hrankowski
1,998825
asked Jan 28 '17 at 22:52
Adam Hrankowski
1,998825
asked Jan 28 '17 at 22:52
Adam Hrankowski
1,998825
asked Jan 28 '17 at 22:52
Adam Hrankowski
1,998825
asked Jan 28 '17 at 22:52
Adam Hrankowski
1,998825
1,998825
1
My GeoGebra agrees with your calculator and text, except that it makes $a$ like a million times smaller (same digits, only with a lot more (I didn't count) zeroes in front).
– Arthur
Jan 28 '17 at 22:59
Yes, my TI 84 does the same. I neglected to mention this as it didn't worry me. The population figures are in millions.
– Adam Hrankowski
Jan 28 '17 at 23:02
1
Problem solved: I enabled log mode. (Note the unchecked box in the sample illustration.) This puts the figures in line with the other calculators. The desmos site explains: support.desmos.com/hc/en-us/articles/204349605
– Adam Hrankowski
Jan 28 '17 at 23:37
1
@AdamHrankowski Could you please convert your comment into an answer so this question can be removed from the "Unanswered" queue? Answering one's own question can feel odd, but since you solved your own problem, it seems like the best course of action here.
– Robert Howard
Nov 25 at 3:06
add a comment |
1
My GeoGebra agrees with your calculator and text, except that it makes $a$ like a million times smaller (same digits, only with a lot more (I didn't count) zeroes in front).
– Arthur
Jan 28 '17 at 22:59
Yes, my TI 84 does the same. I neglected to mention this as it didn't worry me. The population figures are in millions.
– Adam Hrankowski
Jan 28 '17 at 23:02
1
Problem solved: I enabled log mode. (Note the unchecked box in the sample illustration.) This puts the figures in line with the other calculators. The desmos site explains: support.desmos.com/hc/en-us/articles/204349605
– Adam Hrankowski
Jan 28 '17 at 23:37
1
@AdamHrankowski Could you please convert your comment into an answer so this question can be removed from the "Unanswered" queue? Answering one's own question can feel odd, but since you solved your own problem, it seems like the best course of action here.
– Robert Howard
Nov 25 at 3:06
1
1
My GeoGebra agrees with your calculator and text, except that it makes $a$ like a million times smaller (same digits, only with a lot more (I didn't count) zeroes in front).
– Arthur
Jan 28 '17 at 22:59
My GeoGebra agrees with your calculator and text, except that it makes $a$ like a million times smaller (same digits, only with a lot more (I didn't count) zeroes in front).
– Arthur
Jan 28 '17 at 22:59
Yes, my TI 84 does the same. I neglected to mention this as it didn't worry me. The population figures are in millions.
– Adam Hrankowski
Jan 28 '17 at 23:02
Yes, my TI 84 does the same. I neglected to mention this as it didn't worry me. The population figures are in millions.
– Adam Hrankowski
Jan 28 '17 at 23:02
1
1
Problem solved: I enabled log mode. (Note the unchecked box in the sample illustration.) This puts the figures in line with the other calculators. The desmos site explains: support.desmos.com/hc/en-us/articles/204349605
– Adam Hrankowski
Jan 28 '17 at 23:37
Problem solved: I enabled log mode. (Note the unchecked box in the sample illustration.) This puts the figures in line with the other calculators. The desmos site explains: support.desmos.com/hc/en-us/articles/204349605
– Adam Hrankowski
Jan 28 '17 at 23:37
1
1
@AdamHrankowski Could you please convert your comment into an answer so this question can be removed from the "Unanswered" queue? Answering one's own question can feel odd, but since you solved your own problem, it seems like the best course of action here.
– Robert Howard
Nov 25 at 3:06
@AdamHrankowski Could you please convert your comment into an answer so this question can be removed from the "Unanswered" queue? Answering one's own question can feel odd, but since you solved your own problem, it seems like the best course of action here.
– Robert Howard
Nov 25 at 3:06
add a comment |
1 Answer
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Problem solved: I enabled log mode. (Note the unchecked box in the sample illustration.) This puts the figures in line with the other calculators. The desmos site explains: support.desmos.com/hc/en-us/articles/204349605
answered Nov 26 at 4:23
Adam Hrankowski
1,998825
add a comment |
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1 Answer
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oldest
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active
oldest
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up vote
1
down vote
accepted
Problem solved: I enabled log mode. (Note the unchecked box in the sample illustration.) This puts the figures in line with the other calculators. The desmos site explains: support.desmos.com/hc/en-us/articles/204349605
answered Nov 26 at 4:23
Adam Hrankowski
1,998825
add a comment |
up vote
1
down vote
accepted
Problem solved: I enabled log mode. (Note the unchecked box in the sample illustration.) This puts the figures in line with the other calculators. The desmos site explains: support.desmos.com/hc/en-us/articles/204349605
answered Nov 26 at 4:23
Adam Hrankowski
1,998825
add a comment |
up vote
1
down vote
accepted
up vote
1
down vote
accepted
Problem solved: I enabled log mode. (Note the unchecked box in the sample illustration.) This puts the figures in line with the other calculators. The desmos site explains: support.desmos.com/hc/en-us/articles/204349605
answered Nov 26 at 4:23
Adam Hrankowski
1,998825
Problem solved: I enabled log mode. (Note the unchecked box in the sample illustration.) This puts the figures in line with the other calculators. The desmos site explains: support.desmos.com/hc/en-us/articles/204349605
answered Nov 26 at 4:23
Adam Hrankowski
1,998825
answered Nov 26 at 4:23
Adam Hrankowski
1,998825
answered Nov 26 at 4:23
Adam Hrankowski
1,998825
answered Nov 26 at 4:23
Adam Hrankowski
1,998825
1,998825
add a comment |
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1
My GeoGebra agrees with your calculator and text, except that it makes $a$ like a million times smaller (same digits, only with a lot more (I didn't count) zeroes in front).
– Arthur
Jan 28 '17 at 22:59
Yes, my TI 84 does the same. I neglected to mention this as it didn't worry me. The population figures are in millions.
– Adam Hrankowski
Jan 28 '17 at 23:02
1
Problem solved: I enabled log mode. (Note the unchecked box in the sample illustration.) This puts the figures in line with the other calculators. The desmos site explains: support.desmos.com/hc/en-us/articles/204349605
– Adam Hrankowski
Jan 28 '17 at 23:37
1
@AdamHrankowski Could you please convert your comment into an answer so this question can be removed from the "Unanswered" queue? Answering one's own question can feel odd, but since you solved your own problem, it seems like the best course of action here.
– Robert Howard
Nov 25 at 3:06