Why is my LOF algorithm producing the opposite result it should?Outlier detection by unsupervised algorithm: Fraud DetectionOutlier detection: Should the metric used in kNN take into account variance explained by each coordinate?Classification based on a Clustering ResultMultivariate outlier detection with isolation forest..How to detect most effective features?What do you call an anomaly/signature detection algorithm in data scienceDo anomalous input features to autoencoder result in high errors on the corresponding output features?Spectral clustering result interpretationWhy is Local Outlier Factor classified as Unsupervised if it requires training data with no outliers?DONUT- Anomaly detection Algorithm ignores the relationship between sliding windows?Algorithm suggestion for anomaly detection in multivariate time series data
Phrase for the opposite of "foolproof"
What is the strongest case that can be made in favour of the UK regaining some control over fishing policy after Brexit?
Will tsunami waves travel forever if there was no land?
Can I get candy for a Pokemon I haven't caught yet?
Pawn Sacrifice Justification
Examples of non trivial equivalence relations , I mean equivalence relations without the expression " same ... as" in their definition?
Why do computer-science majors learn calculus?
What is a Recurrent Neural Network?
If Earth is tilted, why is Polaris always above the same spot?
How to determine the actual or "true" resolution of a digital photograph?
Upright [...] in italics quotation
Past Perfect Tense
Has any spacecraft ever had the ability to directly communicate with civilian air traffic control?
Toggle Overlays shortcut?
How can Republicans who favour free markets, consistently express anger when they don't like the outcome of that choice?
What are the spoon bit of a spoon and fork bit of a fork called?
What is the difference between `a[bc]d` (brackets) and `ab,cd` (braces)?
Are Boeing 737-800’s grounded?
Unexpected email from Yorkshire Bank
How deep to place a deadman anchor for a slackline?
When and why did journal article titles become descriptive, rather than creatively allusive?
Illegal assignment from SObject to Contact
Did Henry V’s archers at Agincourt fight with no pants / breeches on because of dysentery?
gnu parallel how to use with ffmpeg
Why is my LOF algorithm producing the opposite result it should?
Outlier detection by unsupervised algorithm: Fraud DetectionOutlier detection: Should the metric used in kNN take into account variance explained by each coordinate?Classification based on a Clustering ResultMultivariate outlier detection with isolation forest..How to detect most effective features?What do you call an anomaly/signature detection algorithm in data scienceDo anomalous input features to autoencoder result in high errors on the corresponding output features?Spectral clustering result interpretationWhy is Local Outlier Factor classified as Unsupervised if it requires training data with no outliers?DONUT- Anomaly detection Algorithm ignores the relationship between sliding windows?Algorithm suggestion for anomaly detection in multivariate time series data
$begingroup$
What could cause the local outlier factor (LOF) to output below 1.0 for outliers and above 1.0 for inliers? I have my code sort of working just by inverting the output, but I can't figure out what's wrong with my algorithm. I'm following the one Wikipedia lists to the letter, but for some reason, it's producing the opposite result.
On a high, non-code-specific level, does anyone know what could cause the algorithm to behave like this? I've looked everywhere in the code, and to the best of my knowledge, it's doing exactly what this describes.
clustering anomaly-detection outlier
asked Apr 8 at 2:16
ZayaZaya
101
$endgroup$
add a comment |
$begingroup$
What could cause the local outlier factor (LOF) to output below 1.0 for outliers and above 1.0 for inliers? I have my code sort of working just by inverting the output, but I can't figure out what's wrong with my algorithm. I'm following the one Wikipedia lists to the letter, but for some reason, it's producing the opposite result.
On a high, non-code-specific level, does anyone know what could cause the algorithm to behave like this? I've looked everywhere in the code, and to the best of my knowledge, it's doing exactly what this describes.
clustering anomaly-detection outlier
asked Apr 8 at 2:16
ZayaZaya
101
$endgroup$
2
$begingroup$
Maybe you overlooked the 1/ ? Also, don't rely on Wikipedia, in particular when something is not working, then consult the original works instead...
$endgroup$
– Anony-Mousse
Apr 8 at 5:36
add a comment |
$begingroup$
What could cause the local outlier factor (LOF) to output below 1.0 for outliers and above 1.0 for inliers? I have my code sort of working just by inverting the output, but I can't figure out what's wrong with my algorithm. I'm following the one Wikipedia lists to the letter, but for some reason, it's producing the opposite result.
On a high, non-code-specific level, does anyone know what could cause the algorithm to behave like this? I've looked everywhere in the code, and to the best of my knowledge, it's doing exactly what this describes.
clustering anomaly-detection outlier
asked Apr 8 at 2:16
ZayaZaya
101
$endgroup$
What could cause the local outlier factor (LOF) to output below 1.0 for outliers and above 1.0 for inliers? I have my code sort of working just by inverting the output, but I can't figure out what's wrong with my algorithm. I'm following the one Wikipedia lists to the letter, but for some reason, it's producing the opposite result.
On a high, non-code-specific level, does anyone know what could cause the algorithm to behave like this? I've looked everywhere in the code, and to the best of my knowledge, it's doing exactly what this describes.
clustering anomaly-detection outlier
clustering anomaly-detection outlier
asked Apr 8 at 2:16
ZayaZaya
101
asked Apr 8 at 2:16
ZayaZaya
101
asked Apr 8 at 2:16
ZayaZaya
101
asked Apr 8 at 2:16
ZayaZaya
101
asked Apr 8 at 2:16
ZayaZaya
101
101
2
$begingroup$
Maybe you overlooked the 1/ ? Also, don't rely on Wikipedia, in particular when something is not working, then consult the original works instead...
$endgroup$
– Anony-Mousse
Apr 8 at 5:36
add a comment |
2
$begingroup$
Maybe you overlooked the 1/ ? Also, don't rely on Wikipedia, in particular when something is not working, then consult the original works instead...
$endgroup$
– Anony-Mousse
Apr 8 at 5:36
2
2
$begingroup$
Maybe you overlooked the 1/ ? Also, don't rely on Wikipedia, in particular when something is not working, then consult the original works instead...
$endgroup$
– Anony-Mousse
Apr 8 at 5:36
$begingroup$
Maybe you overlooked the 1/ ? Also, don't rely on Wikipedia, in particular when something is not working, then consult the original works instead...
$endgroup$
– Anony-Mousse
Apr 8 at 5:36
add a comment |
0
active
oldest
votes
Your Answer
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "557"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);
else
createEditor();
);
function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);
);
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fdatascience.stackexchange.com%2fquestions%2f48845%2fwhy-is-my-lof-algorithm-producing-the-opposite-result-it-should%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
0
active
oldest
votes
0
active
oldest
votes
active
oldest
votes
active
oldest
votes
Thanks for contributing an answer to Data Science Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
Use MathJax to format equations. MathJax reference.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fdatascience.stackexchange.com%2fquestions%2f48845%2fwhy-is-my-lof-algorithm-producing-the-opposite-result-it-should%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
2
$begingroup$
Maybe you overlooked the 1/ ? Also, don't rely on Wikipedia, in particular when something is not working, then consult the original works instead...
$endgroup$
– Anony-Mousse
Apr 8 at 5:36