## 1.3 Odds Daily

Posted : admin On 08.03.2021Staking #10,000 daily on our 5 odds means you're spending a total of #70,000 a week on the 5 odds games. With a guaranteed 5 wins a week means at the end of the week #250,000 would be left on the account. Your Profit for a week on the 5 odds stake would be (#250,000 - #70,000) #180,000. Calculating total payout: Odds x Stake = total payout e.g. 9.0 x $10 = $90 To calculate profit: (Odds x Stake) – Stake = profit e.g. (9.0 x $10) – $10 =$80; Comparing different types of odds. Whichever format odds are written in, they all have an equivalent in another format.

This most likely means '500 to 1 Odds are against winning' which is exactly the same as '1 to 500 Odds are for winning.' Probability Formulas: This calculator will convert 'odds of winning' for an event into a probability percentage chance of success. £30 Bet £10 Get £30 in Free Bets + £10 Casino Bonus. Min deposit £10. A qualifying bet is a ‘real money’ stake of at least £10. Min odds 1/2 (1.5). Free Bets credited upon qualifying bet settlement and expires after 7 days. Free Bet stakes not included in returns. Deposit balance is available for withdrawal at any time. Casino Bonus must be claimed within 7 days. Positive Figures (+): The odds state the winnings on a $100 bet. Ex: American odds of +120 would win $120 on a $100 bet. Negative Figures (-): The odds indicate how much must be bet to win $100 profit. Ex: American odds of -120 would win $100 on a $120 bet. Decimals quote the potential return should the bet succeed, relative to.

## Calculator Use

Convert stated odds to a decimal value of probability and a percentage value of winning and losing. This calculator will convert 'odds for winning' an event or 'odds against winning' an event into percentage chances of both winning and losing.

Be careful if you are using sports teams odds or betting odds. If you see that the Patriots super bowl odds are 9/2, that is most likely 'odds against' and should be entered in the calculator with 'Odds are: against winning.'

When playing a lottery or other games of chance be sure you understand the odds or probability that is reported by the game organizer. A 1 in 500 chance of winning, or probability of winning, is entered into this calculator as '1 to 500 Odds are for winning'. You may also see odds reported simply as chance of winning as 500:1. This most likely means '500 to 1 Odds are against winning' which is exactly the same as '1 to 500 Odds are for winning.'

## Probability Formulas:

This calculator will convert 'odds of winning' for an event into a probability percentage chance of success.

Odds, are given as (chances for success) : (chances against success) or vice versa.

If odds are stated as an A to B chance of winning then the probability **of winning** is given as P_{W} = A / (A + B) while the probability **of losing** is given as P_{L} = B / (A + B).

For example, you win a game if you pull an ace out of a full deck of 52 cards. Pulling any other card you lose. The chance of winning is 4 out of 52, while the chance against winning is 48 out of 52 (52-4=48). Entering A=4 and B=48 into the calculator as 4:48 odds are for winning you get

For **4 to 48 odds** for winning;

Probability of:

Winning = (0.0769) or **7.6923%**

Losing = (0.9231) or **92.3077%**

'Odds for' winning:** 1:12 **(reduced from 4:48)

'Odds against' winning:** 12:1 ** (reduced from 48:4)

## Further Reading

### How To Get 1.3 Odds Daily

Written by Clay Smith

## Idiot’s Guide

That’s right - I will be your guide. The good thing about having an idiot for a guide is that I have to make it simple to understand it myself, which means, hopefully, you will understand it as well.

## Probability or Odds

**Probability**Probability means the risk of an event happening divided by the total number of people at risk of having that event. I will use the example in a recent JAMA article. In a deck of 52 cards, there are 13 spades. So, the risk (or probability) of drawing a card randomly from the deck and getting spades is 13/52 = 0.25 = 25%. The numerator is the number of spades, and the denominator is the total number of cards.

**Odds**

Odds seems less intuitive. It is the ratio of the probability a thing will happen over the probability it won’t. In the spades example, the probability of drawing a spade is 0.25. The probability of not drawing a spade is 1 - 0.25. So the odds is 0.25/0.75 or 1:3 (or 0.33 or 1/3 pronounced 1 to 3 odds).

**Moving back and forth**

To go from odds to probability, simply take the numerator/(denominator + numerator). In the spades example, the odds of 1/3 is converted by taking 1/1+3 = 0.25 - and now we are back to probability. To go from probability to odds, simply take the numerator/(denominator-numerator). In the spades example, given that the probability of drawing a spade is 1/4, take 1/(4-1) = 1:3 odds or odds = 0.33.

**Statistical Significance**

If an odds ratio (OR) is 1, it means there is no association between the exposure and outcome. So, if the 95% confidence interval for an OR includes 1, it means the results are not statistically significant. Example, exposure to colored vs white Christmas lights was associated with an increase in jocularity score, OR = 1.2 (95%CI 0.98-1.45). Sorry, this is not statistically significant. Let’s just go with white lights…

**Use**

Either the OR or risk ratio (RR) could be used in many study types. However, only the OR can be used in case-control studies. Because in order to calculate the RR, one must know the risk. Risk is a probability, a proportion of those exposed with an outcome compared to the total population exposed. This is impossible in a case-control study, in which those who already have the outcome are included without knowing the total population exposed.

