Which roc to use

ROC curves were first employed in the study of discriminator systems for the detection of radio signals in the presence of noise in the s, following the attack on Pearl Harbor. Now ROC curves are frequently used to show the connection between clinical sensitivity and specificity for every possible cut-off for a test or a combination of tests. In addition, the area under the ROC curve gives an idea about the benefit of using the test s in question. To make an ROC curve you have to be familiar with the concepts of true positive, true negative, false positive and false negative.

These concepts are used when you compare the results of a test with the clinical truth, which is established by the use of diagnostic procedures not involving the test in question. The cut-off determines the clinical sensitivity fraction of true positives to all with disease and specificity fraction of true negatives to all without disease. When you change the cut-off, you will get other values for true positives and negatives and false positives and negatives, but the number of all with disease is the same and so is the number of all without disease.

Thus you will get an increase in sensitivity or specificity at the expense of lowering the other parameter when you change the cut-off [1]. I and FIG. II demonstrate the trade-off between sensitivity and specificity. An ROC curve shows the relationship between clinical sensitivity and specificity for every possible cut-off.

The ROC curve is a graph with:. Thus every point on the ROC curve represents a chosen cut-off even though you cannot see this cut-off. What you can see is the true positive fraction and the false positive fraction that you will get when you choose this cut-off. To make an ROC curve from your data you start by ranking all the values and linking each value to the diagnosis — sick or healthy.

The results and the diagnosis sick Y or N are listed and ranked based on parameter concentration. For each and every concentration it is calculated what the clinical sensitivity true positive rate and the 1 — specificity false positive rate of the assay will be if a result identical to this value or above is considered positive.

The result is vibrant and healthier-looking skin. Read More. Apply to face and neck at night when skin is most receptive for repair and renewal. Begin applying this product every other night and then gradually increase frequency to every night.

Apply a sunscreen of SPF15 or higher during the day while using this product. Thanks for subscribing! Close search. They greatly faded on their own, but not gone yet. I hope the great results continue and as I use up my other products, I plan to try their exfoliating cleanser, deep wrinkle serum for forehead and night cream.

I hope my results continue to be amazing and that if I try any other of their products that I am as pleased or more so, as I am with their sensitive eye cream. Definitely, the best OTC product that I have tried so far out of 3 brands. I feel lucky to have possibly stuck GOLD on my 3rd try. I have used Roc for 20 years and have enjoyed compliments on my skin since then.

I am a non smoker and come from a family of good genetics. Roc has stopped the aging clock as far as my skin is concerned. It has reduced skin blotches sun damage and minimized any fine lines that are a normal part of the aging process.

It is not expensive when compared to most skin care products. My great aunt is the person I thank for passing on this product to me when I was still quite young.

I guess buying a face cream is chancing Every skin and personal circumstances are different. Unfortunately even 1 buy from each of us is enough to make cosmetic giants rich. Retinol and the traditional wax do not mix well. Waxing professionals should use a different type of wax if you are using Retinol based products.

Should I introduce the ROC serum into my regimen to help diminish my dark spots? You can get Roc products on Ebay pretty cheap. Much cheaper than the drugstore. I recommend a Roc eye cream. I was using a Roc product on my face and on my eyes. It was too strong for my eyes. It comes in a small white tube with gold top. It lasts a long time. You just need a tiny bit. You need something more sensitive for those areas, esp the upper eyelid.

I hope you like it. My skin is tight. You should like it and have good results. Another thought. Aloe vera gel is very healing and hydrating. You may want to use that too. Best wishes.

You can get it at any drug store and at some Dollar stores. Roc customers are very devoted to their products. Hi I have heard so much about roc anti wrinkle night cream. I live in south africa kzn ladysmith. Thank you. Please help me, I have an M1 allergy and need to know the ingredients of your products before purchasing. I would like to speak to somebody, by e mail if possible.

I believe this product can come by several other names. And do your products contain parabans? I need a day cream, a night cream and a sun protection product. Waxing always takes off a layer of skin though. No…not true…in fact quite the opposite…Retinol should increase the thickness of skin…Prednisone, Hydrocortisone creams will thin the skin…perhaps that is what she meant?

My initial reaction is that the technique of the aesthetician is to blame for your skin peeling. I had my brows waxed and some skin peeled off. The esthetician said it was possibly because I use retinol products and they thin the skin.

Could this be true? I use the night cream and the SPF 30 day cream, and let me tell you — best product ever. It completely resurfaces your skin and makes your pores look invisible!

It also completely clears my acne. I have extremely sensitive skin and when I use this stuff, it seems to make my skin a lot less sensitive and able to handle other chemicals like hair spray, other lotions, etc.

If you have freckles though, make sure you stay OUT of the sun because ONE downside to using retinol is that although it corrects sun damage, it makes your skin much more prone to new sun damage at the same time! I have two new freckles that are literally black colored… have never experienced that before!

But now that I am more careful about the sun when using this product, they are fading slowly, thankfully. I belive in eating healthy and lots of copper will keep wrinkles at bay and sunscreen and exfoliation,but eating well is the key to youth!

Roc retinol correxion serum will not help acne serums. I recommend it if you have fine lines and wrinkles. It will smooth out smaller fine lines within a few days but you need to use it everyday.

Once you stop the lines come back but least it works. I have been using this product for about a month now and I have not seen any improvement in my skin. Apparently this is a mild version of the original and has half the retinol as the original Roc Retinol Correxion. The product is affordable so I do not feel as though I have been ripped off but if I could see some visible difference I would continue using this product indefinitely. I LOVE this product! It ralley takes the years off!

I am 46 and, I have people tell me that I look like I am I have been using it for about a year and, love the results. It ralley does get rid of the wrinkles and, makes your skin luminous. It even seems to help ease breakouts. You may notice a slight tingling when you first start using it, make sure you use sunscreen with this product. I have used far more expensive products and, found this to work better for far less money.

I would highly recommend this product as well as any other of the ROC products. I love this stuff. I used Roc Retinol Correxion Cream on my face after being recommended to use it by a friend who works in the beauty industry. It does cause your face to peel but it will make your skin look a lot younger if you use it continuously. All products have the potential to cause allergies, especially retinol based skin care products.

I had low expectations about Roc Retinol Correxion cream due to the low cost of this item but it seems to work and now I use the day and night cream everyday but I need to use my own spf sunscreen as I have very sensitive skin. I cannot rave enough about Roc Retinol Correxion Serum. This product smells sweet compared with other retinol products and it works. In my opinion, anybody who cares about their skin will use a retinol serum and Roc makes the best one.

Hey there! Do you use Twitter? Roc Retinol is exceeding my expectations! I have oily skin and most moisturizers cause me to breakout or for my skin to look shiny. Roc Retinol Cream is hands down the best retinol product I have ever tried. It even beats the product the dermatology dispenses in her clinic. It helps with spots and takes away all the damage the sun has caused and believe me I had a lot of sun damage.