## Risk Ratio

RR is a very intuitive concept. It is the probability (or risk) of one outcome over the probability (risk) of another. Let’s use a study we covered on JF to discuss this concept. Survival was lower in pediatric patients intubated during arrest compared with those not intubated: 411/1135 (36%) vs 460/1135 (41%). So, the RR is 36.2%/40.5% = **0.89**. This means survival was reduced by a factor of 0.89 for pediatric arrest patients who were intubated during arrest vs. those who were not. As an example, if survival was expected to be 40%, then intubating during arrest would reduce it to: 40% x 0.89 = 35.6%.

Let’s do one more example. Supination-flexion (SF) vs hyperpronation (HP) to reduce nursemaid’s elbow was more likely to fail. The risk of failure with SF was 96/351 (27%) vs. 32/350 (9%) with HP. The RR was **3**. This has a very intuitive meaning: risk of failure with SF was three times more likely than HP.

## Odds Ratio

The OR is a way to present the strength of association between risk factors/exposures and outcomes. If the OR is <1, odds are decreased for an outcome; OR >1 means the odds are increased for a given outcome. Let’s look at the examples again and consider odds.

For pediatric arrest, the risk of survival if intubated during arrest was 411/1135 (36%) vs 460/1135 (41%) if not intubated. Let’s convert to odds and calculate an OR.

Intubated: 411/1135-411 = 411/724 = 0.57 odds.

Non-intubated: 460/1135-460 = 460/675 = 0.68 odds.

So, the OR is 0.57/0.68 =

**0.83**.

Note, this is very close to the RR (**0.89**) but is a slight overestimate of the effect on the outcome. This is always the case with the OR compared to the RR - it overestimates the effect.

Take the example of supination-flexion vs hyperpronation for nursemaid’s. The risk of failure for SF was 96/351 vs. 32/350 with HP. Let’s convert this to odds.

SF: 96/351-96 = 0.376 odds

HP: 32/350-32 = 0.10 odds

The OR is 0.376/0.10 =

**3.7**

Note, the OR overestimates the RR, which was 3. Although one could say the risk of failure using SF is 3 times greater than HP, one could not say, based on the OR, the *risk* was 3.74 times greater. The *OR and RR are not the same*. What could be said is that the *odds* of failure is 3.74 times greater.

## Risk Ratio vs Odds Ratio

Whereas RR can be interpreted in a straightforward way, OR can not. A RR of 3 means the risk of an outcome is increased threefold. A RR of 0.5 means the risk is cut in half. But an OR of 3 doesn’t mean the *risk* is threefold; rather the *odds* is threefold greater. Interpretation of an OR must be in terms of odds, not probability. Again, the OR will always be an overestimate compared to the RR. However, the RR and OR will be similar for rare outcomes, <10%. But the OR increasingly overestimates RR as outcomes exceed 10%. This is easier to understand with an example.

Pretend a new vape, Vapalicious, is associated with cancer.

80/100 people who use it get cancer.

20/100 who don’t use it get cancer.

The risk of getting cancer is 4 times greater in Vapalicious users. RR = 0.8/0.2 = 4

Note how distorted the OR becomes in this example. OR = (80/20)/(20/80) = 16

What if Vapalicious rarely caused cancer?

5/1000 get cancer with Vapalicious vs 2.5/1000 for non-users.

RR = 2.

OR = 2 as well (actually 2.005)

With rare outcomes, the RR and OR are

*very*similar.

## Why Does This Matter?

This matters because we often equate the OR and RR. Unwary researchers, reviewers, or news media might report a 16-fold increased risk of cancer from Vapalicious. In fact, there was a 4-fold increased risk of cancer from Vapalicous. Not that I plan to use Vapalicious (or any other vape), but a 16-fold vs 4-fold increase is a gross overestimation of the effect.

### 1.3 Odds Daily Tips

## What Does the OR Mean?

So, what does an OR mean? Here it is in plain language.

An OR of 1.2 means there is a 20% increase in the odds of an outcome with a given exposure.

An OR of 2 means there is a 100% increase in the odds of an outcome with a given exposure. Or this could be stated that there is a doubling of the

*odds*of the outcome. Note, this is not the same as saying a doubling of the*risk*.An OR of 0.2 means there is an 80% decrease in the odds of an outcome with a given exposure.

## Summary

Odds Ratio is a measure of the strength of association with an exposure and an outcome.

OR > 1 means greater odds of association with the exposure and outcome.

OR = 1 means there is no association between exposure and outcome.

OR < 1 means there is a lower odds of association between the exposure and outcome.

If the 95% confidence interval for the OR includes 1, the results are not statistically significant.

OR and RR are not the same.

OR always overestimate RR, but…

OR approximates RR when the outcome is rare but markedly overestimates it as outcome exceeds 10%.

## References

### Free 1.3 Odds Daily

The odds ratio by Bland and Altman, of Bland-Altman plot fame

Wikipedia aka source of all statistical knowledge